An efficiency of around 85 % and a power output of more than 200 watts is what you will get from the present design of a power inverter (home built). Complete circuit schematic and building procedure explained herein.
Introduction
You might have come across many articles regarding power inverters, however you might be still confused about making a power inverter? The present content provides a complete building tutorial of a home built power inverter.
If you are planning to make your own low cost and simple home built power inverter then probably you won’t find a better circuit than the present one.
This heavy duty, easy to build design includes very few numbers of components which can be found readily available in any electronic retailer shop.
The output of the inverter will be obviously a square wave and also load dependent. But these drawbacks won’t matter much as long as sophisticated electronic equipment are not operated with it and the output is not over loaded.
The big benefit of the present design is its simplicity, very low cost, high power output, 12 volt operation and low maintenance. Besides, once it is built, an instant start is pretty assured.
If at all any problem is encountered, troubleshooting won’t be a headache and may be traced within minutes. The efficiency of the system is also pretty high, in the vicinity of around 85% and the output power is above 200 watts.
A simple two transistor astable multivibrator forms the main square wave generator. The signal is suitably amplified by two current amplifier medium power Darlington transistors.
This amplified square wave signal is further fed to the output stage comprising of parallel connected high power transistors. These transistors convert this signal into high current alternating pulses which is dumped into the secondary windings of the power transformer.
The induced voltage from the secondary to the primary winding, results a massive 230 or 120 volts conversion, as per transformer specifications.
Let’s study in details how the circuit functions.
Simulation and Working
The circuit diagram description of this home built power inverter may be simply understood through the following points:
Transistor T1 and T2 along with C1 and C2 and the other associated parts forms the required astable multivibrator and heart of the circuit.
The relatively weak square wave signals generated at the collector of T1 and T2 is applied to the base of the driver transistors T2 and T3 respectively. These are specified as Darlington pairs and thus very effectively amplify the signals to suitable levels so that they may be fed to the high power output transistor configuration.
On receiving the signal from T2 and T3, all parallel output transistors saturate well enough according to the varying signal and create a huge push pull effect in the secondary windings on the power transformer. This alternate switching of the entire battery voltage through the windings induce massive step up power into the primary windings of the transformer producing the desired AC output.
The resistors placed at the emitter of the 2N3055 transistors are all 1 Ohm, 5 Watts and has been introduced to avoid thermal runaway situations with any of the transistors.
PARTS LIST
RESISTORS ¼ WATT, CFR
R1, R4 = 470 Ω,
R2, R3 = 39 K,
RESISTORS, 10 WATT, WIRE WOUND
R5, R6 = 100 Ω,
R7-----R14 = 15 Ω,
R15 ----R22 = 0.22 Ohms, 5 watt (can be connected directly if all the parallel transistors are mounted on a common heatsink, separate for each channel)
Capacitors
C1, C2 = 0.33 µF, 50 VOLTS, TANTALLUM,
Semiconductors
D1, D2 = 1N5408,
T1, T2 = BC547B,
T3, T4 = TIP 127,
T5-----T12 = 2N 3055 POWER TRANSISTORS,
Misc.
TRANSFORMER = 10 to 20 AMPS, 9 – 0 – 9 VOLTS,
HEATSINKS = LARGE FINNED TYPE,
BATTERY = 12 VOLT, 100 AH
Inverter Building Tutorial
The below given discussion should provide you with a detailed step wise explanation regarding how to build your own power inverter:
WARNING: The present circuit involves dangerous Alternating Currents, extreme Caution is advised.
The only part of the circuit which is probably difficult to procure is the transformer, because a 10 Amp rated transformer is not easily available in the market. In that case you can get two 5 Amp rated transformers (easily available) and connect their secondary taps in parallel.
Do not connect their primary in parallel; rather divide them as two separate outputs (See Image and Click to Enlarge).
Next difficult stage in the building procedure is the making of the heat sinks. I won’t recommend you to fabricate them by yourself as the task can be quite a tedious one and time consuming too. It would be rather a better idea to get them ready made. You will find variety of them, in different sizes in the market.
2N3055 Pinout Diagram
Select the suitable ones; make sure that the holes are appropriately drilled for the TO-3 package as shown in the figure. TO-3 is the code to recognize typically the dimensions of power transistors which are categorized in the type used in the present circuit i.e. for 2N3055.
Fix T5----T8 firmly over the heat sinks using 1/8 *1/2 screws, nuts and spring washers. You may use two separate heat sinks for the two sets of transistors or one single large heat sink. Do not forget to isolate the transistors from the heat sink with the help of mica isolation kit.
TIP127 Pinout Diagram
Constructing the PCB is just a matter of putting all the components in place and interconnecting their leads as per the given circuit schematic. It can be done simply over a piece of general PCB.
Transistors T3 and T4 also need heat sinks; a “C” channel type aluminum heat sink will do the job perfectly. This is can also be procured ready made as per the given size.
Now we can connect the relevant points from the assembled board to the power transistors fitted over the heat sinks. Take care of its base, emitter and the collector, a wrong connection would mean an instant damage of the particular device.
Once all the wires are connected appropriately to the required points, lift the whole assembly gently and place it on the base of a strong and sturdy metallic box. The size of the box should such that the assembly does not get crammed.
It goes without saying that the outputs and the inputs of circuit should be terminated into proper socket type of outlets, to make the external connections easy. The external fittings should also include a fuse holder, LEDs and a toggle switch.
How to Test
- Testing this home built inverter is very simple. It may be done in the following ways:
- Insert the specified fuse into the fuse holder.
- Connect a 120/230 volt 100 Watt incandescent lamp in the output socket,
- Now take a fully charged 12V/100Ah lead acid battery and connect its poles to the inverter supply terminals.
- If everything is connected as per the given schematic, the inverter should instantly start functioning illuminating the bulb very brightly.
- For your satisfaction you may check the current consumption of the unit through following the simple steps:
- Take a digital multimeter (DMM), select 20A current range in it.
- Remove the inverter fuse from its fuse holder,
- Clip the DMM’s prods into the fuse terminals such that the DMM’s positive prod links with the battery positive.
- Switch on the inverter, the consumed current will be instantly displayed over the DMM. If you multiply this current with the battery voltage i.e. by 12, the result will give you the consumed input power.
- Similarly, you may find the output consumed power through the above procedure (DMM set in the AC range). Here you will have to multiply the output current with the output voltage (120 or 230)
- By dividing output power by the input power and multiplying the result by 100, will immediately give you the efficiency of the inverter.
- If you have any questions regarding how to build your own power inverter, feel free to comment (comments need moderation, may take time to appear).
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Vinod kumar says
Can I use C1 and C2 elctrolitic capacitor
Swag says
yes you can, but 0.33uF is mostly non polar, unless it is a tantalum
Vinod kumar says
Please give the value of R15. to. R 22
Swag says
Vinod, you may connect the emitters directly with the ground if you use a common heatsink for the transistors on each channel. Meaning mount all the transistors from left channel on one common heatsink, and similarly mount all the right side transistors on a single common heatsink. Don’t use mica isolator for the transistors because since all their collectors need to be joined together so can be shorted through the heatsink
youngking says
Sir, thank u for ur response.remain bless
youngking says
how are u doing, sir pls is about the 200va square wave inverter my question is about the component u listed
1. resistors R1,R4,R3,R2 . U said is half watt, CEF
2.CAN U xplain what u mean by 10watt wire wound resistors and CEF as well
3. the trans4mer 5 amps what is the rating like u rated 10amps as 9-0-9volt
4. the xternal fittings should include a fuse holder, leds and atoggle switch, should this be connected at the output of the inverter ac pls xplain
Swag says
1) Those are CFR type meaning carbon film resistors.
2) 10 watt is the power handling capacity of the resistor, wire wound means that these are not CFR based rather made by winding steel wires inside.
3) the 5 amps will be also 9-0-9V rated
4) the external fittings are optional, include them as per your preference…
Elias Chibalo says
Mmm in my country its difficult to access that and I think that might be an expensive device.
Elias Chibalo says
Ok I designed astable multibrator circuit but I don’t know the waveform so what can I do to know it
Swag says
you must use an oscilloscope for that
Elias Chibalo says
Am interested with this page but am new in electronics I know little about it. Can I gate help here?
Swag says
you can ask the questions, I’ll try to help
Muneeb Ph says
#sir which devices are work in this inverter?
#If fan will work how much hour?
#If I can use computer ups transformer?
#If I can increase wattage by adding transistor more?
#Any problem with square wave?
Thank you sir
Swag says
All equipment will work with this inverter, but it is not recommended for sensitive electronic equipment because it is a square wave inverter.
computer transformer cab be tried.
you can increase wattage by adding more transistors
Solomon says
Hello sir pls what is the function of T3 and T4
Swag says
T3, T4 amplify the oscillator current so that the output power BJTs can be driven optimally
Solomon says
Be patience with sir, i meant i want to modify or convert the same square wave circuit to sine wave by adding sg3525 to the circuit
Swag says
SG3525 cannot be used for making a sine wave inverter, because it does not produce anything related to sine wave
Solomon says
Hello sir, pls where is the square wave output and the pwm output in the circuit
Swag says
solomon, PWM is not there, only squarewave output is generated from the central Transistor stage
Solomon says
Pls explain more, which of the transistor
Swag says
T1, T2 generate the square waves.
Solomon says
Ok, thanks, sir i want to use the same circuit to modify it to sine wave using ic sg3525 and some other components, please i need tutorial for that, or please i want you to design me the modified circuit using the same circuit. Thanks
Swag says
Solomon, sorry I did not understand your requirement properly, which inverter do you intend make, the above one or by using a SG3525? and which one do you to be a sinewave?
Solomon says
Hello Sir, Pls How Can I Modify The Circuit To Sine Wave
Swag says
I have already answered
Solomon says
Hello Sir, What Is The Maximum Power Of The Circuit
Swag says
solomon, power will depend on how you select the specifications of the trafo, battery and the transistors….
Solomon says
Hello Sir, Pls I Have Some Question To Ask. 1. What Is The Maximum Power/wattage Of The Inverter, 2. Can I Reduce The Number Of Power Transistor And Use Low Capacity Battery? 3. Can I Change It To Sine Wave, If So, What Is The Suitable Component To Use Instead. Thanks
Swag says
if you reduce the transistors then its power handling capacity will also decrease..for sine wave conversion you will have to implement the following concept:
https://homemade-circuits.com/2013/04/how-to-modify-square-wave-inverter-into.html
Anonymous says
What the Substitute for Capacitor Tantalum also Battery 12v 100AH ?
bashir abdulkadir says
Do you mean that if my inverter battery is 12v i should replace it with 18v solar panel,?? and also if my inverter is 200 watt, the solar panel also must be 200 watt??
Swagatam says
yes that's right!
bashir abdulkadir says
Sir how do i change this inverter to solar inverter
Swagatam says
replace the battery with a solar panel having voltage at least 6V higher than the inverter battery spec, and a couple of watts higher than the inverter transformer wattage.
Krishnan Munuswamy says
Dear Swagatam Majumdar, I am Krishnaa – From Chennai.
If I use Two 10000MFD capacitors across 12-0-12 side of transformer What will happen?
Can we get smooth 230VAC waveform at output?
Please clarify, My Email ID is "krishnaa_m@hotmail.com"
Swagatam says
Dear Krishnan, that won't help, instead you can connect both the the capacitors together right across the battery terminals, this will help to reduce harmonics and ripples within the circuit and ensure a much cleaner 220V output…however all these remedies will not keep the 230V constant because the 230V is directly dependent on the battery voltage which will keep dropping with time.
Divya Alla says
Hi,sir
what is the substitute for diode 1N5408
Swagatam says
Hi Divya, you can try for any other similar 3 amp/1000V or 3 amp 300V diode….but according to me 1N5408 is the most standard and widely used part.
Unknown says
Sir ,
I read all blogs ,I have 12-0-12 transformer ,shall i used in your circuit ,it is 4 ams .how much load can be handel?
Shrikant Nikam says
Thanx sir ,
I made it & works fine. 🙂
Swagatam says
you are welcome Shrikant
Shrikant Nikam says
For power transformer what is turns ratio?
Swagatam says
you will have to get a made-to-order transformer, or use any standard 9-0-9V/220V/15amp step down transformer…making it at home can be difficult
Shrikant Nikam says
Thanx for reply sir, can I use TIP3055 instead of 2N3055.& can I use two 7ah battery in parallel connection..
Swagatam says
Hi Shrikant, yes you can use TIP3055 instead of 2N3055
Shrikant Nikam says
can I use 12v 7ah battery for this inverter?
Swagatam says
No you can't
Subhankar says
Hey,
i have an 150ah lead aside battery and,one ups 600va e184736 transformer,can you please tell me what type of inverter circuit should i do?
Swagatam says
you can probably try the following circuit:
https://homemade-circuits.com/2015/05/simplest-pwm-modified-sine-wave.html
Dipak Karn says
Hello sir..
This is dipak i am confused here in charging system is they ckt charge battery automatically
Swagatam says
hello dipak, no the above circuit will not charge the battery…the battery will need to be charged separately using a separate charger circuit
Quentin Freimanis says
the parts list dose not mach circuit
Anton T says
a few questions, how are you connecting the power transistors to each other? then to each end of the transformer (1 wire to one set of 4 other wire to other set of 4) couldn't you just use the heat-sink aren't these npn power transistors? according to your symbol they are so all of their bodies are connected together. what do i search to get the correct transformer? i cant seem to find 12-0-12 10 amp to 220v ac unless this is a step down transformer in reverse? my only electrical shops are ebay or jaycar.com.au It's my first time using transformers. Lastly you said about the 1 ohm 5 watt at the emitters of the power transistors, are they 10 watts or 5 you said 5 at the intro but commented to someone 10 watts or does it no matter for this circuit?
great circuit otherwise just needed more info in its' description
Swagatam says
The transistors are connected as they are shown in the diagram, click the diagram to enlarge for getting a better view. one common heatsink is used for all the transistors on each channel, meaning two separate for the two channels, if a single common is used it would create a short circuit.
The emitter resistors make sure that the transistors conduct uniformly so that all dissipate evenly.
The wattage of the resistors will depend on the battery AH and transformer amp rating, if its above 40AH and 5amps respectively, the 2N3055 base/emitter resistors will need to be upgraded to 10 watts, for lower wattage a 5 watt would suffice.
Ideally a 9-0-9V/10amp transformer is required, and it'll be a step down type used in reverse for the inverter application
Anton T says
Great! thanks for the extra info. So the heatsink can actually connect the 4 power transistors collector (body) to each other for the 2 sets and would this shock you if you touched the heat sink? that's probably why I can't find the right transformer. and to use a transformer in reverse; E.G. 240ac input 12V DC output would be connect battery to the 240ac input side and the 12V dc output side now becomes 220v ac? please let me know how to use it in reverse.
otherwise Great circuits, keep up the good work.
Swagatam says
That's correct, all transistor collectors of the respective channels join together through the heatsink and connect with the relevant transformer outer taps.
As for the transformer, the winding rated 12V connects with the battery side that is with the 2N3055 collectors….while the 220V side becomes the output for operating the appliances.
Anton T says
Thanks heaps! I've bought all the stuff now including heat sinks and case, all I need now is the transformer, it's proven difficult that they don't sell many 10 amp transformers in Australia and when I do find them they are $30+ :/
Swagatam says
great, wish you the best!
Quentin Freimanis says
can this transformer work www.mpja.com/images/7846-large.jpg
Swagatam says
yes will do, but preferably it should be 9-0-9V, not 12-0-12V
Quentin Freimanis says
can 0.47mf work 50 volt
Swagatam says
yes will do, but make R2/R3 = 33K
Akhilesh H.N says
I’m very happy to see you projects thank for this wonderful site
I’ve got a doubt I’ve seen some 8 pin transformers in inverter circuits whatis that how do i test it and know its ratings.
Swagatam says
Thank you!
The pins could be the terminals corresponding to particular winding of the transformer. These winding could be connected with a particular inverter circuit for the intended specific safety functions and other similar things.
Anonymous says
Hi swagatam you are really a great one….
Swagatam says
thanks!
bilal jamil says
Hello Sir,
Thanks for your reply.Kindly send me simulation as soon as possible.
Regards,
My email:bilaljamil1992@gmail.com
Swagatam says
I am sorry, I am not getting time to do it….
Anonymous says
appreciated your efforts Mr. Swagatham
bilal jamil says
Hello Sir,
I have problem regarding Transformer used in the above circuit..I just wanted to simulate it on Proteus ISIS but i don't know how to connect transformer.can u send me a simulation of this circuit.I just need it for verification and to do some changes.I know it would take your precious time but really! really! need it.Please send me its simulation done via any software preferably by Proteus ISIS(any version)
Regards,
My email:bilaljamil1992@gmail.com
Swagatam says
Hello Bilal,
I'll try to do it if it's possible…
sneha karki says
hello swagatam,,,i want more escrption about the working of inverter cause i'm gg to prepare a project report s can u help me in finding?
Swagatam says
Hello Sneha, as you can see i have explained everything in the article….however you can specify your questions, i'll try to explain.
kushal singh says
sir…i am an engg student of elctrical and elex branch…..i want to build a 300 va or around so that a fan and a tubelight can be swicted ON……what are the components required & neccesary guidlines for its construction is required…..plz help sir…..thanks….plz email me at : kushalsomvanshi@gmail.com……thank u sir….
Swagatam says
you can try the following circuit:
https://homemade-circuits.com/2012/09/mini-50-watt-mosfet-inverter-circuit.html
vineetha says
please explain me about switching SPDT relay through opto coupler output. ASAP
Swagatam says
I'll try to produce it in a new post soon.
ananda says
the circuit you have given, could you please confirm, it could work with solar panel based chargers for charging battery of 200va, and what other care should be taken
Swagatam says
The circuit is a confirmed one, it will work with all DC power sources as long as the voltage is maintained around 12V.
Anonymous says
Sir my name is umeh Cyril, an electronics ENGR. Student from Nigeria; I want to ask if it is ok to use a 14-0-14volt transformer inplace of the 12-0-12 volt.
Swagatam says
Hello Umeh,
That would give a reduced output voltage….around 160V
Anonymous says
Hello sir its me mark, sir regarding the 500 watt inverter sir is diode 1N414B and diode 1N4148 are they both thesame?im just curious.. And my second question sir is the resistor with no exact wattage,what will be possible exact wattage i will use in order to make it work perfectly? About the DX2A diode it is possible that there are diode namely DX2A? I hope you answer my question im just curious and still not enough knowledge in electronics..thanks..always keep safe wherever you are.you are a good person bec. You share your knowledge unlike others..peace..
Anonymous says
Sir its me junver again,can the above circuit modified to 500 watts? It it could be modified,how? Thanks
Swagatam says
Yes it can done, replace the transistors with mosfets.
Anonymous says
sir this is mark sir my question is regarding this circuit sir www.eleccircuit.com/12-volt-to-220-volt-inverter-500w/ what is DX2A? what does it mean? what will be the exact diode of the diode DX2A? and what will be the replacement of diode 1N414B coz 1N414B is not available in our area…. thanls for speed reply…. thanks a lot…..may GOD bless you happy new year sir swagatam….
Swagatam says
Hi Mark,
Use 1N5402 for DX2A and 1N4007 for 1N1448…these will easily work.
Happy New Year to you too!
Anonymous says
sir its me junver can the above circuit power up tv 60hz 85 watts? and a 20 watts cfl light? sir are you sure this circuit will work or function? have you already test it by your self coz im planning to make the above circuit thats why im asking you coz it will cost a lot here in our area philippines….
Swagatam says
Yes this circuit is tested and it is capable of handling up to 200 watts.
For 85 watts you may try the below given circuit, it's also tested:
https://homemade-circuits.com/2012/07/simplest-and-best-100-watt-inverter.html
BIN ALIYU says
Is there eney indication for the Base& Emeter by the manufacturers for the 2n3055 transistor?
Swagatam says
You may check the 2N3055 datasheet to confirm it.
Anonymous says
Hello sir swagatam im mark.can i ask you a question about the diode substitution..what is the substitution of a diode 1N414B and a diode DX2A? Thanks for speedy reply..
Swagatam says
Hello Mike,
1N914 is one good equivalent of 1N4148,
No idea about DX2A
GMagoon says
Hi Swagatam, I have this old Microtek Inverter (600W) that keeps switching between charged and charging and is not stable. Could be issue with relay? Any ideas where I could find its schematic for repairing purposes? Thanks. Would the above schematic also be similar to what it is inside? Waiting for reply thanks.
Swagatam says
Hi GMagoon,
Inverter circuits can be hugely different from each other with their configurations, so it is almost impossible to diagnose the fault without checking it practically.
I think the issue can be with the preset controls whose contacts might have got corroded, still it cannot confirmed without actually seeing it.
Regards.
GMagoon says
Hi. Thanks for the reply. Do you however, have any idea where I may find a schematic for a inverter anywhere? Thanks 🙂 Just need a schematic for reference atleast. Thanks.
Swagatam says
Hi,
There are hundreds of different inverter schematics online based on a huge number of different specs….so it's very difficult to pick the right and the most appropriate one from them:)
GMagoon says
Hi, thats understood but could you kindly atleast provide me with a starting point / website? Thanks bro 🙂
GMagoon says
Thanks. Maybe I should consult a text book instead.
GMagoon says
This is the kind of inverter I have: img841.imageshack.us/img841/9602/microtekinverter.jpg
Swagatam says
All brands have their own specific circuit diagrams and specs…
Anonymous says
Sir its me junver i already made one of your inverter the simplest it works great it drives 2 cfl 18 watts thats why i decided to make the above circuit because i trust your circuit design..my question are about the above circuit,can it drive 5, 25watt cfl light connected in parallel?can it also drive a celfone charger 50-60hz? This circuit will not work in t.v am i right? But i will make it because in our area black out is always our problem.plese reply asap.thanks for sharing your knowledge…sorry for my english,im not good in it. Peace.may the creator bless you.
Swagatam says
Hi Junver,
Though I cannot guarantee, I strongly believe the above design will work perfectly according to your above needs.
It will also drive a cell phone charger.
Regards.
Anonymous says
sir this is junver can i use 250v/a transformer in this circuit?thanks.
Swagatam says
Hi Junver,
yes you can use it.
Jithin p s says
will there be any problem during charging is their a need for external charging circuit
Swagatam says
Charging will need to done after removing the batt from the circuit and through an external suitable charger…
Jithin p s says
i have a v guard 600va ups can i replace its battery with a 65AH battery and use it as an inverter
Swagatam says
If the external battery voltage is same as the UPS battery then you can use it.
Vinod KC says
Hi Jithin,
I think your idea may be a little bit dangerous. Because the charger in 600 VA ups is limited to charge the inbuilt battery. So you cannot charge a huge current battery with that charger circuit.
Anonymous says
Sir, is it possible to do this project around $25, because the 100Ah battery would be a costlier one?
Swagatam says
At the present time it will be difficult because the prices have risen a lot….
Deiva Nayagam says
I like this page
Swagatam says
Thanks!!
KIRAN RAVIPUDI says
sir,
can u say how can this circuit works
and can i try it on bred board
Swagatam says
No, I am sorry you cannot do this on breadboard.
KIRAN RAVIPUDI says
hi
this is kiran
in the above circuit what happen if i remove t5 to t8 and t9 to t12
Swagatam says
Hi,
If they are removed the transformer will not get power and there will be no output…
Anonymous says
How much it costs?
Swagatam says
around $25
Humayun says
Swagatam my teacher asked me to make an inverter around 100VA. I need a simple circuit including battery 12v 7.2AH and 2N3055 transistor and 12-0-12 10 Ampere transformer because i have purchased these things. Can u please design a circuit including above things.I have to submit it in next week so do in hurry.
Humayun says
Hello Swagatam i have got a battery of 12v 7.2AH can i use for above circuit testing…
Humayun says
Can i use the small connecting wires used for bread board in inverter circuit….
Humayun says
Brother Can i use the Ac-Dc Adapter spec..12 V 500mA max.. instead of 12 v battery just 4 testing…reply fast
Humayun says
Brother i wanna make it on vero board plz tell me about the connecting wires for the inverter circuit(Size)etc…
Humayun says
IS there no need to fit into heat sink( T9-T12) power transistor…plz reply fast
Rose says
is c2 is connected to both R4 and R6……
Humayun says
100 AH battery is expensive plz tell me any other battery useful for this circuit
Humayun says
Actually i know a little basics of electronics,that's why i was asking for it.. Can u plz elaborate how to fit the transistor in heat sink and plz tell me how to ground a electronc circuit component for example battery, trnsistor etc…
Humayun says
Sir i wanna build this inverter can u plz upload the making of this inverter….This will help me a lot…
Shahjee says
I have made but the output volts vary from 0 to 40V for only 1 second and become 0V, i am not getting a fix 220 voltage. what could be the problem?
Anonymous says
sir please help me what kind of resistors to be used in place of R15-R22
Anonymous says
I have made but it's not working, i have put all things but result is zero. what to do?
Shahjee says
Can i use D313 or D331 instead of bc547? and both can be different, can i use in the circuit?
Shahjee says
how can we set the frequency? or would be a fix frequency of it?
Shahjee says
Can i test it by generator dc source?
Anonymous says
and for testing purpose, can i test on project board and is there necessary to fix power transistors on heat sink?
Shahjee says
somewhere i saw, washer use for transistor to fix in heat sink and is there not use of IC CD4047, if we are getting voltage from battery and can i test it by power supply?
Anonymous says
Do not forget to isolate the transistors from the heat sink with the help of mica isolation kit.
This sentence, i did not get, please could you help me in this, how to connect? because i have only a heat sink and has 8 holes for 8 transistors, so should i cut it into two parts for fixing 4 transistors or remain as same and what about mica isolation kit?
Anonymous says
T1,T2 npn and T3,T4 are pnp. am i right?
and battery's +ve wire is going to power T and -ve is going to pnp T emitter?
Anonymous says
can i make 200va inverter by using this circuit?
SHAHJEE
Trisom Sahu says
Hi swagat
can i connect a load of 300W to this inverter??
Trisom says
swagat,
plz tell me wat should be the design if i want a 300W output and which last for a minimum of 5-6 hours??
Nemwel -Kenya says
Hi swag,can the ordinary stepdown transformer be used as a step up for inverters by connecting the signal back from the secondary?
Anonymous says
i know nothin abt phy nd chem….can i make an inverter?? pls help