The post elaborately expleian how to buil a simple LED bulb using many LEDs in series and powering them through a capacitive power supply circuit
Why use LEDs
- LEDs are being Incorporated in vast magnitudes today for everything that may involve lights and illuminations.
- White LEDs have especially become very popular due to their mini size, dramatic illuminating capabilities and high efficiency with power consumptions. In one of my earlier post I discussed how to make a super simple LED tube light circuit, here the concept is quite similar but the product is a bit different with its specs.
- Here we are discussing the making of a simple LED bulb CIRCUIT DIAGRAM, By the word "bulb" we mean the shape of the unit and the fitting secs will be similar to that of an ordinary incandescent bulb, but actually the whole body of the "bulb" would involve discrete LEDs fitted in rows over a cylindrical housing.
- The cylindrical housing ensures proper and equal distribution of the generated illumination across the entire 360 degrees so that the entire premise is equally illuminated. The image below explains how the LEDs needs to be installed over the proposed housing.
Image credit: https://www.sharplumi.com/en/userfiles/20100913191605380.jpg Circuit Description The circuit of a LED bulb explained here is very easy to build and the circuit is very reliable and long lasting.
The reasonably smart surge protection feature included in the circuit ensures an ideal shielding of the unit from all electrical power ON surges.
How the Circuit Functions
- The diagram shows a single long series of LEDs connected one behind the other to form a long LED chain.
- To be precise we see that basically 40 LEDs have been used which are connected in series. Actually for a 220V input, you could probably invorporate around 90 LEDs in series, and for 120V input around 45 would suffice.
- These figures are obtained by dividing the rectified 310V DC (from 220V AC) by the forward voltage of the LED.
- Therefore, 310/3.3 = 93 numbers, and for 120V inputs it's calculated as 150/3,3 = 45 numbers. Remember as we go on reducing the number of LEDs below these figures, the risk of switch ON surge increases proportionately, and vice versa.
- The power supply circuit used for powering this array is derived from a high voltage capacitor, whose low reactance is exploited for stepping down the high current input to a lower current suitable for the circuit.
- The two resistors and a capacitor at the at the positive supply are positioned for suppressing the initial power ON surge and other fluctuations during voltage fluctuations. In fact the real surge correction is done by C2 introduced after the bridge (in between R2 and R3).
- All instantaneous voltage surges are effectively sunk by this capacitor, providing a clean and safe voltage to the integrated LEDs at the next stage of the circuit.
CAUTION: THE CIRCUIT SHOWN BELOW IS NOT ISOLATED FROM THE AC MAINS, THEREFORE IS EXTREMELY DANGEROUS TO TOUCH IN POWERED POSITION.
Parts List
R1 = 1M 1/4 watt
R2, R3 = 100 Ohms 1watt,
C1 = 474/400V or 0.5uF/400V PPC
C2, C3 = 4.7uF/250V
D1---D4 = 1N4007
All LEDs = white 5mm straw-hat type input = 220/120V mains...
The above LED bulb lacks a genuine surge protection feature and therefore could be severely prone to damage in the long run....in order to safeguard and guarantee the design against all sorts of surge and transients, you can refer to the following concepts and implement any one of these in the above simple design:
Using an NTC Thermistor as a Surge Suppressor
Zero Crossing Controlled Surge Free Transformerless Power Supply
SCR Shunt for Protecting Capacitive LED Driver Circuits High Power Zener Diode Circuit
The LEDs in the above discussed LED bulb circuit can be also protected and their life increased by adding a zener diode across the supply lines as shown in the following image.
The zener value shown is 310V/2 watt, and is suitable if the LED bulb includes around 93 to 96V LEDs. For other lower number of LED strings, simply reduce the zener value as per the total forward voltage calculation of the LED string.
For example if a 50 LED string is used, multiply 50 with the forward drop of each LED that is 3.3 V which gives 50 x 3.3 = 165V, therefore a 170V zener will keep the LED well protected from any sort of voltage surge or fluctuations....and so on
Video clip showing an LED circuit circuit using 108 numbers of LED (two 54 LED series strings connected in parallel)
Simple LED Bulb using 1 watt LEDs.
A simple high power LED bulb can be built using 3 or 4 1 watt LEDs in series, although the LeDs would be operated only at their 30% capacity, still the illumination will amazingly high compared to the ordinary 20mA/5mm LEDs.
Moreover you won't require a heatsink for the LEDs since these are being operated at only 30% of their actual capacity.
Circuit Diagram:
Video Clip:
Simple LED Lamp for Home Decor, Made by Using Ordinary LEDs, Powered by a 12V AC/DC Adapter:The following images were sent to me by one of the keen followers of this blog Mr.Ishaan Pathania. The shown prototype of a simple LED lamp was built and tested successfully by him:
charmi says
Hello,
I need to build led driver .Please help me for the circuit to make it.Is it possible to make led driver with both possibile input AC/DC?
1
INPUT VOLATAGE RANGE
70-140 VDC / VAC
2
OUTPUT VOLTAGE
15 VDC
3
OUTPUT CURRENT 1
3 Amp
4
OUTPUT CURRENT 2 (WITH DIMMING FUNCTION)
2.5 Amp
5
SURGE PROTECTION
1.8KV, 1.2/50 µsec
6
WORKING TEMP
0°C to 85°C
7
PROTECTION :
Short circuit
7.1
open circuit
7.2
reverse polarity input
7.3
over voltage
7.4
under voltage
7.5
EMI / EMC PROOF
8
OUTPUT WATTAGE
15VDC X 3 AMP = 45W
Swag says
Sorry I do not have a 3 amp SMPS circuit with me at the moment, I would rather suggest you to buy one ready made and reverse engineer it and identify its full construction details
Rishabh says
Sir, some of my LEDs are not glowing. Could you please tell me what can be the reason for this.
Swag says
Rishabh, it could be either the LEDs are of bad quality and therefore not illuminating or they are burnt due to surge current….please use a zener diode as suggested in the last circuit, and also an NTC if pssible
C Ravi says
Dear Sir,
Could you please tell value of inductor coil used in Philips 5 watts led bulb (which is burnt due to power fluctuation)
Swagatam says
Dear Ravi, without practically checking the design it can be difficult to understand the correct specs of the coil…
Reeko says
Dear Sir,
I have made your circuit to power up my 100LEDs with 25LEDs in series and 4×25 LEDs in parallel. Its working fine. Just a concern. Shall I put a current limiting resistor on every 25LEDs branch. I tried putting 6.8K 1W and its getting quite warm. I am using the christmas Light LEDs C6 E10 0.1W 15mA. Your advise is greatly appreciated.
Swagatam says
Dear Reeko, I am glad it's serving the purpose for you…however the 474 capacitor won't generate more than 25mA, therefore it's strange if the resistor is getting warm.
Don't use 6.8K because it's too high, use 100 ohm 1 watt and see the difference.
alternatively, you an make just two channels each having 50 LEDs, that would make the design even more efficient, cooler and brighter.
Unknown says
If I have to reduce the no. Of LEDs to 4 hence what is the resistor I have to connect in series??
Can you please give the calculation if possible ckt diagram.
Swagatam says
replace C3 with a 15V/1 watt zener diode, no other changes would be required, assuming your LEDs are 20mA type
sagar bhalla says
Dear Swagatam,
I made this circuit and its absolutely working fine.
I am an electronic hobbyist and want to learn in electronic and enhance my knowledge on field of electronics and circuit. Please could you recommned any book or tutorial. I was not PCM student.
Thanks again.
Rgds
Sagar
Swagatam says
Thanks Sagar, I am glad to know this.
There are plenty of books and tutorials online, you can elect any of these as per your convinience
Harish A says
I want to drive 3v 150ma leds. I have connected 3 leds in parallel and have connected 24 such parallel leds in series. I wanna know whether this circuit will suit my requirement?. Also kindly tel me the current output of your circuit.
Swagatam says
No it won't….you will need to connect all the LEDs in series for making it work with this circuit…and for 150mA you may have to use 1uF/400V x 3 capacitors in parallel instead of the shown 474/400V
asif iqbal says
Sir i want to make a sign board like "Welcome" with 555 and 4017.I will need seven strings ,each consisting of max 38 LEDs in series.Can i use this supply circuit ? Can you please refer me to such a circuit diagram…
Swagatam says
Asif, you can use the first circuit idea from this link
https://homemade-circuits.com/2013/03/sequential-bar-graph-turn-light.html
it is designed for 6 outputs but you can easily modify it with 7 outputs, if possible I'll try to post it in new article.
Egerega Gabriel says
hello Swag good morning. pls am new here and my questions might sound so childish but i really want to learn from this blog. please Sir i want to design a 36W LED bulb with 220-240V input without a transformer. please advice kindly. thanks
Swagatam says
Thanks egerega, you can try the following concept
https://homemade-circuits.com/2016/07/scr-shunt-for-protecting-capacitive-led.html
just replace the 12V zener with a 120V zener diode and use 36nos of 1 watt LEDs in series at the output
the 1K resistor might also require some modification
sagar bhalla says
Hi,
I have 15 No's of white LED 5mm, would it work on the same circuit as you advised?
Swagatam says
yes it will….just make sure to use an NTC at the input side.
GANDHI AKUL says
hello…..please suggest me….how can i calculate the valve of c1,c2,r1,r2…for different watt level of led bulb….how can i built transformer less rectifier circuit…????
Swagatam says
R1, R2 combined value can be calculated by the following formula
Supply voltage input minus Total LED FWD drop divided by LED current rating
capacitor value calculation is not important, but higher value will give better results.
however the professional of combating surge current is to include a NTC thermistor at the input mains side, as explained below
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
Unknown says
Please reply how to make led in home use 3volt, 5 volt, 9volt, please reply and what's the parts needed, to make it
Swagatam says
which type of LED??
Kiran p v says
Help sir ,how to connect 8 mm 50 nos led,s to 220 AC supply.which value resistance ,capacitor and diode for need that connection.
Swagatam says
Kiran, you can use the same circuit which is shown above if the current rating of the LEDs is 20mA, if it's more then you may have to increase the input capacitor value accordingly
David Sanchez M. says
Hi Sir … I see this is an old post, but I want to know:
Here in Mexico we only have 120v. What changes I need to do to this circuit to make it work?
Thanks!!
Swagatam says
Hi David, you can use the same circuit for 120V supply also, but more than 40 LEDs cannot be accommodated in series, ….upto 40 LeDs will work nicely
mohsen asadi says
Hi, whats that circuit lumen?
Anthony Tunguy-Desmarais says
Hi, I find your circuit interesting and I modeled it up in everycircuit with 16 LED's (5630 type). But in the simulation the current through the LED's is far too high, this is only resolved if I reduce the 500nF capacitor to about 1.2nF.
http://everycircuit.com/circuit/4562220067848192
Can you explain how this works, I can see that the input capacitor's reactance is being used as a voltage divider, but then surely the capacitors value needs to be adjusted for the number of LED's and the unput voltage?
Swagatam says
Hi, that's why I consider simulators useless….and I never use them.
0.47 is supposed to provide around 35mA current to the indicated 20mA LEDs, the excess 15mA could be dropped by the series resistors, in fact it could drop the current below 20mA I have not calculated it….but 0.47 is an optimal value…..
for 5630 LEDs, even the 0.47uF won't be sufficient, since these are rated at 1/2 watt and would require around 150mA current…that's huge and could call for a capacitor as high as a 2.5uF for achieving optimal performance in the above circuit.
satheesh k Nalluswamy says
Respected sir.,
1. pleas tell me i want now the difference between ntc and vairistor(mov)?
2. Can i use 10D431k mov ?
Swagatam says
Satheesh, both are surge suppressors, NTC is connected in series with one of the mains input supply lines while MOV is connected between or across the supply lines.
the specified MOV is not a good choice due to its higher clamping voltage spec (700V)…..it should be around 300V not above this.
kamlesh_sexy says
the image shared on g+ already, pls chk it, I am waiting.
thank you 🙂
Swagatam says
give me the link.
kamlesh_sexy says
https://drive.google.com/file/d/0B2l5VansvCMBSzZhN1MteVA1aFE/view?usp=sharing
Swagatam says
yes it looks OK to me, just reduce the values of R2, R3 to 10 ohms 1 watt for better illumination, rest all is perfect, but 1 watt LEDs will not work…will produce lower illumination
kamlesh_sexy says
You told me to reduce R2 & R3 value from 50ohm to 10ohm for 1 watt led,,
if I use 8m straw hat type led so I will get proper illumination??? and no need to change any parts value????
the written on 8mm led is: 3-3.3v 0.35w. I hope its not more then 25ma.
so I can use 8mm led for better illumination and proper brightness.
Swagatam says
yes that's right you will get better illumination with straw hat LEDs, but keep R1/R2 = 10 ohms….50 ohm could decrease the illumination a bit
kamlesh_sexy says
HI Friend…
I want to ask something here, you mentioned 40 Led's (white 5mm straw-hat type) on your circuit,
my question is:-
1. Can I use 1w led's instead of 5mm straw-hat type?
2. If yes then how many 1w led's I can use with this circuit? (without any changes circuit parts)
3. What is the minimum & maximum life of this circuit?
4. This circuit can handle low voltage?? (Due to rainy season you know sometimes we get low voltage in home. or If E.B workers works on the sreets and sometimes they try to connect line and we can see the voltage flick 2,3 times)
Thanks in advance…
Swagatam says
Hi friend,
yes you can use 1 watt LEDs, anything between 40 and 90 LEDs in series can be tried….but you may have to increase the input capacitor value to 3uF/400V.
the circuit life is permanent, but the LEDs can get burnt if an NTC or any other suitable surge limiter device is not included..so you need to include one at the input
The low voltage handling range will depend on how many LEDs are used in series….40 LEDs will allow upto 140V AC input drop…and so on
kamlesh_sexy says
Thank you SM, for vry quick reply,,
I have few little doubt, I hope u will clear.
1. I don't know what is my 1w led current, generally 1w led current is 300 to 350ma, but mine I don't know whether it is really 300/350ma or what…. so how to know the led current value? any calculation?
2. you told me to put NTC at the input, :- what value of NTC I have to put? I mean what rating of NTC?? & and I am confused where to put NTC exactly….
This circuit is work well with 5mm @20ma normal led's… but I want to run 1w led's. pls clear my above doubts
Swagatam says
Kmalesh, if you are saying it's 1 watt then obviously its current is 300mA, as per the following formula:
P = I x V
1 = I x 3.3
I = 1/3.3 = 0.3 or 300mA
for NTC connection and spec detail you can refer to the following article and use the one shown there:
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
consult with your electronic dealer regarding the number of the NTC, to be on the safer side
kamlesh_sexy says
Oh thankssssssssssssss.
I got it… ur great… I got it, the NTC should be put before c1(c1 and r1 as shown on ur above link article 1st picture).. you shown NTC value is 5D 11 (5ohm 11mm). you mean I an use NTC 5d 11,, Ok I will do and check, if any issue, I will free to text you.
Thank you very much friend….
kamlesh_sexy says
I made this circuit but still not put in mains, before I put in mains, I want to show you, please click this link to see circuit
https://drive.google.com/open?id=0B2l5VansvCMBSzZhN1MteVA1aFE
rply soon,
Thank you FRIEND 🙂
Swagatam says
yes, according to me you can use 5D11 NTC for your application….the link is not opening because you might not have toggled the "share" option….tick the box and resend the link
Walter Marafioti says
hello Swagatam can you help me with a grow lamp diagram 200 LED 3 watt direct 220
best regards walter
Walter Marafioti says
hello Swagatam
Please I need your help for a diagram for a LED grow lamp ,direct power 220 volts
4 red 1 blue all 3 watt LED , I would like to have 200 LED to create 600 watt
Swagatam says
hello walter, I think I have answered to this question somewhere previously,
anyway, you'll need an SMPS for driving 3w LEDs, you can't drive directly from 220V
Lord of Blackspot says
Dear sir.
I'm SHRiNiVAS,
first of all, I've no words how to thank you for all this. Bcoz I'm art student so electronics is thousands of miles away from my academic career. Bt your blog made me able to build circuits with full understandings.
I've made this circuit with 90 LEDs. I'm getting so good illumination. I've also made your 1W single LED 220V AC circuit. Both are running very well. Now I want to attach only single 5mm LED to this 1 watt circuit. Actually I have posted you this requirement in the comment in that 1W circuit page bt maybe it couldn't reach to you or you may angry with me. Bcoz I couldn't got your reply. Well, if you got this message, please suggest some modifications in your 1W 220V AC circuit to attach only single 5mm white LED with safe brightness according to its durability.
I hope my this effort won't be wasted.
Thank you sir.
Swagatam says
Dear Srinivas,
I have replied to your previous comment also….please press the "load more" button to see hidden comments on pages which have more than 200 comments.
for a single 5mm LED you just need to change the input capacitor value to 0.33uF/400V that's all….
kamlesh_sexy says
Hi friend,
exactly i was waiting for this…….
I seen ur 1st diagram, you shown 40 led connected in series. i want to ask you that if the single led 1w x 40 (3v) (in series) = 1w, 120v. Ok means watt will be the same only volt increased, but by my thinking its equal to 40w brightness… am i right??????
next question is: which is the best?? >>> led in series or led in parallel ???
next question is: this above circuit is durable? (long lasting) (if all parts purchased new from market, not from recycle)
Thank you,
Swagatam says
Hi friend,
1watt led will not provide enough light because the current is too less in this circuit.
but if you connect 5mm LEDs and use 50 LEDs then that would provide equivalent to 3 watts of light…so it's better to use 5mm LEDs than 1 watt LED
use an NTC….or an MOV at the input f the circuit…then it'll be long lasting and reliable
in the above type of designs, series is always better, but for 12V adapters parallel is better…
timeandspacecadet says
Hi much respect to you for answering all the questions.
I have 1cm square 12v 10w leds, can I use this circuit or would I need to change some values?
Thank you
Swagatam says
thanks time&space, the above circuit is only for low current LEDs, for a high watt LEd such as yours, a 12V 1amp SMPS would be recommended
timeandspacecadet says
Thank you for your reply, so if I want to put 30x 12v 10w should I put them in parallel with a 12v SMPS?
Swagatam says
yes you can do that, but the 12V SMPS will need to be above 30 amp rated, or you can even try a 0-12V/50amp transformer for the same after aptly rectifying the output to a pure DC.
a current controller circuit would also be required, but you can skip this by making use of a fan cooling behind the LED heatsink.
Anonymous says
Hi,
Good day. Nice circuit.
Can I use this circuit for 20 LED’s?
LED’s are 3.6V 20mA.
Mains Supply Voltage 240V 50Hz.
If component values need changing please indicate which components and new values.
The 20 LED’s connected in series give 3.6V x 20 = 72V.
Is a limiting resistor required?
What value?
Above I have read that a reader added an NTC and MOV for protection.
Can these be included also for 20 LED’s?
How are these connected?
What will be the values for the NTC and MOV?
Will a Zener Diode add further circuit protection?
What will be the value of the Zener Diode and how should it be connected?
Will it require a resistor in series?
Thanks.
Swagatam says
Hi, yes you can use 20 LEDs with the shown circuit.
no changes would be required in the circuit, if you see the resistors getting warm reduce it to 10 ohms each.
connect a 80V/1 watt zener across C3.
NTC/MOV can be used for extra safety, although technically the zener alone would be enough for the protecting the LED from current surges.
NTC/MOV may be rated to control 100V (clamping voltage)
Sri says
You are doing an awesome work and really helped me a lot.
https://homemade-circuits.com/2012/04/how-to-make-led-bulb-circuit.html
My requirement is to design 5630 leds (30 leds in series 70 leds in series) numbers.
What would I need to change in circuit if I have to increase forward current to 150mA, and what other things needs to be modified to make circuit reliable
Swagatam says
Thanks Sri, you can simply increase the input capacitor value to 2uF/400V for getting 150mA.
However make sure to use an NTC thermistor at the input and also if possible a 200 to 500 turn coil over any iron core in series with the LED string
basit momin says
Hello sir I want to run 300 leds of 5mm or 8mm to 230v AC main of 6 series in parallel each series of 50 leds so wat will be the changes for the circuit
Swagatam says
Hello Basit, for this you may have to increase the input cap value to 2uF/400V by connecting two 105/400V in parallel, rest everything can be left as is.
make sure each string has its own series a 22 ohm 1 watt resistor or any value between 15 and 30 ohms
basit momin says
Hello sir I want to run 300 leds of 5mm or 8mm to 230v AC main so wat will be the changes for the circuit
Swagatam says
use 4nos of 75 LED string and connect them in parallel, no changes would be required in the existing design
basit momin says
How much nos of smd led will work for this circuit and if I want to connect 100 nos of smd leds what will be the changes for the circuit
Swagatam says
please check the above comment
basit momin says
Sir how much number of smd led will work for this circuit and if I want to connect 100 nos of smd led in series wat will be the changes for this circuit
Swagatam says
Basit, since the maximum available voltage from the 220V input after rectification will be 330V so dividing this by the forward voltage of the LED gives 330/3.3 = 100
so yes 100 LEDs will be just OK and can be connected in series,
no changes will be required in the design.
gogutu says
buna ziua domnule swagatam.cum pot face o lampa la 220v cu banda leduri auto de 12v.un exemplu de conectare leduri.multumesc anticipat.
Swagatam says
gogutu I id not understand your question, is your question about how to run a 220v strip light on 12V???
Sridaran Sundaram says
can i use 5630 with this circuit
Swagatam says
yes you can use it
Hassan Ac says
Dear sir.
I build this circuit successful.but switch off time bulb instal in bulb holder. then bulb very very dim illuminate .
1.why did it happen?
another matter
2.can I increase bright in the circuit?
Swagatam says
Dear Hassan,
i did not understand your query: ….."but switch off time bulb instal in bulb holder. then bulb very very dim illuminate"
use more number of LED in series to increase the illumination…use at least 60 LEDs to make it bright and safe.
also use a coil in series with the positive line….the coil can be made by winding 200 turns of 0.5mm magnet wire over an iron nail or bolt…this will prevent the initial surge current from entering the circuit
Hassan Ac says
sir
1.can I use and smd type LED(20 nos.)in the circuit?
2.can I do it a homemade business ?
Pls reply sir
Swagatam says
yes smd LEDs can be used.
for commercial production you may should prefer an SMPS design for reliability.
Hassan Ac says
Sir'
Will I give resister with LED?
Swagatam says
R2 and R3 are already present so no more resistors would be required.
orrie says
sir.
mey 2nos 5w led se 10w lamp banana chata hu.cap power se. sir yea circuit me keya change kerna parega.
plz sir
Swagatam says
orrie, capacitor power supply will not work for this, you'll need an an SMPS for it
Kumar Kumar says
hi sir i need 8mm led(3.2v,50ma)drive circuit.
Swagatam says
For how many LEDs?
Hz021 says
hello dear mr Swagatam Majumdar
first of all i want to thank you for making such good blog and let us know how to make incribble things.
i have some question from you i hope i could have my answers.
i maked this circuit and two other circiuts too
i want to choise best and the one that is smallest and taking little space
first of all i want to ask : can i run 20 or 18 or 38 smd leds (5730 model)on this circut?
if i want to reduce leds to 18 what prameter should be change?
if the leds goes up there will be changes in cureent and volatage too.
but i want to this circiut delevery me 19 mA and 3.2 v for every led.
you said cureent output will calculated by ractounce formula : Xc = 1/2(pi) fC
if circuit eleverys 70ma out put will this burns leds?
how should i controll the amp that pass leds? should i use resistor?
if i use resistors thre will be voltage drops too. you said useing output cureent will drop mains from 308 to 0 !
i`m a little bit of confused i`ll be thanks ful for your answrs.
thank you again for your time.
Swagatam says
thanks Hz021,
you can use the number of LEDs as per your requirement, just make sure the current requirement of the LED string matches with the capacitor's current delivering capacity.
This can be calculated using the reactance formula which I have comprehensively covered in one of my recent articles.
Resitor can be used for controlling current but calculating the capacitor value correctly is recommended for ensuring proper efficiency and safety of the LEDs.
All's been explained in the following article
https://homemade-circuits.com/2015/01/calculating-capacitor-current-in.html
Additionally you may also want to include an NTC thermistor in order to arrest the switch ON surges which sometimes become the major cause of LED burning problems in these circuits.
Thilina Jayasingha says
sir can you tell me what is the R1 @ R2 is calculating eqution?
Swagatam says
Thilina, The formula is R = (V – LED Fwd volt) divided by LeD current
Ebed Tang says
Hi swagatam,
I want to build this circuit. You said that if you used ntc thermistor the leds would last longer.
So what is the value of the ntc?
Sorry if my question is wrong as i'm a new electronic hobbyist who just visited your blog lately. But could you give me little light about that ntc thing for this project?
Swagatam says
Hi Ebed,
you can use the one that's shown in the following article:
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
Rohith N says
sorry for asking too much… finally made with 40 leds, working fine bright,due to absence of zener, i got a 33D NTC from electronic ballast , it was present at i/p of supply in ballast. i used it in series with leds… lit very brightly n some leds gone. 33D cannot be used?
necessary to connect it at 230v i/p of ckt?
Swagatam says
replace the input capacitor with a 0.22uF/400V and check the response, if the brightness is good continue with it in the circuit, it will also reduce the surge current and stop the LEds from blowing off, without the need of an NTC. if possible use a coil in series with the LED chain for better protection. The coil could be made by winding 200 turns of 0.3mm magnet wire over any ferrite rod.
Hz021 says
Hi.. 🙂
my name is Hz021 and i`m a guy how loves your blog!
it`s full of treasure for me… XD
but i have some questions about this circuit i hope you can help me.. (please)
Q1: i want to use 20 smd leds each needs 20 mA and 3.4 volt for high bright. can you help me about value of caps and resistors? and please help me to learn how calculate the value for any other uses and situations.
thanks again…
Swagatam says
Thanks Hz021,
Typically a 0.47uF/400V would also work for your application but if you are interested to know the exact capacitor value, it will need to be calculated by first calculating the reactance of the capacitor and then by using ohms law to find its current capacity.
Once you find the reactance use it in place of resistance in Ohms law, voltage will be 310V after rectification, the third parameter "I" can be easily calculated then.
Hz021 says
thanx.. god bless you sir!.. 😀
Rohith N says
Thank you sir…. i will use some 30 leds with 56ohms r and a 50v zener , i hope zener can be of any watt. 50v zener would be available in markets , also please give any substitutes if any…
Swagatam says
If you don't find a 50V zener or any other closer value, then you can use two 24v zener in series for the same result
Swagatam says
the zener should be 1 watt rated…
Rohith N says
hi sir, i got 2nos 27v 1w zener instead. The zeners should be connected in series & then in parallel with led string, the +ve of zener to +ve of led & the banded to -ve of led string?
Rohith N says
As iam using 56ohms 2 resistors i can connect 30 to 40 leds will be fine working?
Swagatam says
Hi Rohith, yes the zeners can be put in series and used….the banded side will connect with the anode end of the LEd string and the other side of the zener will connect with the cathode end of the LED string.
Rohith N says
wow really awesome…. its really working bright…. at first it doesnt illuminated when i removed the zeners its working , i used 30 leds then 40. iam having 33D NTC can i use?
thank you sir for posting such awesome circuits….
Swagatam says
Thanks Rohith,
yes you can use the mentioned NTC for suppressing surge.
actually for 30/40 LEDs, the zener should be a 150V rated.
My previous suggestion was for your earlier comment where you intended to use only 10 LEDs.
Rohith N says
As iam having 56ohms r2,r3 how many leds would be needed?
1) how can i calculate the no of leds to be connected?
2) if iam using a no of leds how to calculate resistance for this ckt?
3)50v zener would be sufficient for any no of leds?wattage of zener?
Swagatam says
lower resistance would increase surge current risks if the LEDs are small in number.
at least 30 LEDs would be require if 50+50 resistances are used.
however with a zener diode installed the risks could be completely prevented.
multiply 3.3 with the number of LEDs and add 10 to it this would roughly give you the zener value for the particular number of LEDs.
Rohith N says
Hi sir, i got c1 as 6H474K 2L D its 474 /400v? i got it from shop. also R2,R3 56 ohms c2,c3 4.7mF/250v and planning to use 10 leds to this. can i proceed?
also please tell what value of ntc to be connected for safety? ntc connected to ac supply input?
Swagatam says
Hi Rohith, I am not sure about the capacitor number, you'll need to try it practically to confirm.
for 10 leds use 1k/1watt for R2, R3……C2, C3 is fine.
NTC won't be required for such a small circuit according to me, if possible connect a 50V zener parallel to the LEDs series end leads.
Herry Rendra says
how many led cant carry this circuit ? now i have 100 leds straw hat white ? can't the circuit apply with 100 leds !!
Swagatam says
100 x 3.3 = 330V. after rectification the ac should reach this values so I think the circuit would be able to handle all the 100 leds with a 220V input.
Avik Paul says
thanks
Avik Paul says
Sir,
sir if i want to use 105 capacitor is it any change need in this circuit….?????
Swagatam says
no changes would be required!
Avik Paul says
Sir,
As per specification 8mm LED 3.2v & 150mA.
Swagatam says
for 150mA leds, 105 capacitor will be OK, you may use it.
Avik Paul says
Sir, I want to use 8mm LED
Swagatam says
8mm leds are also rated at 20 to 25mA so they will be also vulnerable, using 474/400V will be safer
Avik Paul says
Hi Sir how r U…..
If I change input capacitor 474k 400v to 105k 400v what change i need…
Swagatam says
Hi avik,
if you are using 5mm leds, it could get slowly damaged with a 1uF cap.
pradeep says
sir what kind of pcb we used for making circuit for led bulb/tube?
how much is life of these circuit?
how can we increase life of these circuits?
Swagatam says
You can include an NTC thermister at the input for increasing the life of the LEDs and the circuit.
A glass epoxy PCB would be fine for this project.
Paula Paula says
Appreciate your help swagatam. Regards
Paula Paula says
Good evening swagatam i your knowledge very valuablemthan you for sharing! Iwill take lus m advise as my country power is 110v also, but i have 5mm round superbright leds at 30ma 3.2v can i still use the same circuit or i habe to change something else? Kind regards
Swagatam says
Hi Paula,
you can use the same circuit as given above even with 110V inputs, just make sure the total LED count in the series does not exceed 30nos. otherwise the illumination could get weaker.
Avik Paul says
Thanks
Avik Paul says
Hello swagatam
This circuit at this blog "How to Make a LED "Bulb" work with inverter ?
Swagatam says
Avik, yes it will work with an inverter output also.
lus m says
Thank you very much swagatam
lus m says
Hello swagatam.
Could you help me with the values of r1,r2,r3. The values and types of ci and c2, the values for d1,d2,d3,d4 for 110v ac. i am using the same 40 leds 3.2 v 30ma thank you in advance.
Ps congrats you have the best circuit in the net
Swagatam says
Hello Lus,
You can use the same circuit which is given above for your application also, nothing needs to be changed except may be R2/R3 which can be reduced to 50 Ohms each.
Ram says
Please suggest the exact value of NTC which we can use for Surge Suppressor for the circuit
https://homemade-circuits.com/2012/04/how-to-make-led-bulb-circuit.html
And please also mention if the require NTC value is 5d-11 for
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
And if time allow please elaborate in Surge protection circuit which we can design from component available in market. I read your topic on surge protection but exact value are not mention ( like for MOV ) so it difficult for beginners …. Facing very difficulties due to voltage fluctuation in my village town. many led bulb are stopped working. so kindly please reply. looking forward to hearing from you …..
posted on your fb wall too, plz reply,, really needed your help
Swagatam says
There's a big range of NTCs and MOVs ithe list and it's difficult to suggest a particular value because they are so closely differentiated, so it would be better to consult with your local electronic dealer regarding the correct one.
If you want to avoid an NTC, you can use a transformer power supply in place of capacitive power supply and use a 7812 or 7824 IC for getting a well regulated power supply.
Rohith N says
sir i need to connect only 10 to 20 leds what changes should be needed?
Swagatam says
You can use the same circuit which is shown above.
sk md izhar says
Hello sir……
Can i put 4 strings of. 10 led in parallel???
What could be change in the circuit?
Swagatam says
Helo sk,
Parallel srings will result in low illumination, so it's not recommended, you should connect all the LEDs in series only.
hjohnjo says
Good afternoon friends.
My name is john, my passion to design an LED star lighting system is very intense but i don't have the complete knowledge yet, that is why i decided to access the internet to acquire more knowledge, in search i found your blog, with what i saw i was amase and as well happy because i know i can get some aid from you.
My question is if my main is 220V , i want working 45-50 LED, i dont know value of resistor and capacitor . if you dont mind plz tell the electricity diagram
can i know the value of resistor to use in series with the 3-LED?
Swagatam says
Hi John, if you want to use a capacitive power supply as explained above, then probably the calculations won't be too critical, still you can refer to the following article for details:
https://homemade-circuits.com/2011/12/how-to-calculate-and-deduce-current-and.html
with 3 leds the formula for the resistance would be
R = supply V minus total led forward V divided by LED current
hjohnjo says
i am sorry i dont understand
My question is if my main is 220V , i want working 45-50 LED, i dont know value of resistor and capacitor . if you dont mind plz tell the electricity diagram
hjohnjo says
my main 220v, i have 1watt LED 45ps, how i can work this LED's 220v ???
Swagatam says
you did not mention in your first comment regarding 1 watt LEDs…for 1 watt leds,45 nos you will need a 12V 5amp smps power supply and connect with it 15 parallel strings of these leds each having 3 leds and a separate 6ohm 1 wat resistor
hjohnjo says
hi …swagatam
i dont have smps power supply…i dont want use smps power supply…i have 1n4007 4ps,474/400v 1ps, 10uF/400v 1ps….how connect
Avik Paul says
Sir,
Do you have any circuit which provide 12v 100ma power supply………
Swagatam says
Avik, you can try the following design:
https://homemade-circuits.com/2012/08/high-current-transformerless-power.html
dimension the input cap for 100ma output
sk md izhar says
Hello sir…..
can i put 10 strings of 4 leds in parallel??
What could be change in the circuit?
Avik Paul says
Sir, Can i use 250v MOV in parallel in front of input voltage in this circuit for high volt protection……
PLZ Suggest me….
Swagatam says
Yes, you can use it, put it after C1
Anonymous says
hi swagatam,
I just wanted to know if we can use cob type led for this 'bulb' circuit ?
Swagatam says
yes SMD leds will also work here.
Bharat says
Hey Swagatam,
is there any substitute for 200V, 1watt Zener Diode???
plz tell me
Swagatam says
Hi Bharat,
You can try this circuit, remove D1 and use it for setting any desired surge free output voltage
https://homemade-circuits.com/2013/02/how-to-make-simple-220v-transformerless.html
jappar says
Tanks Mr. Swagatam, I've done with this circuit. My Question is what kind of LEDs to make a real bulb, I mean not corn bulb, so we need less LEDs (3-10) & can I appy this circuit to do that? #reallysorry'boutmyBadEnglish
Anonymous says
Sir, can you post a very reliable 10w LED bulb circuit, i wll be very thankful to you
Swagatam says
you can take the help of the following post for making it:
https://homemade-circuits.com/2013/06/universal-high-watt-led-current-limiter.html
Deepak Maurya says
Hello sir, i want to launch LED Bulbs in the market at low cost and also want to provide 1 year guarrenty with it.
So, is this circuit suitable for this?
Swagatam says
Hello Deepak,
I am not quite sure about the life of this circuit, however by putting a 200V/3w zener diode parallel to C2 can make the circuit much reliable.
Rabindra sahu says
Sir,
Please describe by a circuit diagram,i don’t understand ,what is (310V / 2 watt zener diode across the supply lines after the bridge rectifier).
What type of wire I will use for series.i have no idea on electronic,please sir help me for understand.
Rabindra sahu says
How I make a deep light for deepabali,to decorat my home.please sir give me a circuit diagram,which is work for a long time.
Rabindra sahu says
Sir please give me a Running led series circuit diagram.
Rabindra sahu says
Sir,
What is (310V / 2 watt zener diode across the supply lines after the bridge rectifier) ,I don’t know ,please clarify me by above circuit diagram.
Which type of wire I will be use for series led connection.
Sir please help me, thanks
Swag says
Rabindra, I have updated the diagram for you in the above article, you can check it out
Rabindra sahu says
Good morning sir,
Please reply me immediately.Then I will start my project.It is not my professional it only to gain knowledge. Help me sir
Swag says
Hi Rabindra, I have already replied you!!
Rabindra sahu says
Sir,
can I connect 100 pic 3.6 volt blue or multi colour led with above circuit.The circuit is long term or not.
Swag says
Rabindra, yes you can do it, but use 93 or 96 LEDs for optimum brightness.
Swag says
…it will be long term if you add a 310V / 2 watt zener diode across the supply lines after the bridge rectifier
kapil says
Hello sir,
Sir i want to drive 160 led can i use 32 -32 led's group in parallel with this circuit.plz help me out
Swagatam says
hello Kapil,
yes you can do that!
Opeoluwa Opeyemi says
hello
Dilandkl says
ohh i see….. so do you have an awesome circuit to drive 1 watt power LED's? I searched your site but i couldn't find it anywhere. It would be a real help if you could post a circuit for 1 watt led's.
Thanks in advance!!
Swagatam says
I have something in my mind regarding this, will share it soon in my blog.
Dilandkl says
so if i changed the main 474k 400v cap to 3 uf, and the 1 uf cap to 100uf will i be able to drive 12+ 1watt led's in series with maximum brightness?
Swagatam says
Unless you make the forward of the LEDs equal to the output voltage of the capacitor, it won't work.
you will have to connect at least 60/70 LEDs in series only then you might be able to reach full illumination.
Dilandkl says
Oh another thing Mr. Swagatam if i were to power 12, 1watt LED's in series(with maximum brightness, what changes do i need to do to your circuit?
Swagatam says
capacitive power supplies are well suited for low current high voltage type devices, 1 watt LEDs do not come under this category and therefore will not work efficiently with the above circuit.
Dilandkl says
OK I'll do that, thanks for the advice.
One more thing Mr Swagatam, I made another one of these circuits, and when I checked the output voltage my multimeter reads 27 volts is that correct? or is something wrong with my circuit?
And on another occasion i built your circuit it worked fine for a couple of days, but then it stopped working. My bulb has 35 led's in series, I checked the led's, all of them were fine. Then i started to power the leds 5 at a time, and they DID light up. When i reached 20 the leds were dim, and above 20 led's none of them would light up. This is strange cause all 35 led's were working 2 days ago(very bright too), and now the circuit doesn't have enough juice to power all of them. Could you tell me why this happened??
THANKS IN ADVANCE!
Swagatam says
Without load it should read equal to the bridge capacitor value, therefore the bridge capacitor should be rated at the highest possible value. lower values will slowy damage and leak the capacitor.
for 35 LEDs, the output should be 35×3 = around 100V, I tink either one of the capacitors may be faulty in the circuit.
Dilandkl says
HI! Mr.Swagatam i built your awesome circuit and it was working fine! After a couple of months it started to flicker. Now after 2 days of flicking it's stopped working. Could you tell me why this could have happened, could it be that one of the caps has gone bad?
Thanks!!
Swagatam says
Hi Dilandki, this problem is the main issue with these kinds of circuits, it happens due to occasional surge currents, you can either use a thermister at the input for cancelling these surges or use an SCR network as shown in this post:
https://homemade-circuits.com/2013/05/variable-surge-free-high-current.html
for thermister connection see this circuit:
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
Kelvin Iyiriaro says
Thanks for your reply sir.
Kelvin Iyiriaro says
Thanks for your reply sir.
Q1. If my supply voltage is 220v, does this means that the FWD voltage for 1LED is 2.2v?
Q2. How can i get the LED current?
Swagatam says
FWD voltage and current are fixed parameters as per the particular LED specifications, check out their datasheets for it.
For example a 5mm LED normally has 3.3V as the FWD voltage and 20mA as the operating current.
Kelvin Iyiriaro says
Thanks for your reply sir.
What i am asking is, how will i know the values of the resistors to use in series with the 3-leds connected in series in the circuit constructed by Mr.Ishaan Pathania if i am to construct the same circuit?
kelvin iyiriaro says
Thanks for the reply.
The circuit i am talking about is the one constructed by Mr.Ishaan Pathania your follower.
How can i get the value of the resistor he used?
Swagatam says
The prototype used a 12V supply, the formula mentioned above is standard for all supply voltages, and may be used for the prototype also.
kelvin iyiriaro says
Good afternoon swagatam.
My name is kelvin, my passion to design an LED lighting system is very intense but i don't have the complete knowledge yet, that is why i decided to access the internet to acquire more knowledge, in search i found your blog, with what i saw i was amase and as well happy because i know i can get some aid from you.
From the prototype above 3-LED was connected in series with a resistor.
My question is if my main is 220V how can i know the value of resistor to use in series with the 3-LED?
Swagatam says
Hi Kelvin, thanks!
You can use the following formula:
Supply voltage – LED fwd voltage divided by LED current
With a capacitive power supply, after rectification the output would be 330V, 3 LED would have 3.3×3 = 9.9V as the FWD voltage and with 5mm LEDs the current for the series would be 20mA or 0.02 A,
Therefore 330 – 10/.02 = 16000 ohms or 16k is the resistor required.
But practically any smaller value resistance works with the above type of circuit because the current input from the capacitor is too low and therefore has little strength to burn anything.
Anonymous says
hai sir first thank to you.
sir how to construct circuit for 230V/12V 2AMP. WHAT COMPONENTS i will change for changing voltage and current.
Swagatam says
A capacitive power supply cannot be modified for producing 2 amp current, it can be dangerous and is not recommended.
Anonymous says
hello sir
am shail
i would like to know what changes should be done to circuit to make it work in range from 110-220 v
and 50 to 60 frequenct
thank you
Swagatam says
hello shail,
the above circuit will work for both the voltages, however 120V won't support more than 32 LEDs.
Anonymous says
Jash from Sri-lanka-
Dear Sir,
Is this circuit works with 01watt 05nos LEDS's in series connection ?
thanks
Swagatam says
Dear Jash,
No, this circuit will not be able to drive 1 watt LEDs.
Anonymous says
Hello Mr Swagtam
Thanks for this circuit
how can I use 67 LED lights for your circuit. Because my printed board has designed for 67 LED s.
Thank you again
Kumar
Swagatam says
Hello Kumar and aruna,
use the same circuit which is given above for 65-70 LEds….connect all the LEDs in series, the circuit will then operate at 220v, not at 120V though.
Anonymous says
Hi sir
I need put around 65-70 LED s to this circuit. So what the new Values for
R2 and R3
many thanks
I'm Aruna
Anonymous says
Anyone plz post a picture of this circuit and how bright it glows.
renjith says
sir i want t o operate it using the battery then wht should be the rating of the battery for 40 leds and if there any change in circuit.
thnku sir,
renjith
Swagatam says
you can use a 12V 7ah battery, make 13 strings of LEDs having 3 series LEDs with individual 220 ohms, connect all the strings in parallel to the battery
Anonymous says
Sir,
I am made this circuit successfully & it worked.
I am Used 12(chain) LED.
I Would request U Please tell me how to measure how many watt use when 12 LEDs are emitting.
Swagatam says
measure the current by connecting a DC ammeter (DMM set to DC current range) in series with the LED chain, record the reading.
Next measure the voltage just across the LED chain.
multiply the two values to get the power consumption.
Anonymous says
Sir,
I masure it. It shown 2.2watt..
Now I want to know when I plug it with wall socket after 1-2 minute LED are mightly glowing like Phosporus & also when I turn off the wall socket switch..
WHAT IS THE MATTER…
Please tell me.
Thanks.
Avik
Swagatam says
one of the LEDs might have blown off, check each LED and find the faulty one and replace it with a new one.
Anonymous says
Sir,
Not a single LED,all LED are mightly glowing Continuously untill unplug from wall socket but I am not powered on the wall socket switch And also after turn off wall socket switch. Is it any ground related problem. But any type voltage not shown in multi meter.
Please help me.
AVIK
Swagatam says
just reverse the pins of the plug into the socket, and then check.
Anonymous says
Sir,
I want to add a switch with this circuit. Is it possible PLZ suggest me…
Avik
Swagatam says
put it in between C1 and bridge
Darshana, says
Thank You very much for sharing this circuit with us. I built one just now, and working fine. And please tell me ,the main purpose R1 resistor is using in this for discharging C1 or reducing the the voltage. And thank you again for sharing knowledge with us.
Swagatam says
Thanks!
R1 is for discharging C1 when the mains plug is removed… to eliminate 220V shock in the form of stored capacitor current over the plug pins.
Darshana, says
Thank you very much for the explanation.
Anonymous says
hiii,
swagatam
i am sunit , i just try this circuit, i give 40 leds in series , as ur diagram shows. and change the r2 & r3 to 150 ohm , 2 watt . but r2 burns every time. how can i prevent this?
Swagatam says
hi sunit,
I hope you've used 474/400V cap.only
anyway try reducing the values to 50 ohm 2 watt and check.
Rajitha Malinda says
Hi,
Swagatam Majumdar,
How can we adjust the circuit with 230V input
Swagatam says
Hi Ranjith,
The above circuit is designed for 230V only.
Dilandkl says
OK thanks again. You are a great adviser Mr. Swagatam!
Dilandkl says
Mr. Swagatam your circuit works great for 5mm LED's, but when i connect this circuit to a 8mm led its really dim. Anything i can do to make it brighter?
Thanks in advance.
Swagatam says
Mr Dilan,
you may try increasing the cap value at the input to 1uF/400v, see what happens.
Nandana W.D. says
dear sir,
Can you explain about most suitable MOV for this circuit…
thanks,
Nandana.
Swagatam says
Dear Nandana,
you may try using a thermistor instead, please refer to this article:
https://homemade-circuits.com/2013/02/using-ntc-resistor-as-surge-suppressor.html
Dilandkl says
Alrite thank you bro
Dilandkl says
Mr. Swagatam, what will happen if i change R1 and R2 to 100 ohm resistors? will the LED's blow up or will they get brighter(cause they are a little dim rite now)?
Thank You
Dilan Leelawardena
Swagatam says
Mr. Dilan, 100 ohms will slightly increase the light, you can try it, you may try even lower values, it's not critical.
Dilandkl says
We'll do and thank you for your quick reply.
Dilandkl says
MR.Swagatam first of all i need to tell you that your web site is awesome! Thanks to you my knowledge of electronics has been greatly improven.
And secondly i am from Sri lanka and the area which i live in, the Cfl's and the incandescent light bulbs keeps flickering all the time. So will this flickering have any effect on your circuit and the leds??
Thank you
Dilan Leelawardena
Swagatam says
Hi Dilan,
Thanks!
you may put more number of capacitors parallel to the 10uF/250V, this will help stabilize the voltage fluctuations, and will produce constant illumination.
Regards.
Rajan says
Hello Swagatam
Dear i have the same capacitor which i had used in 1w circuit one is 1uf 400v and 2nd is 1uf 250v .
can i use the 1uf 400v instead of c1 474/400V and
1uf 250v instead of C2 10uF/400V ?
Swagatam says
Helo Rajan,
1u will generate more surge currents, so I am a bit skeptical….you better use a 474/400V as the input capacitor for better reliability.
Vaibhao Ingle says
sir can i use 385v MOV to parellel with input capacitor?
Swagatam says
Yes will do.
Swagatam says
Don't put in parallel to the capacitor, put it across the input lines (phase/neutral).
Vaibhao Ingle says
ok sir thank u.
sir can i drive this 5mm led for long time with transformerless power supply (means 1to2 years)
Swagatam says
Add an MOV at the supply input points for better safety and guarantee.
shiharan choudhury says
Use smd led`s for ultra brightness
Vaibhao Ingle says
sir hight bright type means smd or round type leds?
if u know any part no. of these leds.
Swagatam says
any 5mm white LEd which is costly and not cheap will be hi-bright type.
Vaibhao Ingle says
thank u so so much sir your blog is very helpful. i m learning lots of things from your blog and you r realy genius and crystel clear heart for sharing your knowledge.
i had build 4 circuit succesfully from this blog. for my home and they r realy working fine. thaknks again sir….
Swagatam says
you are welcome Vaibhav!
Vaibhao Ingle says
hi sir.
sir i want to build this circuit for my home. let me know the 150nos of 5mm white led can replace the 20w CFL light?
Swagatam says
Hi Vaibhav,
yes 150nos 5mm LED will replace a 20w CFL light…. use high bright type
Vaibhao Ingle says
hi sir u r doing great work your blog is very helpful
sir pls tell me can i use 30
1w power led with full brightness wit this circuit
Swagatam says
Hi Vaibhav,
This circuit won't support 1 watt leds, so it won't work….
Anonymous says
Sir, what will happen if i use 105/400V instead 474/400V,its increase the brightness of all leds?
Anonymous says
I love your blog!
Sir, the led required for this is 5mm straw hat type but can i use square led like the manufactured corn sample lamp?
Swagatam says
105/400v will increase the brightness, but the risk of surge current will increase….
Swagatam says
the square leds are probably 1 watt type, so cannot be used with this circuit…
Anonymous says
Sir, like you said its ok to use the 105/400v but risk the surge current..what parts or components need to change to use 105/400v?
Swagatam says
Use an MOV at the input of the circuit.
Anonymous says
Dear Sir
My name is Thusith and Im from Sri lanka,
can you tell me the parts that will sute for lit 60leds
my email address is thusitha_123@yahoo.com
Thanks
Thusith
Swagatam says
Dear Thusith,
you can use the above circuit for 60 leds also, connect them all in series.
Anonymous says
hi,
mr. Swagatham manjumadar
can i use 6 parallel path carrying 2 leds
and the lamp will glow if any of the LED get damaged?
Swagatam says
no, that won't give sufficient light….it's quite unlikely for any led to get damaged, even if it does, the remaining would still remain illuminated, no worries.
Anonymous says
Hi,
Good day Mr.Swagatam, I would like to ask you if I can use a 2uf/400v instead of a 10uf/400v cap.
Thanks in advance.
Jay
Swagatam says
Hi Jay,
Good Day,
Yes you can use it, it will do the job.
Anonymous says
Hi,
Is the output voltage after the R2 and ground 120VDC?
How can we compute it? For example, I just want 50VDC?
Thanks
Swagatam says
Hi,
Actually the output voltage is across the bridge positive and negative points.
For getting precise 50VDC you can add a 50v zener across the bridge rectifier outputs.
Kartiko Eddy Tjahyono says
Excellent bright,
Sir,
I have a couple of capacitor 105/400V, can I use for this circuit??
Thank you
Swagatam says
Thanks Kartiko,
That's fine…but a single 105/400V will be enough for this circuit.
Kartiko Eddy Tjahyono says
Sir,
I've made this circuit for a 2 bedroom, but I still have some 105/400V, can I use to replace the 474/400V?
I want to make a few more lights with this circuit
Simple and directly lit
Thank you & have a nice day…
Swagatam says
Yes you can use it, but make R2, R3 = 330 Ohms 1 watt each
Anonymous says
Hai dear sir my name is kumar i like mini projects ur blog is helpfull ,i make a mini invarter please help me, 100 wattes inverter in home use purpus ,parts list , how to make , with 3 cfl bulbes ,please help me sir, my email id (22ctkdm@gmail.com) please healp me next how to charging a mobile phone with 6v sla battery with parts list please help me
Swagatam says
Hi Kumar,
You can make the circuit shown in this link:
https://homemade-circuits.com/2012/07/simplest-and-best-100-watt-inverter.html
Anonymous says
Sir can you provide me with a flash light circuit by using the flash type bulb used in camera.using 12vDC or 230VAC
Swagatam says
Do you mean a stroboscope bulb….??
Anonymous says
Yes Sir
Swagatam says
OK I'll try to publish it in this blog soon……
Anonymous says
Thank you eagerly awaiting
Kartiko Eddy Tjahyono says
Sir,
need your advice
R1 = 1M – 2 watt instead of 1M – 1/4 watt
C1 = 474 / 270V instead of 474/400V or 0.5uF/400V PPC
C2 = 10uF/450V instead of 10uF/400V
thank you—
Swagatam says
Will do! Go ahead.
Kartiko Eddy Tjahyono says
Sir,
Thank you,
And I will try to build "LED Tube Light Using Transformer" too, as you shown
Thanks again
eagle says
Thanks ,, for ur reply,
Do u have smps circuit that can use to light up 50-100 LED.
Swagatam says
You can check out the following circuit:
https://homemade-circuits.com/2012/03/how-to-make-simple-12-v-1-amp-switch.html
kumalk says
but it's very complicated, don't u have simple SMP circuit
Swagatam says
You can build a transformer power supply for it as shown here:
https://homemade-circuits.com/2011/12/led-tube-light-using-transformer.html
kumalk says
Dear friend.
Thanks for the circuit. Do u have circuit for stable led driver. Because most of time our main supply is not stable. Its going up and down every time. At that time light of the bulb is also going up and down. I am looking for solution for it .
Waiting for ur reply
Thank you
Swagatam says
Thanks!
An smps circuit can be used for powering LEDs which will provide a constant voltage irrespective of input fluctuations. SMPS power supplies are very stable and compact, perfectly suitable for driving many LEDs together.
saurabh parashar says
hi sir,in your Compact 1 Watt LED Driver Circuit at 220V/110V Mains Voltage…can i cunnect power direct to (on birdge)diode's +/- point and a 56omhs restence apply on LED -tiv side
Swagatam says
No you cannot do that, it will burn the whole circuit instantly.
playdoah says
Hello,
What would I have to do to make this work with the US 120v outlets?
Thanks
Swagatam says
Hello,
Just reduce 10 LEDs from the series for using with 120V inputs.
Kartiko Eddy Tjahyono says
Sir,
Can I replace C1 with 105/400V instead of 104/400V
I couldn't find the 104/400V
Thanks…
Swagatam says
Yes you may do it…
Swagatam says
Yes they may be used, but the corresponding resistor values may need some tweaking for optimizing uniform brightness…
Reden Dayao says
Sir can i use 1W LED for this circuit? or a combination of 1W LED and 15mm white LED? thanks sir..
Muneeb Abdulla says
hi.. can u please tell me how can i connect 7 parallel of 4led in series, making 28 leds, connecting to 230v ,12v or 6v
Swagatam says
Make 7 strings of 4 LEDs each by connecting smaller lead of one led to the longer lead of the next led….finally you'll have 7 similar strings of 4 leds which will have a negative and a positive lead terminated at the ends, make all the positive ends common and all the negative ends common. Connect the negative lead to negative of the supply and positive to the positive of the supply. That's it.
Please make sure each string has its own individual limiting resistor….
dilip kumar says
can the leds of 3.2v-3.6v will do in this circuit
plz reply
waiting
thankyou
Swagatam says
Yes it will do.
Sujan Mvsr says
hi.. can i use a 5mm white led's for this project???
Swagatam says
Yes you may use them…
Sujan Mvsr says
hello..i coudnt find some of the values
instead of 1m 1/4 watt i got 1m 1/2 watt
and r3-r7 i got 56ohms 1/4 watt instead of 50ohms 1/4 watt
and c1 i got 104/200v instead of 104/400v
and c2 i got 10uf/450v
are those ok.. if not please suggest me wat to do
i also asked the shopkeeper for c1 if he has 104/600v .. he doest have
Swagatam says
1M, 1/2W is ok,
56 Ohm is OK,
C2 is also OK,
C1 will NOT do, minimum volts should be 250 and above.
Anonymous says
What is the power of this circuit?? How mucs is it brighter as a normal filament bulb??
Swagatam says
2 watts power, equivalent to a 60 watt filament bulb.
Anonymous says
hello swagatam
i m a newbie to the analog world and would like to know the role of each and every component present in the above circuit.
will u please help me out
thanks…
Swagatam says
R1,2 = for surge protection
R0 = for eliminating capacitor discharge shock on the 2-pin when removed from the socket.
D1–D4 = for making AC to DC,
C1 = for filtering the above DC
LED resistors = for limiting current to the LeDs so that they don't get damaged from over current.
Swagatam says
correction.
C1 = for dropping mains current to tolerable limits,
C2 = for filtering rectified DC.
vineesh says
hi,
can you tell me the led specifications?coz many type of leds avlbl now.how much it costs?what is the approx cost of 1mfd 400v ppc?what is the o/p ampere avlbl in this circuit? what is the need of 10mfd 400v cap? pls help.
vineesh says
ok thanks..can i use this circuit to drive a 12v 200ohm relay,using 7812 sir?if not , can you pls suggest a transformerless relay drive circuit plss
Anonymous says
Hi,
I am trying to learn from your blog sir 🙂
Q1. Can I know between which nodes (points) we can connect a relay?
Q2. What would be the purpose of such a connection of relay?
Jay
Swagatam says
Hi,
you are welcome!!
The relay can be connected across the positive and the negative of the bridge.
On powering the relay contacts will operate….that's all will happen, the purpose will depend on the users plans.
Anonymous says
Hi,
can i use 20 pcs of LED to this circuit? 10 pcs for each array.
Thanks
sandeep agari says
the specification of led is 50mA generally, bu you managed 100mA output at leds.. ???
Anonymous says
Hi Swagatam,
C2 and C3 is electrolytic capacitor?
thanks
Anonymous says
In diagram there are two capacitors C1 and C2.
Q1. Both are electrolytic right?
Q2. C1 positive is connected to mains, and negative is to shown point in bridge rectifier. C2 positive is connected to that point between R2 and R3 and C2 negative is connected to point on bridge rectifier. Is that correct?
Q3. What values would change if mains was 110V or 120V? I think R2 will reduce is this correct? Is its value 50 ohms, 1 watt?
Thank you sir
Jay
Swagatam says
please ignore the above comments they were for the earlier diagram.
C2 is electrolytic, C1 is metallized PPC type.
Your second points are correct, but C1 being a PPC cap does not have any polarity.
Yes with 110V R3 can be made less, however noting is much critical.
Please check the parts list for the component values.
Raymond Borowiak says
I bought a corn cob led lamp it won't work on DC only AC, I think because of the capacitor that would block DC. tyvm for sharing merci beaucoup