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hello sir,
i want to make one miniature electic stove so please give me some tips to make it….
waiting for your reply….

HAI IAM BASHA YOUR MADE LONG RANGE FM TRANSMITAR I LIKE IT SO IWANT IT HOW THE PRICE OF THIS CIRCUIT MADE PLEES TELL ME SIR IAM ORDER THIS PROJECT MY NATIVE PLACE IN ANDRAPRADESH GUNTUR JILLA

hello sir iam basha your projects most sinceyarli warking
your 2 to 5 kms fm transmitar project i like it sir so you made this project my adress send me sir this project money i paying sir
please made and send me sir thanq

dear sir

how to make dipawli decoration light cuircut
1. runing light
2. on off light

helow sirr ……I hav got a project on single phase transformer……if u don't mind den can u plz say me abt its construction n components to required to build a one phase transformer……my gmail is pawan.singh2069@ gmail.com

Dear Mr Swagatam, i am an electronics hobbyist and followed your work on this site for some time now. I have learned many things from it and i like to thank you for that. For my next project i like to make an inverter with parts salvaged from obsolete ups's. I have a 2kva transformer, a print board with 16 mosfets PN80NE0 full bridge driven by 2 ic's IR2110. Do you have a circuit with load dependent correction for me that i can use?

Thanks in advance
Best regards,
Gill

Hello Sir
I want to built static voltage stablizer using IGBT, can you help me with some proteus simulation circuits and codes

i want circuit to get DC 100v 350mA from 220vac..sir plz help me… 🙁 …

Can you post new like Led Propeller Clock or Rotating Led Globe it is difficult but very interesting…….

Hello Swagatam –

Your site is very good. Specially for those interested in Electronics & in Building. I have a Little Problem as I am just an electronic hobbyist. I am not aware much about the Components. Can make a Article page on this site explaining in details how to use PCB's, Correct way of connecting LED, Resisters, Diode's, Color Coding of Diodes, etc.

This will help a New Hobbyist to learn a few circuits building. There are many Ready to build kits in the market and we get all the parts mentioned in your blog easily but are struck when we have to make the connections as we get confused as to which wire has to be connected to Positive point or Negative Point. If we connect it wrongly the project may fail and if the project involves main current then the damage may be Great.

Hope you get my point.

Thanks & Regards
Francis

Could you post a circuit on Automatic water plant system…using some relay and transistor…..

I made the circuit "Simple Door Bell Timer, with Adjustable Timing Facility" but it is not working. A few days ago I saw the same circuit in your site with some modification using bel8550 and 8050 transistors with some change. I am confuse that which one is correct and tested o.k. Please clarrify.

Hello sir.
I want to make simple SMPS welding machine for my personnel use .if u have any complete circuit and design please help me.
thanks

Hello sir, I really need your help. Any suggestion of a circuit or electronics components I’ll be needed to build a circuit for an automated conveyor that could detect if the boxes are large, medium or small and sorted them to 3 different directions. The size of the conveyor is 10 inch by 18 inch. By the way sir I’m from Philippines and I’ am a currently second year college student taking up Electronics and communication engineering, and that project was my final requirements for industrial electronics sir. I really hope you’ll respond as soon as you saw this. Big thanks to you sir. Have a good day 

Sir how can i send you a circuit in your email id or what…. I want to send a circuit …..me bhanu

Hi i have a request :D, if it's possible. a circuit for a DRL (day running light.) made with 10 LED white, the circuit for led must be with impulse (impulse control) a potentiometer for frequence control , frequence between (i can see the led blink -and- over eyes can percept). if you have a idee. V=12 V

Hello Sir Can you tell me how many 1 watt LED I can use in series on 12v 500mAh charger usually use for modems etc. Do I need any resistor to do such. Regards

hi Swagatam
i have an ic voice recorder model vr330
at first it was working well
recently it always shut off "battery low" i replaced the battery but no success.. i used lm1117 3.3v but also the same result.. it always tell low battery and shut down..
i checked every single item on the board but didnt find any item harmed
is there any chance that i could fix it ?
thank you

Hello sir,
I need a circuit which will make 12 volt relay initially On, as soon as I trigger, relay should get OFF until I restart the hole circuit. Relay should stay OFF irrespective of thereafter triggering.

Hi,
could you please publish 3 phase regulator rectifier circuit for motorcycle . thank you

Hi,
I need a circuit to start an Electric Generator automatically when power is failure, and then stop it when main power is ON. can you help me? is there any idea based on 555 timer sircuit using SPDT relay.I have a 3KV electric generator with selfstart option.
Thanks.

Hi Sir,
I have gone through your technical review very helpful.

Hi Sir,
I have TVS heavy duty bike and I want to it convers battery I mean how to fix the battery along with please send me the circuit diagram to my mail id ssinnurs@gmail.com

In the https://www.homemade-circuits.com/2012/05/make-this-emf-pump-circuit-and-go-ghost.html how do you wire the cols
Is it a single wire or multiple wires – the coild picture seems to show 3 wired on the lower right coil and only two wire for the other 3 – Where did the third wire come from ?

Sorry for the stupid question I'm a noob

Sir, Can you provide me with a circuit to scare birds circling around our gatherings in park.
Thanks in advance.
E.R.Murthy.

Hi,

Hope you are fine. 🙂

The purpose of writing here is to share with you an idea of a project – to design a "heart rate monitor alarm" which can be made by using commonly available low cost components and which will produce an audible alarm whenever the pulse rate of anyone is found to be abnormal. It should meet the following conditions as well:

a. Compact and light weight, therefore portable
b. Consume minimum power, therefore should run 24×7 for a month or two from a couple of AA batteries or a 9 volt pack
c. Should be fairly accurate in it's performance

I know there are many such circuits available on the net but their performance and reliability are questionable. The unit can be very useful especially for elderly people (with / without a heart disease), for patients who are bed ridden and so on. When the heart either beats at a rate higher/lower than a set average threshold value, the alarm will sound loudly enough to alert people around the patient.

I hope that my proposal is clear to you. However, if you have any doubt, please drop me an e-mail.

Thank you,
Kind regards,
Raj Kumar Mukherji

Hello everyone.

I'm a electronic novice, and would like to purchase a simple timer circuit.

I'm located in Hyderabad.

Thanks..

Sanjeev
email: asanjeevomatic@gmail.com

Dear Swagatam,
I want to design DC to DC converter, Like 18 V from two battery 9V in series, by using I 200 or LM7809 to get 9 Volt with 600 mA, I can get the 9V from regulator, but I can not get 600 mA, How can I get the 600 mA.
Thank you

Dear Mr. Swagatam,

Happy New Year 2015……
GOD Bless You…….

I come from Indonesia…
I am Great fan of you, I like to go through your blogs and also the comments.

So finally I got inspired and start to work on very simple requirement of mine.

Please Help me Sir,
so I Need Timer 3 Hour intervals and now I Have Schematics Two Hours….Can you help us to change its?

Uploading the circuit diagram is not possible here so I have sent it via your email address hitman2008@live.in and homemadecircuits@gmail.com

Best Regards,
Anwar

Hello Swagatam,
I was wondering if you could possibly assist me. on the blogs I have seen some diagrams for simple variable power supplies. Firstly I know very little about electronics, but with a shopping list and a diagram I am sure I would be okay. I would like to build a simple variable power supply with an input of 220/240 volt ac and an output variable voltage of approx. 1.5V to approx. 15V and a variable output current of up to approx. 100A. I have started zinc electroplating as a hobby (have sweaty hands and want to protect all my tools) the chemical company gave me these as a more or less dependant on my zinc plating bath size. At the moment the little 6V 8A Ryobi battery charger works for a few minutes, overheats and cuts out till it cools down again. I would really appreciate any assistance you could give me on this.
Many thanks
Andre

Hi swag, do you know Grid Tie Inverter with Limiter? Can you please design me a limiter that I can connect to any ordinary Grid Tie Inverter? Thanks

Hi Swagatam,
I want to design DC-DC converter using OP-AMP. Specification is 12 VDC input and 48 V DC output. Can you please give some related circuits

hello sir,
i want to make IR based fan regulator with 5 speed fan control it should not work like dimmer as dimmer based regulator make fans to create noise on slow speed. can u plz help me

Sir i am omkar pawaskar
i want to make a wind based mobile charger which can charge my mobile when i ride my bike
m trying this from long but have failed pls guide

omkar pawaskar

Dear Swagatam,
Searching for small invertor circuits i reached this website , i got a 100 watt invertor circuit diagram on this website which uses
4047ic and irfz44n mosfet and successfully got running invertor thank you very much for this.
now on the same lines using this same 4047ic circuit i was trying to develop a smps with higher frequency unlike 50hz above
this time using irf840 mosfet and ferrite core of size 35mmX28mmX12mm primary winding of 300turns and seconday 18turns
i am facing the problem of irf840 getting hot quickly and also this ferrite core transformer making vibrating sound squeaking sound of
the high frequency of about 12khz to 18khz , actually i am not electronic educated but mechanical engg but having very much interest in developing and trying self useful electronic circuits
kindly help me understand what makes mosfet to go hot quickly and transformer making vibrating squeaking sound
thanks
anand

Hi Swagatam,

Nice blog you have, I am actually looking for a transformer less power supply something like mobile chargers but i want to operate relay using it, could you please help me with this. Do you know any place from where i can order these circuits or if i can myself make it at home.
Any help will be appreciated.

Thanks & Regards,
Saiyad Rasikh

hello friend, I am passionate about electronics and also am one of your admirers around the world. I wonder if you have some scheme of some electronic circuit able to control equipment from a distance, via mobile phone, gps, etc, because we need a device on and off the distance that can be locked. If you already have some mounted, I am interested in buying from you if it is not too high. I appreciate the attention, any questions can explain more detailed via Skype If you possess. thank you

hello friend, I am passionate about electronics and also am one of your admirers around the world. I wonder if you have some scheme of some electronic circuit able to control equipment from a distance, via mobile phone, gps, etc, because we need a device on and off the distance that can be locked. If you already have some mounted, I am interested in buying from you if it is not too high. I appreciate the attention, any questions can explain more detailed via Skype If you possess. thank you

Hello Sir
I am working on a project of designing 40W/15V SMPS. I have all schematics of 65W and triple output of 5V, 15V,-15V SMPS. for this SMPS feedback circuit is designed for 5V output. I want design Feedback circuit for 15V output. can you explain what changes i have to make for this and how would i chose parameters for feedback circuit. I am using NCP1203 for switching. My emailid is shefalip.06@gmail.com. Please sir send me your email id so that i could send you all schematics.

hello Swagatam can you help me with a power supply drawing for a grow led light?
direct 220 to a chain of 3 watt led ratio 4 red 1 blue
best regards walter

It looks good that you are doing lots of hard work for all your projects
But i here wanted to you to suggest you to make your website more ineteractive &attractive for the user
becoz if your site will be interactive then people will often like to keep on visiting it's an important aspect with your
toil hard work . Thank U

hello sir this is shubham from maharashtra india,
Sir my question is how general sine wave of a oscillator (consider colpits or hartly oscillator is differ from the sine wave which we use to power all AC powered equipment's. Is this possible that we can make a inverter circuit by using hartly or colpits oscillator, if yes then how? Please give me reply sir. Thanking you

Dear Swagatam,
Greetings of the day.
Can you send me the link of circuits which uses remote bell to energise a relay, making it wireless relay activator.

how to connect LEDs such that it works like a series?

hello sir

I am zulfiqar
I want to make a project which control the the lights, fans (and other appliances that are used in one room)
from the another room .
I have to use two controlller and a single wire communication between them

If i press light button light should be on of other room and i press fan button fan sholud be on
I have to controll the 8 things using two controllers

Kindly help me in makin my project I will be greatfull to you

Hi again ,
thank you for all help you providing 🙂

i think this circuit could be useful and after searching many sites i could not found a good circuit !!!

i need a circuit which get 2 input for 12 volt DC 5 AMP power supply , and give one them in output ,
if primary power supply fails , secondary power supply take the action , something like Redundant Power Supply,

to my knowledge we could do it in 2 way
1- ORing Diodes
2-Fets

would you please design a circuit like that ?

I'm trying to make a circuit that will turn on them off a pair of 12v pumps in sort of a heart beat pattern, repeatedly. U haven't come closer. Any way you could help me with this?

I'm trying to make a circuit that will turn on them off a pair of 12v pumps in sort of a heart beat pattern, repeatedly. U haven't come closer. Any way you could help me with this?

Dear Sir, can talking circuit be made eg it speaks "Welcome" running on 12 volts.
Thanks

hello sir ,this is vinod from mussoorie near dehradun.i am not an engineering student,but i have lot of interest to make different electronic items . sir i would like to know that is it possible to use usb drive in normal tv without hdmi and usb port, by putting some type of converter in between them.if yes please tell me the circuit diagram .

hi sir i can you please design a circuit which will output 9v dc from a 12v battery efficiently . it can be by using ic 555. this will be use to run a rc toy car using 0.8A max. if possible can it be a variable output voltage dc. i have a 2n3055 transitor ,MJ11015 TRANSISTOR.

Hai Sir, this is Swetha…, Am persuing Btech final year. Want to do live project. I want Gravity Light project. Can you please send circuit diagram and report please. swetha.bindhu403@gmail.com

Iwant to make my own polybag sealer can you give circut of this

Hello Sir

This Is Aravind Sir

I Like To Know How To Make A Transformer And Its Calculation And I Google It But I Cant Find The Proper Calculation Method And I Find Around 7 Method Of Calculation But Its Not Proper With Manufactures Standard And Can You Please Help Me To Know It Sir

Thanks You

This is just a simple question :
Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences?
What is the difference in the charger circuit in both case?

dear sir, i will enough grateful to if you can provide me the complete circuit for e rikshaw with solar system alongwith complete electronic component value, please send it to amit46vm@yahoo.com/gmail.com
regards
amit

Dear swagtom sir! I have heard that we can communicate by intercom using main ac power line home to home , i need communicate with my friend , there is about 3km-4km between our houses, but our ac power line is same, can you give me circuit communicate with him? please!

please sir i want talk to you over phone is it possible? my mail address is

ravishimla1965@gmail.com

i need to assemble variable frequency(a pot can be use on output of 555 for variable amplitude) square wave funtion generator with frequenciies 1 Hz to 1MHz ,flexibility to vary amplitude of output ,555 should be used in astable mode and axact 50% duty cycle can be obtained on output plz help me sir in desining the above circiut i will be highly thankful to you

Sir your projects are really great but I am a student of class 10 sir can you help me with a idea of creating a project for science expo.

Hi,

I would like to convert ATX power supply to a variable power supply, can we do it ?

Hi I need a Nokia Mobile battery( 3.7v) driven simple Bluetooth stereo amplifier circuit diagram.Please develop it.

Sir, plz help me in making a circuit with following details. A 12 V relay is to be connected such that a momentary push switch turns it on BUT but after release of switch the the relay should not turn off immediately, rather it should turn off after some time say roughly 1minute. Thanks

Hi Swatagam!
I would like to know if you could make a circuit that can activate a 12V 600ma stepper motor for 10 or 20 seconds every 3 hours or so. is that posible?
Kind Regards,
David Montenegro

Hi Mate,

I am designing a Spot welder Controller with an Arduino and there is a need for a in rush current limiter. Would it possible for you to design the "In-rush-Current-limiter" i have read that it can be done in several ways. I will be using this to drive a Microwave oven transformer modified by rewiring the secondary to 3 turns of 3AWG wire for spot welding 18650 cells.

Hey mate,

Would you be knowing the circuit for a zero cross detect for a transformer ?

hello sir,

i really liked the way you reply to queries and your good heart of sharing. May God bless you.

please sir, am working on a project titled "remote controlled DUAL BAND MOBILE PHONE JAMMER"
i hae tried searching for a working circuit diagram but hae been able to find one. please i will appreciate it if you could be of help. thank

johnson

Dear sir, i am very fond of u, by u i love electronics, u r really genius, u made electronics very simple.
Sir i would like to request clap switch and timer circuit for 8 volts led bulb which remain on for a long time
Please help me to solve the circuit.
Thanking u
Yours

Hello,

I love your website! I was looking at your circuit "twin or split battery charger" and I don’t see a value for the resistor between pins 1 &3, 7&5 for the LM358 is it 1k? I’m going to make a printed circuit board of this design using photo etching.

My goal is to build a circuit that will charge one battery while running off another battery and when the run battery falls to a certain voltage level, switch to a charged battery. I am not looking to make an over-unity device; I am interested in experimenting with energy recovery to create long pulse motor run times. I expect the system to eventually die out but I want to see how long that process will take using air coils and back emf harvesting.

Would this circuit work if I replace the batteries with two 100F 2.7v supercaps? Since the caps charge faster than lead acid batteries, this may help the efficiency of energy recovery during the run time windows.

I love building things and your awesome ability to design such cool circuits makes people like myself enjoy hours of building these cool circuits and watching them come to life.

Hello Swagatam. I was thinking about put a sensor on the gasoline line from my motorcycle tank, near top, between the tank and the carburetor, that would consist of a pair of (innox?) leads like some mm separated from each other. This would detect the electrical conductivity inside the line, in direct contact with the fuel and while there is gasoline wetting it, it would output 0 volts, and when not (i.e. gasoline is ended and the line is becoming empty from the top), it would output positive (12v?) so I could light a warning light on the dashboard to avoid getting engine cut on a sudden. I can quickly turn the valve from to reserve position in this case. So when sensor wet, 0V(0); sensor "dry" 12V (1). What do you think? Thanks Sir.

Hi Swagatam I am a fan of ur work..
I need a help.
My laptop and mobile over charges each night.
I want to creat a circuit that can start supply at desired time later i.e that 2 or 3 or 4 hrs later and supply should should be ON again for desired time .
I would have to enter how much time later Supply will be on and off..

Thnx man, Your work is really great.

Please inform me if you are working on this project.

Dear Mr.Majumdar, I am Kamal Kumar from Chennai.
I hope to find a good circuit for a battery eliminator with output dc power ranging from 1.5 to 12 or 15V and with its PCB design etc. can you kindly give me the same I will be very thankfull. I have searched every where on the internet but nothing seems good for what I am looking for. Thanks in anticipation.

Dear Mr. Swagatam Majumdar,

My name is Srinivas Chakravarthi & I am working on Electro-Chemical project, for my lab work, I need an Universal Power Supply (AC/DC) with variable Voltage, variable Current & Time controlled Polarity Switching.

My requirements are:

Variable Voltage 0-100 (V),

Variable Current 0-100 (A),

AC or

DC with or without polarity Switching (1 to 10 minutes variable).

If you can make one such universal power supply unit, I shall be very much grateful to you.

Thanks & Regards,

P.Srinivas Chakravarthi.
09440840989.
Vijayawada,
Andhrapradesh.

Hi Swagatam,

I need a countdown timer with a relay which can be set to 1 to 5 minutes.
I would like the timer to show the preset time on 7 segments e.g. 3 min. = 180 or 3.00
When the time counts the 7 segments shall show the remaining time.
When the time is up the relay must switch off.
I don’t have Arduino and no skills in PIC programming yet.

Can you help me out with a circuit / schematic?

Thank you in advance,
Henrik

220v Ac COB 5w(5A) Led is getting excessive heat after connection. Also not lasting. How can I solve this problem???

Hi,
I recently by mistake bought LED bulb(Great Value) from South America which is 110V. But I want 220V LED Bulb as I'm in Sri Lanka. Now I'm trying to do some modification on LED driver. Please help me to do this & Fix this bulb to use from 220V. Which parts need to change on the driver ?

Hi Swagatam,
This is RSBirman.
Do you have any circuit which indicates open earth and has a NO/NC relay contacts which can trip the contactor if the earth is not connected and this will avoid the instrument from getting on.
The sensitivity should be adjustable.

i like to build led sign but i have small knowlege with the pic16F And attiny 2313 That i try to study them. I asked my friend to help me because he has many knowlege in electronique than me.
My dream is to drive many leds on one pin µcontroller. But i can't make it now.
Perhaps swagatam will help me to solve this problem,thanks a lot for your good site.

HI SIR,
I NEED 3PHASE VFD CKT

I want to make a led lighting circuit which will show the blood flow of human heart including open close indication of valve. Can you help me to do this project providing circuit diagram and details . I want to use 230 v ac supply for input. Kindly reply me in my email id uniqash@gmail.com.

Hello Sir

Do you have schematic of electric bike especially brushless motor and controller , how can i make a ebike for my self

thanks

Hi sir i need a ckt for a present. Would you plz make a ckt for me

HI Sir
Thanks for this valuable blog.
can you post a brushed DC motor speed controller circuit up to 10 HP

hi sir
thanks for this valuable blog
please post a Brushed DC motor speed control circuit up to 10hp

Hello Swagatam,

I would like to meet you and discuss projects for welding machine. I am Mumbai based. My phone – 9820212263.

Any time will be convenient to me. Please reply.

Much awaiting,
Nishant

Hello sir,

I want to make 3RCA TO 6RCA Female cable and 3RCA TO 3RCA+RJ45 Female cable. Will you please provide me circuit for it. Pls do the needful

Thanks
Amandeep