Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine

The post explains how to make a pure sine wave inverter using ordinary components and yet get reasonably outstanding results.


The circuit basically uses a push pull topology through a couple of 24V batteries. The use of two 24V batteries allows lower AH batteries to be incorporated with higher efficiency and wattage.

12V batteries can be also tried however the power output would be reduced to half.

Since a dual supply is used the connected transformer does not need to be a center tapped type, rather a two wire ordinary transformer becomes suitable here.

The couple of designs shown below are all that would be required for implementing this simple pure sine wave inverter circuit.

The first circuit is the basic sine wave generator which  becomes the feeding input to the main sine wave amplifier or the output stage.

The sine wave generator produces a pure sine wave output with the shown components at about 50Hz, for other frequencies the 2.5K resistor may be altered, and tested in a simulator for fixing the desired results.

The sine generator circuit should be supplied with +/-12V, and not directly from the 24V battery supply as that might damage the IC permanently.

The opamps used in this sine generator are from the IC TL072

The next diagram shows the output stage of the proposed simple pure sine wave inverter circuit. As can be seen the design is not at all complicated.

All the involved components are standard, and easily available.

The mosfets are IRF540n and IRF9540n which compliment each other to produce the required push pull effect over the attached transformer.

With a 0-24V/25amp transformer, and a couple of 24V batteries  the circuit would be able to generate as high as 600 watts of pure sine wave output at the relevant voltage.

The output across the right hand side opamp of the sine generator is to be connected across the input of the second circuit for initializing the proposed operations.








Battery Wiring Details for the above Simple Sine Wave Inverter Circuit





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157 comments

comments
April 28, 2013 at 6:39 PM delete

Hello Swagatam. Does the output voltage remain stable when several appliances are connected.

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April 28, 2013 at 10:02 PM delete

Hello Hassan,
No it won't be stable, The output will drop with increasing load....

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April 29, 2013 at 2:24 AM delete

How can we improve it for a stable output voltage

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April 29, 2013 at 7:22 AM delete

hi sir swagatam can I asked you how to compute the voltage drop of resistor how to compute the base resistor emitter and colector resistor imean I asking the formula because im not a engineering Im only Technology of 2 years I want to explore my knolegde of electronics hoping sir swagatam i believe your the great Engineer thanks advance.

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Anonymous
April 29, 2013 at 11:17 AM delete

Hi Swagatam

Can ur earlier given output correction circuit be used here, will it work?

Regards

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Anonymous
April 30, 2013 at 8:55 AM delete

hello sir Swagatam this inverter circuit works for all sophisticated devices? ... as pc, lcd tv, laptop, notebooke, etc. thank you very much
luis from Argentina

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April 30, 2013 at 1:27 PM delete

Hi Roderel,

It's can be a huge subject, cannot be explained through comments, you may refer to these article, might provide some help:

http://homemadecircuitsandschematics.blogspot.in/2012/01/how-to-understand-and-use-transistors.html

http://homemadecircuitsandschematics.blogspot.in/2012/01/how-to-make-relay-driver-stage-in.html

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April 30, 2013 at 2:02 PM delete

Hello Luis,

Yes since it's a pure sine wave it's suitable for everything....

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May 1, 2013 at 8:13 PM delete

thanx sirji i think its very usefull to all coz
here all ur fans looking for such ckt
sirji i want knoe that which x'mer used here to obtain max wattage
is this xmer is 24-0-24 20amp transformer

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May 1, 2013 at 9:55 PM delete

Thanks Girish,

the transformer here is 0-24V, but you can also use a 24-0-24V to make it a 48V transformer, but the batteries will have to be 48V x 2nos...this will make the inverter 1KVA rated.

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Anonymous
May 2, 2013 at 6:18 AM delete

If someone builds this circuit please commented operation. Thank you.
Luis.

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Anonymous
May 4, 2013 at 7:55 PM delete

Hi Swagatam

There are two questions I would like to ask:

1. Efficiency of this inverter
2. If I use salvaged power transformer (heavy iron core type, 50hz) from an APC UPS 650, how it can be used in 12V+0+12V circuits since its windings are 8 to 9 volts each instead of 12V. How am I supposed to use such transformers in schematics mentioned at your site, would u like to suggest any change in schematic etc.?

Regards

Sam

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tessy
May 4, 2013 at 8:59 PM delete

i just want to try it.. i will feed you back..thanks for your care

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Anonymous
May 6, 2013 at 2:48 PM delete

very good sir
and no charger / automatic changeover section?

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May 6, 2013 at 5:44 PM delete

Hi Sam,

I am not sure about the efficiency because I haven't tried it yet.

8 to 9 volts in each half winding is in fact perfect for most of my designs as it would provide a little higher than the rated 220V, so even at lower input voltages the output would stick around 220V.

Regards.

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Anonymous
May 8, 2013 at 11:32 AM delete

Hi Swagatam

Thanks for your quick response. However I have two more question:

1. if salvaged transformer winding is 8-9 volt then 12-14 volt from a juicy battery is going to damage the winding by overheating it since it was wound for a lower voltage.

2. Moreover if salvaged transformer is from a sine wave UPS then a modified square wave or square wave inverter may slowly damage it due to extra transients since it was made for a sine wave and not for square wave. I think square wave transformers are made with extra winding (head room for transients) but am not sure what do you say?

Regards

Sam

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May 8, 2013 at 1:06 PM delete

thanks, will try to to update them also...

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May 8, 2013 at 1:13 PM delete

Hi Sam,
A transformer is a solid state device which is made up of metals.

It would get damaged only under conditions where it gets very hot, otherwise I don't think you can damage an iron-cored transformer through any other means.

9V is just under 12V so it would make the transformer slightly warm, not much, moreover it's the wattage consumption at the output that may be responsible for heating up the transformer, if it's controlled appropriately, things would be all right.

You may incorporate my circuits which have a 555 pwm controller attached, this would give you an option of controlling the RMS so that the transformer is not operated under incorrect voltage parameters.

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May 10, 2013 at 9:55 PM delete

hi swagatam

i have gone through the circuit. i just want to know whether this circuit will be able to charge a normal battery of 1kva. please tell me what are the changes required to be done in the circuit so that i can charge that battery using a solar panel

regards,

suneetha

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May 11, 2013 at 10:07 AM delete

Hi Suneetha,

It is not a battery charger circuit, it's an inverter circuit, if you want to include a charger circuit, you can attach the following circuit with it:

http://homemadecircuitsandschematics.blogspot.in/2012/11/high-current-transistor-tip36-datasheet.html

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Anonymous
May 28, 2013 at 5:12 AM delete

Hi Sir,

Your skills building inverters are amazing.
I've seen inverters that do not rely on the transformer to make the output, instead, they first transform low DCV to high DCV (H-bridge)using FETS and small HF transformers, and then modulate for pure sine AC through another H-Bridge i think.

Is it possible that you can give us such a design, cause it seems one can get outputs over 2000W using small transformers.

Hope you take my proposal under consideration

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Anonymous
May 28, 2013 at 7:54 AM delete

Dear Sir, Could you post better resolution picture for second circuit, i can't read resistor's values
Grateful

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May 28, 2013 at 1:28 PM delete

Thanks!

Such inverters are not difficult to design except the output ferrite transformer which requires specific calculations therefore becomes a fairly complex parameter to handle.

Due to this reason I haven't posted any of these circuits.

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May 28, 2013 at 1:31 PM delete

Use the "zoom" feature at the bottom right of the page...you would be able to figure out all the details.

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Anonymous
May 28, 2013 at 10:56 PM delete

Dear sir,

Sorry to bother you again with this, i've tried to zoom in but still can't figure out some numbers, specifically:
R9-R10 - i see 1K(something) i assume 1K0 meaning 1K Ohm
R19-R20-R21-R25- i see (somthing)E22 i assume 0E22 meaning 0,22 Ohm
R24 i assume 10E meaning 10 Ohms
Q7-Q8 i assume BD140
also a assume international notation meaning for example 2k2 = 2,2K Ohm

Again, sorry to bother you with small details, but i really wanna build this circuit and that means spending money on parts, and dont want to make mistakes.

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May 29, 2013 at 1:43 PM delete

yes everything noted by you is correct to the point.

however please note that the design has not been verified practically.

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Anonymous
June 10, 2013 at 8:00 PM delete

hello sir im jay i just want to ask about your sine generator first circuit, its about a tree 2uf parts sir is this a tantalums type or electroytec, i need your answer sir please. ive been build your sine wave inverter i just cant finish it the generator sine wave. Hope to your reply,

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June 11, 2013 at 9:38 AM delete

helo jay,

it could be a tantalum or electrolytic, doesn't matter, but tantalum would be more accurate.

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Anonymous
June 11, 2013 at 7:02 PM delete

thanks sir for an info ive used a electroytic capacitor when i test. its working normarly, but better to use a tantalum type! Now i perfectly use ur sine wave inverter circuit. And i plan for inprove it to 4000wts sir thanks you so much as i read your all article about sine wave generator step by step, and its great all have worked perfectly. Thanks onece again sir..

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July 22, 2013 at 8:54 PM delete

Hi Mr. Swagatam,

I find this design very similar to what I am looking to build for my project.

First, I need to step up 12V DC input to 240V DC output through a Flyback converter. Then, I need to invert that output to an AC form. Can I use this circuit?

Thanks

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July 23, 2013 at 10:35 AM delete

Hi Mr.Weizhuan,

This circuit is not what you are looking for. The above circuit makes use of iron-core bulky transformer, so it won't suit your application.

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July 23, 2013 at 8:53 PM delete

I see. I clearly got it wrong here.

What would you recommend for that application wish I seek to build? I've tried a H-bridge inverter configuration. On circuit (I'm using Proteus) it works but when I implement on hardware, it doesnt.

Can I send you an email with the simulation attached and perhap you could help me with it?

Thanks

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July 24, 2013 at 10:11 AM delete

Simulators can be compared with a "blind man with a stick" so I never use them.

for the converter stage you can try this circuit:

http://homemadecircuitsandschematics.blogspot.in/2013/06/universal-ic-555-buck-boost-circuit.html

For processing the above output you can try the following circuit using mosfets rated at 300V:

http://homemadecircuitsandschematics.blogspot.in/2013/05/full-bridge-1-kva-inverter-circuit.html



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August 3, 2013 at 11:55 AM delete

HI DEAR swagatam i am big fan of your's can you plese provide us circuit digram of 12v DC -230v AC power inverter digram having maximum wattage i am eagerly wating of your reply.

thanking you in adavnce

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August 3, 2013 at 11:55 AM delete

HI DEAR swagatam i am big fan of your's can you plese provide us circuit digram of 12v DC -230v AC power inverter digram having maximum wattage i am eagerly wating of your reply.

thanking you in adavnce

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August 3, 2013 at 12:02 PM delete

Hi dear sir for testing purpose instead of battey can i use power supply for giving a supply to circuit.
Please reply me on Email id taht is;-sfe.shiv@gmail.com


Thanking you

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August 3, 2013 at 6:35 PM delete

Thanks Shiv,

You must first try a smaller version then upgrade it to higher ratings. You may start with the following circuit:

http://homemadecircuitsandschematics.blogspot.in/2012/09/mini-50-watt-mosfet-inverter-circuit.html

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Anonymous
August 7, 2013 at 3:37 PM delete

Sir Swagatam,I'm working on the circuit at the moment,but I have a some confusions which I'l be really happy if you can clear me on. First is the use of "couple of 24v batteries". does it mean I cant build the circuit and use single 12v battery?
secondly, The outputs in the first circuit, are two. Which of them do i connect to the second circuit as input? If its the one on the RHS,where does the second one go?
Finally,how can i determine the Amperage of my transformer?

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August 8, 2013 at 10:26 AM delete

The above circuit works with two batteries, you can use two 12V batteries but the relative power output will be 50% reduced than two 24V batteries.

Use the output from the green line, extreme right side.

for knowing the trafo amp apply 220V at its relevant winding, connect an AC ammeter set at max current range on other side of the trafo for a few seconds until you get the required current reading.

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Isaac
August 9, 2013 at 3:29 AM delete

Thank U so Much sir.I'v started work on the circuit. just a little problem. I live and work in Nigeria,and I'm having issues finding the TL092. Are there any equivalents that could find ??? Thanks once again.

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August 9, 2013 at 9:40 AM delete

you can try LM324 in place of TL072

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Isaac
August 9, 2013 at 12:47 PM delete

Thank U so much. God bless U!

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September 15, 2013 at 2:26 PM delete

Dear sir Swagatam,
On your first diagram where does the other red line output connected to?

can i used 12-0-12 centertap transformer?

thank you very much sir for inspiring me of your blog..
thanks
Paul

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September 15, 2013 at 2:27 PM delete

Dear sir Swagatam,
On your first diagram where does the other red line output connected to?

can i used 12-0-12 centertap transformer?

thank you very much sir for inspiring me of your blog..
thanks
Paul

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September 15, 2013 at 5:52 PM delete

dear sir, can you post all parts need please sir.. thanks a lot..

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September 16, 2013 at 7:47 PM delete

Dear Paul,

Ignore the red line, it's unused...

12-0-12 will work but the center should be left open and a 24V batt should be used.

If I get time i'll surely update the article with the parts list.

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September 19, 2013 at 2:59 PM delete

Dear Sir,

Is 12-0-12 1.3amp center tap transformer can be use here?

thanks...

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September 20, 2013 at 5:14 PM delete

Dear Paul,

You will not get any power from a 1.3amp trafo...use at least a 5 amp rated trafo.

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Anonymous
September 25, 2013 at 7:34 PM delete

Dear mr.swagatam,
i want to ask you about the transformer,i understand that the rating should be minimum 5 ampere.
but what i cant understand is what is the step up value of the transformer
is it 12 volt to 220 volt transformer?
what is the value of the first winding " voltage "
thanks in advance
regards,
MICHAEL

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Anonymous
September 25, 2013 at 10:52 PM delete

dear mr swagatan,
what do you mean by 0-24 volt transformer?
what is the first winding voltage if the second is 220 volt ac
in a clear way,
what should i tell the store when i want to buy it?

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Anonymous
September 26, 2013 at 12:52 AM delete

dear mr swagatam,
where should we input the + and - 12 volts in the first schematic?i mean at which terminals the + and which terminal the - ? and what should we input 12 volt dc or ac?

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September 26, 2013 at 8:20 PM delete

Dear Michael,

The primary should be equal to the battery voltage, in the above figure it is 24V primary, and 220VV secondary(output)

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September 26, 2013 at 8:29 PM delete

tell the shopkeeper that you want a 0-24V/5amp, 220V transformer, this will be sufficient for him to understand.

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September 26, 2013 at 8:56 PM delete

use opamps from the IC 324, and apply the supply across its pin11 (-) and pin4(+)

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Anonymous
September 26, 2013 at 9:28 PM delete

im sorry for bothering you agian mr swagatam,
u didnt get what i mean,
lets say i already got a 12 volts source.
where in the first picture should i input them? before the 1 k resistance?
and what should the 12 volts be ac or dc?

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Anonymous
September 26, 2013 at 9:40 PM delete

Dear mr swagatam,
thank you for your innovations i really like them all,
concerning the first schematic of the sinewave generator
should i feed it with 12 volt ac or 12 volt dc?
regards,

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September 27, 2013 at 12:51 PM delete

As mentioned in my previous comment, the supply needs to be applied to the supply pins of the IC, the lines which are marked with ground symbols will go to the series point of the two batteries, because in the above design we have used two batteries in series for getting the required dual supply voltage.

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September 27, 2013 at 2:23 PM delete

Thanks,

(+)12 to pin4, (-)12V to pin11 of the IC324.

All the ground sysmbols are connected with the series wire of the two batteries.

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September 29, 2013 at 1:42 PM delete

Dear sir,

i have a 220vac primary transformer and secondary output is 18-0-18 vac at 40amps, can i use this on your pure sine wave generator?
thanks...

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Anonymous
October 2, 2013 at 10:41 PM delete

Dear mr swagatam, what should the output be in the fisrt schematic(sinewave generator)? if i input 12 volts then what should the output at the second op amp be?
and why i see alternative simulations? the output is AC or DC?
thanks in advance

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Anonymous
October 2, 2013 at 11:36 PM delete

dear swagatam, i dont know if im getting the right output, all grounds are connected together but not with the series point, is this why i am not getting the output in the schematic of the first circuit? im mesuring between output and ground im getting something like 0.09 volts AC

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October 3, 2013 at 9:53 AM delete

You will need a series battery connection as shown in the diagram for getting the required (+)(-) and ground terminals, without this the circuit won't work.

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October 6, 2013 at 10:13 AM delete

Dear Sir Swagatam,

i have a transformer 18-0-18 and i was wondering how many volts should i feed to it?
and can i use sla battery series/parallel to this circuit i have a bunch of battery laying around..

thank you sir

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October 6, 2013 at 11:16 AM delete

Dear Sir,

in your first circuit where should i put the input voltage? and what is the voltage rating? thanks in advance..

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October 6, 2013 at 9:26 PM delete

Hi Paul,

you can use the 0-18V tap and connect it with the above circuit, and use two 24V batts in series as indicated.

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Anonymous
October 8, 2013 at 1:23 AM delete

Please sir,can i use the output from the sinewave oscillator to drive a darlington pair transistor which will in turn switch current into a transformer, instead of using the second diagram you posted,please reply.thanks.

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October 8, 2013 at 10:25 AM delete

if that would be possible, why would i suggest the second circuit? It's not possible.

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October 11, 2013 at 1:35 PM delete

Please sir, can i have a list of parts needed in your 2nd circuit please.. thank you very much sir..

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October 11, 2013 at 3:00 PM delete

Dear Sir,

on the sine wave generator circuit only output 1 and 2 is used while the output 3 & 4 not in use? i am using LM324 and 60hz is still gonna work sir? thanks in advance..

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October 11, 2013 at 10:27 PM delete

hai sir
i can using ic 8038 it is working or not since wave genator circuit

regards

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October 12, 2013 at 11:40 AM delete

Dear Paul,
LM324 has 4 opamps, you can use any two of them and wire them as per the given first diagram above....

Please click the second diagram and magnify it, you will be able to see all the parts in the diagram.

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October 12, 2013 at 3:56 PM delete

Yes it will work, but the chip is obsolete now.

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October 13, 2013 at 12:23 PM delete

Dear Sir,

in your sine wave generator circuit is 59hz frequency still ok to used for this circuit sir?

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October 13, 2013 at 4:57 PM delete

it will depend on your country specs...if it's 60Hz, then 59Hz will be OK

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October 13, 2013 at 5:37 PM delete

thank you very much sir for the reply.. is 2uf caps on sine wave generator ceramic caps or electrolytic caps? and can i used irf840 sir on Q4 & Q5? thank you in advance sir..

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Anonymous
October 14, 2013 at 1:30 AM delete

Please sir i have 2 questions,

(1) What is the approximate voltage from ur sine wave oscillator.
(2) And can ic Rc4558 dual operational amplifier be used in place of the lm324?.thanks sir,please reply.
Jerry from Nigeria.

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October 14, 2013 at 8:09 AM delete

it's nonpolar, can be any low leakage type. IRF840 is 600v rated won't be a good match with 24v supplies. use irf540 instead.

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October 14, 2013 at 9:37 AM delete

it will almost equal to 24V.

if RC4558 is rated to handle 24V comfortably then you can use it.

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Anonymous
October 14, 2013 at 10:12 AM delete

Please sir,can you explain in details why it wont be possible to use the output from the sinewave oscillator to drive a pair of mosfet or bipolar transistors which will in turn switch current into a transformer, instead of using the second diagram you posted,please reply.thanks.

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Anonymous
October 14, 2013 at 10:24 AM delete

Sir,can 2uf electrolytic caps be used without problem?,because am having issues finding the nonpolar type.

And if polarized caps are ok,how should the caps polarity be connected in the sinewave oscillator?. thanks

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October 14, 2013 at 8:27 PM delete

A simple BJT or mosfet stage won't understand a sine wave, it'll start conducting fully the moment sine voltage exceeds 0.6V or 3V for mosfet.

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October 14, 2013 at 8:54 PM delete

you can try polarized types also, the negative lead should go towards ground symbol

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October 15, 2013 at 2:53 PM delete

Dear sir what is the voltage ratings of all the caps in your circuit sir? thank you very much sir.. and can polyester caps be good sir? becoz i can't find 2uf nonpolar caps in electronic shops here.. thanks again sir..

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October 15, 2013 at 7:44 PM delete

Hi Paul,

all caps are rated at 50V, yes polyester will do.

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October 17, 2013 at 2:54 PM delete

Dear Sir,

in your 2nd diagram sir.. is it ceramic caps? thank you very much...

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October 18, 2013 at 11:56 AM delete

Dear Paul,

yes ceramic caps will work

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October 20, 2013 at 12:43 PM delete

Dear Sir,
sir can i use 12v 20ah battery becoz i have issues finding 24v battery here in my country.. and is there some modification in the circuit to be able to use 12v battery.. thank you very much sir..

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October 21, 2013 at 9:34 AM delete

Dear Paul,

12V will do, but still you would require two of them...and also the output would become half of what could be achieved using 24+24V batteries.

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Anonymous
November 7, 2013 at 11:30 PM delete

Dear Sir, is it possible to shift the phase so the the output from the first IC TL072 and the second are at 120 degree? Iam thinking of adding a third OP AMP to get three outputs at 120 degrees shift. This will allow me to connect the three sine wave outputs to a power stage and transformer in order to get high power three phase.

Can it work by varying the capacitors? I can also see that the gains are different at each output so we need to make them equal before feeding them to power stage. Could you please help with such design sir?

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November 8, 2013 at 10:45 AM delete

You will need three separate driver circuits for it, you may refer to the following article:

http://homemadecircuitsandschematics.blogspot.in/2013/10/three-phase-inverter-circuit.html

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November 17, 2013 at 2:22 PM delete

Dear Sir,

is there any substitute for the transistor BD140,BD139&BC556 i can't seem to find it here in eletronics shop here in the phillippines

thank you very much sir..

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November 18, 2013 at 11:34 AM delete

Dear Paul,

the mentioned components types are the most commonly available and standard, there no easier replacements for these

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edward
December 19, 2013 at 4:15 AM delete

Hi sir i saw this circuit named Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine can this circuit be use for all day? my second question is can i replace 2uf with 2n2 400v ( 2.2nf,) or can use 2.2/50v electrolytic cos 2uf cannot be found here i therefore cherish the hope that my question will meet your kind consideration and approval thank you.

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December 21, 2013 at 11:10 AM delete

Hi Edward, yes the circuit can be used for all day long if appropriate heasinking are provided to the devices.

2.2nF will not do, 2.2uF could work, but it's better to use a 2uF cap[, you can use two 1uF in parallel for making a 2uF cap.

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January 2, 2014 at 3:57 AM delete

to get 2uf or 1uf non poly,another question the second circuit 82pf also is very ok but sir please i want you to help me in this circuit im not too much good in calculation so please don't turn your back on me,in the first circuit can replace 104,103,102,the green one? or 2.2uf/25v electrolytic cos sir in my country it difficultproblem can you tell me any value,3nd question all the two circuit there is no pot i mean variable resister im just asking sir thank you im looking forward to hear from you son. Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine

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January 2, 2014 at 8:37 PM delete

zinnaboy, you will have to make the circuit exactly as its presented, 2uF should be 2uF only, any other value will not do, use two 1uF caps in parallel. This project is a difficult project and is recommended for experts so please be cautioned.

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January 3, 2014 at 4:12 AM delete

ok sir i understand but one thing is can 473nf or 104 the green cap be replace 82pf?

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January 3, 2014 at 12:38 PM delete

you cannot use other values in place of the recommended values, so please use only what's recommended in the diagram.

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January 6, 2014 at 8:12 PM delete

hai sir.i want to ask two questions
1)For this circute ,what happens if i connect 12v 50ah singal battery?
2)can i change step up transformer 12-012 10amps instad of 0-024v.if the center tap is connected to 12v 50 ah battery possitive?

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January 7, 2014 at 1:03 PM delete

Hi Prasad,

Single battery will not work because the above design uses a single winding push-pull configuration.
12-0-12v will work, keep the center taps shorted and unused and use 2nos 24v batts.

The above design is not a center tap type inverter so center tap cannot be used here.

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February 17, 2014 at 8:45 PM delete

sir please sorry for disturbing you ok,sir please can i replace 105/400vpp in place of 2uf,can 18pf be replace 82pf?. sir i want to ask you that where is the red line of the first circuit connect to cos it seem out put of the circuit is 2 out put? sir that is all my problem thank you.

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February 18, 2014 at 9:07 AM delete

NO, you will have to do everything as given in the circuit.

red line goes nowhere. the green output is to be used for feeding the inverter.

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February 19, 2014 at 1:31 AM delete

ok sir why im asking you is my country don't sell tantalum capacitor, sir plse what bout electrolytic capacitor 1uf/25v can i add 2 in parallel to get 2uf electrolytic it is going to work?thank you,

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February 19, 2014 at 9:00 PM delete

biannz, don't try this circuit it's strictly not recommended for the newcomers, there are other simpler versions you can try them instead

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February 20, 2014 at 5:32 AM delete

ok sir but i have build some of your inverters circuit some of it work very well but it not a pure sine wave so if you said i should not go for this i agree but i need a pure sine wave inverter circuit so please refer me to which is not difficult i mean a pure sine wave ok sir even this circuit is not difficult build but some of the pats is not available here in my country that is why i to confirm from you if i can use this blab-la i guess your understand what i mean,thank you.

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February 20, 2014 at 11:49 AM delete

biannz, pure sine wave circuits are difficult and only recommended for expert hobbyists, if you are confident you can go ahead wit the above circuit.

all pats should be exactly as given in the schematic, you cannot replace them with other values, it will produce wrong results.

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February 20, 2014 at 9:39 PM delete

thank you sir,please there is resistor connected to emitter of BD140 it 1k resistor? sir im still confident to build it i have all the pats except 82pf that is the only one i don't fine anywhere.

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February 21, 2014 at 12:44 PM delete

biannz, you can use 100pf or any other close value

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February 22, 2014 at 2:51 AM delete

ok sir thank you,my question is in the first circuit TL072 should i connects the positive of the batt to pin 8 of tlo72 and same to negative or it don't need any power from the batt it should build the way it presented?thank you.

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February 22, 2014 at 1:17 PM delete

sir can i use only 12v battery with this circuit

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February 22, 2014 at 1:42 PM delete

biannz, please check the datasheet of the IC and find out the Vdd(+) and Vss(-) pins of the IC.

It will definitely need power from the battery otherwise it will never work.

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February 22, 2014 at 1:45 PM delete

...pin8 is positive and pin4 is negative.....but apply 12V only.

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February 23, 2014 at 9:06 AM delete

yes, you can use two 12v batteries and connect them as shown

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March 27, 2014 at 7:06 AM delete

sir thank you sir please my question is in the firs circuit you did not show the positive sign of the capacitor i can see the 1k and the 2uf show negative so what about the tw0 cap 2uf on top of the circuit it the green lines a positive?
another question can use the firs circuit to feed my four IRF540N in series with 56 ohm resistor to the G will it be work? third question can you please upload the full circuit of the diagram? thank you for spending your time on us we very greateful .

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March 27, 2014 at 5:39 PM delete

biannz, use non-polar capacitors for those. you can put two 1uF non-polar caps in parallel if you are unable to get 2uF.

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March 27, 2014 at 5:40 PM delete

i did not understand your second question.
I have already shown the full diagram in the 1kva inverter article.

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March 28, 2014 at 3:33 AM delete

ok sir but sir the two IRF540n got hot why sir? can i use only N- channel in the circuit or the 0.22 ohm resistor should change cos i suggest it becos of combination of the fets that why it got hot or my suggest is wrong? second what volt should the output of the TL072 be

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March 29, 2014 at 10:27 AM delete

biannz, the mosfets should not become hot if the cirucit is built correctly.

take the help of an expert electronic engineer who can schematics well.

how can a n-channel work for p-channel?? think before you ask.

0.22 are in fact for safeguarding the devices, so they are definitely not causing the heating issues, it's surely due to some hidden fault in your design.

dont worry about the TL072 output, first make sure the inveter devices remain cool on switch.

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April 1, 2014 at 6:29 AM delete

OK sir but it IRF9540N a p-channel? if it is p-channel then it should go to the positive connection right,or no? thank you

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April 1, 2014 at 10:49 AM delete

bianzz, everything's correctly configured in the shown inverter circuit according to the layout. follow it as it's shown...

Any modification would result in fire and smoke.

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April 11, 2014 at 7:09 PM delete

pls sir, am doing a project on modified sine wave 3kva inverter and am using a microcontroller to produce the waveform....pls can you help me with a circuit diagram and the specification of the components to be used

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April 13, 2014 at 10:38 AM delete

Auwal, I won't do the programming, I can try the remaining

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April 14, 2014 at 2:07 PM delete

thank you sir. i will be waiting for your feedback

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April 15, 2014 at 8:46 AM delete

please specify the things that you would need in the circuit

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April 17, 2014 at 4:41 AM delete

i will want it to have a voltage regulator, overload circuit, battery level indicator. if there is anything you could help me with that will make the inverter a little bit unique i will be happy. thank you sir

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April 17, 2014 at 8:08 PM delete

please make the above basic design first, once you complete it successfully, i'll guide you through the subsequent stages as asked by you.

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April 26, 2014 at 12:08 AM delete

here is a diagram i got after a little research and i will like to replace the SG3524 with PIC16F628A or PIC16F628 and was wondering how to removing transformer 1 from the diagram. https://drive.google.com/file/d/0B6eo6OIGHPLkYlNiaXJGenBPOTg/edit?usp=sharing Thank you, will be waiting for your feed back

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April 26, 2014 at 11:41 AM delete

for removing T1 you may incorporate the following circuit:

http://homemadecircuitsandschematics.blogspot.in/2014/01/automatic-output-voltage-regulator.html

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April 26, 2014 at 2:51 PM delete

what of when replacing the SG3524 with the PIC16F628, will there be any modifications??

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April 27, 2014 at 9:11 AM delete

there will be modifications, but I cannot specify them

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April 27, 2014 at 3:32 PM delete

ok! this diagram is for a 500W inverter, do u think by adding Q7 and Q8 transistors in parallel it can increase the power output. thank you

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June 22, 2014 at 4:54 AM delete

sir
please can i use any N-CHANNEL AND P-CHANNEL fets in this circuit? the second circuit it the capacitor 4700uf or 470uf? 68pf can be replace 82pf?thank you.

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June 22, 2014 at 10:23 PM delete

Daniel, the rating of the mosfets should be higher than the battery specs used for the inverter

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June 23, 2014 at 12:08 AM delete

sir
please you did not answer my question as was expecting from you i ask three questions explain all for me so that the circuit will be so simple to build sir thank you.

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November 16, 2014 at 10:53 PM delete

Hello Sir, Which simulator software are you using. I am using proteus but I could not get sinewave.

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November 17, 2014 at 10:26 AM delete

Hello Mohamed, confirm the upper circuit's waveform first.....it will surely show the production of the sine waves, if correctly configured

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July 11, 2015 at 8:52 PM delete

love to make dis circuit.bt sir, i have two questio
1)what is theuse of the second output of d generator.i mean d opamp on the left side.
2)can i just make the generator and use it wit another power stage of another inverter tell me how. because i have an inverter of 300watt but is squarewave cos it uses ne555.thank you.mayokun from nigeria

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July 12, 2015 at 11:47 AM delete

the green output is the sine wave output, the red one is square wave.

No, you cannot use the sine output with any inverter's power stage...that will not yield sinewave output...that's why only the above circuit has been recommended

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July 12, 2015 at 7:19 PM delete

another question is,am i to power the wave generator with a seperate 12volts battery or should i jjust tap from the 24volts and regulate with ic7812?

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July 13, 2015 at 9:50 AM delete

no need of a separate power supply, you can extract the voltage from the inverter battery using a 7812 IC

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September 14, 2015 at 10:48 PM delete

WHat should be the capacity of the battery?????????does gud capacity give gud output power??

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September 14, 2015 at 10:52 PM delete

and also i need to attach the (battery indicator circuit) and the (battery charging circuit with auto cut off feature) and (Low power shut down) so that the battery's charge could be determined and battery could be charged when needed and also the battery is not overcharged.....This would present a perfect inverter with all these.....

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September 14, 2015 at 10:54 PM delete

plzz reply faST I AM WAITING FOR YOUR REPLY

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September 14, 2015 at 10:57 PM delete

AND ALSO SWAGATAM SIR R U SURE THAT THIS CIRCUIT WORKS?????? BECAUSE AFTER SPENDING IF IT DOESNT WORK I WOULD NOT BE ABLE TO RESIST... AND ALSO THE BATTERIES COST A LOT..pLZZ TELL WHETHER THE CIRCUIT IS 100% WORKING OR NOT?????

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September 15, 2015 at 2:00 PM delete

Harishvar, I am sure this circuit will work, if I were to make it, but I cannot guarantee this for others, because it might require a thorough knowledge of all the aspects involved with the design to achieve success..

Moreover this kind of circuits are not for the newcomers, if you get stuck somewhere you would be clueless regarding the solution.

for an automatic battery circuit you can prefer the second design from the following post:

http://www.homemade-circuits.com/2011/12/how-to-make-simple-low-battery-voltage.html

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September 15, 2015 at 11:24 PM delete

sir it means that i cant make this inverter right????? :-(...feeling sad

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September 16, 2015 at 2:06 PM delete

harishvar, You can begin with a simpler design as shown below, and if you succeed then proceed step wise to upgrade it further...

http://www.homemade-circuits.com/2012/09/mini-50-watt-mosfet-inverter-circuit.html

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September 16, 2015 at 9:53 PM delete

sir why cant i make this : ( http://www.homemade-circuits.com/2013/10/pure-sine-wave-inverter-circuit-using.html ) ....... because i think 50 watt would be very less and it wont be that useful....i am also trying to attach a 12v car battery.....if i were to attach this battery then sir plzz give me a circuit charging car batteries......because charging car batteries would be extremely dangerous if anything wrong happens then the whole battery may explode which will cause a very huge damage....so plzz give me a safe circuit for charging the car batteries and also for the(cd4047 circuit) can you give an another schematic because i cuoldnt find where the + and the - terminals of the battery are coming from.......i would really be thankful to you if u give me another schematic for the cd4047 inverter circuit.....and also plzz tell that using a car battery would be safe or not......because i am very scared to use it.....

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September 17, 2015 at 8:42 PM delete

harishvar, if you are confident with your knowledge and skills then you can definitely go ahead and try the circuit...
For an automatic battery charger circuit you may build the second circuit from the following article:

http://www.homemade-circuits.com/2011/12/how-to-make-simple-low-battery-voltage.html

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November 8, 2015 at 6:18 PM delete

Well. I think this circuit is similar to Class A/B OCL Amplifier...

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