Inverter Circuit Diagram

One of the most famous circuits of our website

Power inverter is a very useful device which can convert Low voltage from a DC sources to high voltage AC. The most common power inverter is 12V to 240V inverter. Perhaps that is because 12V batteries are common and easily available. This type of power inverter usually draws high current from a DC battery therefore your battery should be able to provide a high flow of electric current. Normally lead acid batteries can serve this purpose easily. The power taken from battery is then converted to 240V square wave alternative current so that we may empower those electric appliances which work on 240V instead of 12V. Inverter falls in the category of expensive devices so many people don’t buy them even if they need them. What if I tell you how to build an inverter yourself?
remember when I build my first inverter, I was very happy and I invited a lot of friends to see my homemade inverter. At that time inverters were rarely available. I am sure you will feel the same if you successfully build this circuit. Before you start building this inverter circuit, I want to mention that this circuit involves 240V and 500W which can be fatal. You should take all security precautions before building this circuit. Preferably use electricity protective gloves and try not to play with the inverter circuit when it is operational. You will need little to medium knowledge of electronics in order to build this circuit. Alright, let us get to work. There are a lot of inverter circuit diagrams available online; some of them are complex and others are low performance. I have researched on a lot of them but in the end, I designed my own inverter circuit which is somewhat comparable to any professionally made inverter but still is simple enough for you to try.
Here is the inverter circuit diagram:

Ups Inverter Circuit DiagramUps Inverter Circuit Diagram
  • 2 Resisters 470 Ohm ¼ Watt
  • 3 Resisters 22 Ohm 1 Watt
  • 1 Variable resister 10K
  • 1 Capacitor 1uf
  • 1 Capacitor 220uf
  • 1 Zener diode 8.2V
  • 1 IC CD4047
  • 1 IC 7809
  • 1 Transformer 12+12/240 (500W)
  • 2 Transistors D313
  • 12 Power Transistors TIP35C (make two pairs of 6 transistors each connected in parallel)
  • 2 Heat sinks to fit power transistors
  • Some wiring wire (for connections)
  • A wiro-board (To build circuit on)
  • A 12V battery of 12V power supply for testing purposes

There is only one variable resistance in this circuit diagram which is used to adjust frequency of 240V AC output current. You should have a frequency meter to adjust this frequency of 50HZ to 60HZ as per your requirement. Please do not power up any device with your inverter before frequency adjustment because a wrong AC frequency can burn your equipment as well as your inverter.
I have used a two-stage regulated power supply to avoid frequency changes with the drop of battery voltage. First stage is 7809 which is a standalone voltage regulator. It converts 12V DC to 9V DC. Then we have used a 22 Ohm resistor and then a zener diode of 8.2V which forces voltage to stay at 8.2V. The 22 Ohm resistor is there just to aid zener diode by current limiting. The output frequency of this inverter circuit is square wave so it is not best to power up inductive loads so use it at your own risk. However, I do power up fans at home using this inverter and I never had any problems other than a little increase in fans noise. If you have any questions, please use the comment box bellow.

Dandy2009-06-09 05:36:08

Thanks for sharing this inverter circuit, can you please tell me which power transistors can I use if TIP35C is not available in my area? Thanks in advanced

genius2009-06-11 16:17:03

You can use any NPN transistor here which has power range of minimum 100W and 10A. other examples could be D1047, C2581, 2N3055. however TIP35C is certainly better.

Farasat Hassnain2009-06-21 19:29:53

In this circuit which transformer will i use please tell her volts and amp.And Capacitor 220uf and Capacitor1uf volt.thanks

Farasat Hassnain2009-06-22 09:04:23

This inverter is automatic or not...please help me to build this inverter...thanks

rahul2009-06-24 11:56:31

how to make the input section a rechargable source that we can power up the equipments even when there is no supply....

great thanksss for the circuit

anthony OGBOLU2009-06-25 03:35:45

i want to know the primary, secondary, and the finally stage of your 3kva inverter circuit dragram for learn.i will be greatfull if you can help me

genius2009-06-25 19:04:21

@Farasat Hassnain, you can use a 240v / 12+12 / with a capacity of 40 Amp minimum. Both capacitors should be 25V or above. You can make this inverter automatic using a double relay. I will post an automatic version of this inverter soon.
@Rahul, yes this inverter can work on 12V Battery. You can use any 12V recharge circuit to recharge the battery. Recharge circuits are always separate from inverter part.
@Anthony, In first stage, The CD4047 acts are an accelerator and outputs signal using 470OHM resistors to the D313 transistors, then in second stage these transistors amplify the frequency signal to drive the main transistors and then transfer the signal on the Bases of main transistors using 22OHM 2W resistors and then in the third and last stage, the Main transistors starts to switch as per the given frequency signal . These high current pulses causes the transformer to generate 240V square wave output. I hope that explains every thing, if you have more questions then let me know. :)

Ahmed2009-07-04 00:40:02

I want to know that how can we make Transformer 12+12/240 (500W)what is size of its central pole, primary and secondary standard wire guage

Ezekiel2009-07-04 20:36:57

Please I need a version that uses 2 relays to make the Inverter automatics, how soon can I have it please.

Anand2009-07-05 07:12:21

If use one 40W light and one fan, how long the battery will last?

genius2009-07-05 16:36:23

@Anand, this depends upon which battery you are using. Suppose if you are using a 12V 115AH battery then it will last from 5 to 7 hours depending upon the quality of battery. the calculation is assuming that you are using a 40W tube light and a 120 Watt Ceiling Fan.

Ajur2009-07-08 18:54:01

Thanks for giving a wonder full information. but i need some more information regarding the transformer as ya have used 12+12/240 transformer. so plz do reply to this.

Dave Hotrum2009-07-10 09:27:31

I am building an electric car. I have a 10 hp 3ph motor. The inverter is out of my price range. What do I need to do to change this diagram to work on my car? Thanks for everyones help.

charles chuks ofili2009-07-10 13:34:30

i think i found this site very intresting, i got what i was looking for though it not exactly what i wanted but this gave me a clue thanks

sandeep2009-07-13 15:04:24

my inverter is of microtech company.iwrongly connected the wires from inverter to the it is not working .please tell what should i do & if there any big fault

genius2009-07-14 14:17:32

@Sandeep, It is impossible to say any thing about your inverter unless i see it. You better contact the person from which you purchased it.

genius2009-07-14 14:31:58

@Dave Hotrum, It is not a good idea to use an inverter in such high current applications. You will lose a lot of current during the voltage conversion by the inverter itself. It is impossible to build a 100 percent efficient inverter. almost 25% of the energy will be lost even if you get the most efficient and expensive inverter. I would suggest that you should find 12V or 24V 10HP motor for this purpose. I am sure you will find one if you search for it. I have used one in a machine I made earlier. A 12v or 24v motor will give you more power and running time due the the fact that it will fully utilize the available current directly from the batteries. Let me know if you still have questions. Thank:)

genius2009-07-14 14:36:08

@Ajur, You can use a regular 240 to 12+12 transformer. No need to find a special one. Just keep in your mind the watts you are going to need. For example, if you are building a 500W inverter, you should arrange a transformer capable of dealing with 500W (42A X 12V = 504VA(W)) your transformer should be capable of giving 42A on 12V and 21A on 24V.

Asim2009-07-20 16:32:03

can i use IRf150 in place of Transistors TIP35C.what is your opinion?
please describe your opinion as soon as posible

muthu2009-07-22 13:16:55

in this 500 watts inverter how much amps in battery please tell me

genius2009-07-22 16:58:44

@muthu. For 500 Watts inverter, it is recommended to use minimum 85 AMP battery. 140AMP or 200AMP will give you more backup time and more balanced power.

genius2009-07-22 17:29:31

@Asim. You can use D1047, C2581, 2N3055 or any other NPN transistor with power rating of 10A 100W or above with 45V or above value.

muthu2009-07-22 17:50:37

CAN I GET VARIABLE RESISTER 10K,CAPACITOR1uf&220uf what is value of volts

kayode2009-07-24 16:54:19

pls sir could u make ur circuit more detailed

Asim2009-07-25 21:04:52

Hi genious!I have one more problem.
In your inverter diagram there is no led lite to indicate whether the UPS is in working position,chargeing position or trip.
Please give your gainful opinion.
Plaese told from where i give connection to led lights

Zaid2009-07-28 12:02:04

hellow gnious!
I want to know that either this circuit can charge the battry or not and is this inverter is automatic or not if not plaese post the automatic inverter daigram soon.
I shall be very thankful for this

ruel2009-07-30 21:10:00

thanks for sharing your idea..
i am planning to build an inverter using your circuit..
i hope you will guide me building one.
thanks a lot..

keskin2009-07-31 11:49:05

hi genius, thank you for circuit. i have few questions:
- could you tell me the direction of the two capacitors? Which side is (+)?
- what is the pin connections of 7809?
- what kind of devices can we run if we use a lower-powered transformer, such as 200 W?
(this is an urgent case. Please help me as soon as possible)

Jonathan2009-08-05 12:58:17

hi genius pls can i no the volt of the capacitor1uf and 220uf

oluwafemi2009-08-08 12:12:01

thank for sharing your idea..
iam planning to build an inverter using your circuit,but can i us a IRF150N transistor in place of TIP35C transisor.
please i need answer to this question as soon as posible.

lokesh2009-08-08 18:22:40

6v to 40w inverter circuit

John2009-08-13 13:54:04

Hi & thanks for sharing your idea with us. I assume that I can use this same plan to build a 3000+ watt inverter but would obviously need to change the values and sizes of the components. Can you please advise me accordingly?
Thank you again for your generosity,

samson jimoh2009-08-14 12:49:24

hello sir, thanks for sharing your idea on

your inverter very intresting.can i get another circuit that can up to 3kv i will be very happy if i can get it
my name is samson jimoh my email is

Tunde2009-08-19 16:02:23

I like ur concept, but i want to know if i can wind the transformer my self and if i can, how

Darlington2009-08-19 18:03:22

Hi guys, thank you so much for the inverter circuit diagram for 500w. It works so well. Now i have a question, however, because this one produces square wave, can i get one that gives sine wave?. If there is please sent me even via email. Thanks.

Casper2009-08-23 00:03:44

Still having a problem understanding the 7809 polarity in this curcuit. I have now placed the 7809 "outside" the curcuit to overcome this problem. The zener clamp shunt the 9V output down to 8.2 volt and supply the CD4047. Is my approch ok doing this? Any ideas?

Ratnadeep2009-08-25 23:06:11

If i want to use this inverter with acid cell what should be the "VA" of that battery?

genius2009-08-26 19:07:51

@Ratnadeep any thing over 100VA will be good. Please select one Depending upon the your load and the backup time.the more the better.
@Casper, 7809 is actually placed there to decrease the differential load on the 8.2V zener diod. You can even skip the 7809 entirely and can place an extra 22OHM 1 watt resister in place of 7809, the 8.2V zener will automatcially reduce the voltage to 8.2 but it is not recommended though.
@Darlington, i will try my best to post a self tested sine wave circuit as well as soon as possible.
@Tunde, alright i will try to post a tutorial on how to wind a transformer for this inverter circuit as well.
@samson, you can use same circuit for 3KV you only need to rewind the transformer for appropriate voltage. For the power transistors number, just divide your power requirement by 100 and then use that number of TIP35c Transistors on both sides. For example, if your power output is 2000W, just divide it by 100 which is equal to (2000/100) =20 so 20 TIP35C on each side.

dams2009-08-28 17:09:35

i need more circuit diagrams in my mail 4 better construction. i really love the provided circuit diagram.

Ray Kompe2009-09-02 03:24:34

Hi Genius, thanks for your article. You have helped me nut out how an inverter works. Can you tell me the practical advantages of a sinewave inverter as opposed to a "dirty" modified square wave on?. Will the latter cause over-heating of capacitors in appliances that they are connected to? Will they cause any damage and if they do, in what way?

hakeem2009-09-03 15:51:02

Thanks a million
Will get back to you after building it

johnkennedy2009-09-04 06:15:43

1st ,how can i use FET in place of power transistors?
2nd; how can an inverter work when the battery is diconected after the first suppy.pls help me out.

Austyno2009-09-04 09:53:05

please i am a student and i ant to construct an inverter in my summer project,i luv your diagram but i am confused on how to connect the TIP transistors can you draw the connections for me through my email; i will be pleased.

Austyno2009-09-04 10:05:26

please how can i wind the transformer to b used and how can the battery be charged .please can you post it to my mail;

janmuhammad2009-09-17 10:11:45

please how can i wind the tarnsformer to be used can the battery charged.can you post it my mail thanks

Rudresh2009-09-17 14:35:28

Thanx for the ckt.
Could you tell the polaritys of 2 capacitors?
CD 4047 is not having connected - ve terminal in the ckt.
Could you please clarify.

miki2009-09-19 04:28:36

how do u get make a 24volt inverter from a 12volt..what is really important i should look into

Anicet Laurent2009-09-20 15:47:02

I have used power fets 2SK2233 as power transistors. 4 Fets managed to drive the load of 600W. My problem is on how can I change the waves to Sinewve?
Anicet H. Laurent,P.O.Box 5111 Mwanza,Tanzania.

John2009-09-28 00:15:53

I have seen what you did,it`s very good,but can you help me with the desing and construction of a unit inverter amplifier in a follow up state.thanks

adeola2009-09-29 13:20:27

please,i need all the neccessary information on inverter circult diagram.

Ratnadeep2009-10-01 10:48:23

hi, i am willing to do ur ckt. but i can not understand that where is the ground portion of ic CD4047. Another problem is that the "0" volt terminal of transformer connected to the positive end of Battery? is it true plz tell me.

kelvin chibale2009-10-09 16:47:35

Is it possible to find a system where the inverter in retain charges the battery?

daniel2009-10-12 03:40:30

plz i need the conection the transistors,and the exertly voltage of the capacitors, can this inverter power a televition and 5x of 100w bulbs?
soon to here from you throug my mail plz.

sara2009-10-13 14:17:29

i want to design a small scale wind power lighting system. Is this circuit is applicable to complete my design. The wind generator connected to 12V battery and than to his circuit. Is it possible?

engel2009-10-14 20:07:40

how to wound transformer for this
the 12v wound first?240v as sec?

JASTICE E. NATHANIEL2009-10-20 17:10:36

I thank for your circuit of inverter so may you send for me circuit diagram of pure sine wave inverter with power of 3000watts or 4000watts.

sara2009-10-20 17:35:08

what are the other components can be used to replace CD4047

kelvin okeyson2009-10-22 20:47:05

i thank you for the inverter circuit,can i use thes inverter to power up to 100W bulbX5 and one television

murugan2009-11-02 11:21:47

give the pin details of ic 7809 and how can charging the battery give the circuit.

Shane2009-11-02 13:47:22

Is there any possiblilty you could tell me what the diffrence is to sine wave and just square wave? also could you send me an automatic version on which i could just plug into say a car socket and run things off?

if you could send it to my email : that would be great or just on here as ill check this regulary.


genius2009-11-05 18:16:42

@Ray Kompe under my experience, modified sine wave and pure sine wave inverters are almost identical. However modified sine wave inverters cause a little ripple in poorly filtered power supplies, secondly, modified sine wave inverters has less power conversion ratio when compared to pure sine wave. Square wave inverters like this one are thought to be a little harmful for conductive load as well as some digital loads but practically, I think digital powers supplies can easily handle square wave. However conductive load like motors can suffer from low starting surge or heat up under heavy load.
@JanMuhammad, @Johnkennedy, kelvin chibale Inverter is not intended to convert to backup automatically, or to charge battery automatically, you are probably looking for a UPS circuit diagram. I will soon upload one, Please keep visiting.
@Austyno if you hold a TIP35C transistor with its 3 pins upwards and with the front side towards you, the most left side pin is Emitter, the center one is collector and the right one is Base.
@Anicet Laurent @, JASTICE E. NATHANIEL You cannot convert this circuit into sine wave that easily. Right now there are various modified sine wave circuits are available but I am trying to built a simple one. Once done, I will post it here. Please keep visiting.
@Ratnadeep Yes, the center loop or “0” volt terminal of the transformer will be connected to the positive end of the battery.
@Daniel, @Kelvin Okeyson yes this inverter can power up the load depending upon the transformer and the power transistors you use. Please read the article again, you will find the info you want.
@Sara Yes this inverter can server your purpose of 12V to 240V conversion using wind power. And for your second question, CD4047 is a common Integrated Circuit (IC) and can be easily found in almost any electronics market in the world. I am afraid it cannot be replaced with any other IC.
@engel, you can use a standard 12V+12V / 240V transformer if you cannot wind it.
@murugun Please read this article to know about 7809 pins
@Shane, I will soon post and article about sine wave, modified sine wave and square wave due to the fact that a lot of people request it. Secondly for you can attach this circuit to your car battery. Just place a high power switch on the 12V positive input. The car automatically charges your battery whenever you start it. However if you don’t often drive then your car battery might get drained due to lack of charging. Try to balance your driving time and your inverter usage. The more you drive, the more battery is charged.

aiioe2009-11-10 14:41:56

Thanks. Good day, i saw your project kudos to you. Sir, can i use this inverter made to power television, DVD,and radio. Also, how can i continue developing this inverter for sales and even trained people with it.How can i make inverter with 24V input to give 240V output, how can i reduce any noise that might result due to the construction, those components used in your own how will i upgrade their value to suit my construction.

seun.12009-11-12 14:57:47

can i use irf44 phet in place of tip35c transistor

seun.12009-11-12 15:03:47

can u forward 2000w inverter circuit to my mail box,use phet

ATTA ITOPA2009-11-12 19:13:56

hi, nice to see your work. i want to make an enquiry about the circuit diagram. how can i know the points of connections at any point.i mean how to differenciate between connected points and the unconected points in the circuit diagram:.pls reply me to this email thanks

Ahmad nawaz2009-11-23 11:20:29

i have used this circuit and found very good result.
but i have a problem in the circuit,that on the inverter the fan speed is not satisfied or the fan speed is low on the inverter.plz sove my two problems about the circuit.
1-if i use the 220nF capacitor then what happen?
2-if i use the irf 150N replacing the npn transistors,so what is new change in the circuit.

Darlington2009-11-24 20:41:44

Hi genius, i greet you. Just to remind you that you promised to send me your own tested sine wave inverter circuit diagram. Please, post it to this email address together with the automatic relay controlled circuit,

genius2009-11-27 21:42:03

@Ahmad Nawaz, my friend, slow fan speeds can be due to two reasons,
1. Inverter Frequency is not 60Hz, you can use the variable to adjust inverter frequency. It is better to get a frequency meter before at this. However you can also put only a fan on your inverter and then adjust the variable till you get the required speed.
2. You can add 10% extra turns on the output side (240V) of your transformer.
I personally think you dont need to attempt the second method, you probably only need to adjust inverter frequency.
Secondly, yes you can use IRF as well but it is a good idea to ground a 10K resister from the bases of IRF150N. However I have tested TIP35C with this circuit not IRFs

allan2010-01-17 12:06:10

what is the formula for computing the transformer wattage base on your ckt?...
from choosing your battery to match the load?
pls give us also the formula on how the 115ah battery can sustain 60w bulb?
more power

Darlington2010-01-17 18:58:59

Hi genius,thanks for your commitment in assisting us
with technical information, but i have an issue, your soon is always taking centuries. You promised to upload a UPS schematic diagram and an automatic relay controled inverter, i have been waiting since August 2009 in vain. Is that you dont have them ready? let us know so that we can patiently wait. Thanks.

Uzair Amir2010-02-09 21:05:55

@ Mr.Jan Mohammad
bhai did u get the circuit which u have asked in this forum?for which u have given ur email id?

Kaleem2010-03-09 07:17:07

Hi sir if we use 24 power transistor 2n3055 each contain 12 transistor in parallal and we connect them 220 ohm 5 watt resistor i think that power will be batter??????? m i ri8

Sam2010-03-27 16:58:29

Thanks, it is a great project specially for countries of Blackouts and Brownouts. In our country we can have locally build inverters but without power correction factor or overload etc. and they are pure square wave & costly. In my view Modified Sign Wave inverters are better and must cheaper and easier as compared to a pure sign wave. We all will benefit from a Modified sign wave inverter design. If possible please do include overload protection. Thanks again

Adeel2010-04-28 23:49:00

dear guys if any body knows the polarity of capicitor then please share because I dont know where is the inventor of this please shares us that how we place the capacitor...

Zain2010-05-20 23:24:45

@john, 7809 is a positive voltage regulator. this means that if we give 12V DC or higher (Max 35V DC as per its data sheet) then this IC regulates the output to be exactly 9V. For further detail you may google the data sheet of this IC.

Chintem Joe2010-05-27 20:05:13

the inverter circuit on this page is deficient. I think we should think of a better way of designing an inverter that can generate a smooth AC signal

Hippie2010-05-29 00:15:14

Genuis, I marvel at you patience, explaining things that can be found on google without any problems, and answering rudimentory questions.

Can those of you that ask all these questions not interpret a datasheet for a Cd4047? Or a 7809 for that matter, or figure out for yourselves what voltage a cap should have? Give the poor man/lady a break!

And no, you cannot use the cct for a UPS, basta!

More power to you all!

Erwin2010-06-01 13:21:24

This kind of inverter is obsolete in our home lab.
First, becuse efficiency is low compared to the Pulse Width Modulation type inverters. Second, because of the bulky iron core transformer.
Try researching IR (International Rectifier)Projects
They have PWM drivers for PWM inverters.

Jack Jenson2010-06-06 19:27:05

Circuit works great and I managed to substitute some components and increase power to about 700 watts.
waiting for you to upgrade this to Pure Sine Wave output, preferably a circuit that can just piggyback at the output end.
Thanks again. jack Jenson, Malaysia.

misiko2010-06-12 18:08:02

thanhs 4 the idea am still studying the circuit to see if I can make one for myself.
can I use thi circuit on a 40ah battery

smnadim2010-06-14 00:48:38

This is a very good square wave inverter. I am however waiting for the automatic version with battery charging and automatic switchover to inverter when power goes off. Kindly provide this as promised.

shakeel2010-07-05 02:21:24

Thankyou so much for the falloing circuit diagram you don,t mention ground battery connection only you show at transister at tp35c with ground symble.but as you know regulator 7809 also need groung connection. capecitor 220 mf & capecitor 01 mf also need ground connection.

ric2010-07-07 23:29:20

wow the best! i try here in my room working well i used tip31 in 4 pcs and my drive is MPSA42 working very well. thanks for this upload

Fily2010-07-14 04:54:56

Hello there, i want to know if you can make this inverter design for 10kw continuos and 110-127 volts out.
I need to make one of this. Tell me if you can do it and how much would i pay you.
Thank you. (Excuse my english, is too bad)

Bing2010-08-03 18:06:07

Hello Genius,
I plan to build your 500 watt inverter as off-grid application, I will combine with the micro hydro power to charge the battery.
As you mentioned earlier that you would try your best to post a self tested sine wave circuit as well as soon as possible, have you finished with that plan?
BTW, your 500 watt inverter is square wave inverter, what will happen if I load it with tv tube, LCD tv, amplifier, and water pump? please advise me, Many thanks.

Muyiwa Obadara2010-08-06 14:51:07

What Is The Voltage Of The 220uf and 1Uf Capacitors

john2010-08-16 18:59:38

i realy appritiate your intrest to technology and i admire you. I built an inverter of 2000watts and test run it with a 12volt 100amp battery to power five 60watts light bulbs, two phone chargers and step down stereo system and it lasted for only two hours plus. what do i do to generate light with inverter for a longer time?

Dinesh2010-09-03 15:49:29

sir i hav build d inverter with ur circuit but wid a smal change tat is i hav used 1313 instead of d313 transistor wen i power on its geting too much heated but i check their no physical short circuit in my invertor.could kindly help me ;-)

Alex2010-09-06 20:44:55

you have used 4047 in this circuit. Is it a CMOS IC?
I have heard that CMOS ICs are sensitive to physical touch. I we touch this CMOS IC while soldering it, is it possible to affect its performance.

Brad2010-09-06 20:46:12

hey very cool project. so just for giggles…if i was off-grid and had need for greater a/c demands a) am i better to have multipul ..say 500w inverters or am i better to build one power house? b) because of the diy prosess i could sevice my own gear and what would be the best parts to have on stock?(burnout fastest)and finally if i build at a nominal power level can i beef up the inverters with simple add-ons or bigger hard ware???? really cool stuff dude

bolaji2010-09-18 18:34:33

hello pls i need a project write up on inverter and a circuit about 300watt

KRISHNASWAMY2010-09-21 17:08:37

the circuit was very simple and eassy to make with in a day for 230 v at high power(500)w
please shoe me the transformer calculation
I made this inverter and gave to my frinds

ayubu2010-09-27 18:28:52

hey very cool project. so just for giggles if iwas off grid and had need for greater ac& dc demands a am batter to have cicuit diagram 5000w inverters or am i better to build one power house? b because of the diy prosess i could sevice my own gear and what would

Vyakii2010-09-30 17:36:48

type of capacitor used in circuit electolytic or non if electrolytic then polarity should given.... and which transformer is used 12-0-12 to 240 or 240 to 12-0-12.. i.e. prymery and secondary.. and batterys ah i think it should greater than 115ah..and is compalsury to parallel 6 TIP35C.. why 6.. and can i use normal NPN tran ...

Oli2010-10-24 07:54:11

Just to agree with Nigel - this circuit is indeed unregulated and of a very basic nature, so I would not advise using it for anything other than lamps, motors etc. Not for Sensitive Digital equipment like PCs, HiFis, DVD players etc.
As Nigel says, some form of feedback is necessary for a closed loop system that will be more reliable - the standard way is to use and isolated voltage as described, there is plenty of info/circuits around on the web, based around MCUs like PICs (using PWM module to control duty cycle), or timers like 555.

Also for some folk who are asking very basic questions about current/wattage/transformers and so on, I would not advise taking on a project like this that deals with mains voltages and can be lethal if mistakes are made. I would start off by reading a book on basic electronics and power supplies, then attempting a low voltage version of this (just use a different rated transformer) or similar projects (under 50V for all voltages), like a DC to DC converter, inductor based buck/boost regulator or a charge pump. This will help to understand the theory behind switching regulators/inverters, and testing/experimentation can be done safely.
Remember - electricity kills easily, if at all in doubt then give it a miss.

chee leong2010-10-26 13:45:26

hello... ur works reali nice... izzit possible is i use the inverter to conter the DC current to AC current which generated by solar panel ? because i wan stire it in the lead acid battery for further use

sawant2010-11-14 13:24:16

can you please tell me the gauge & turns of wire in primary & secondary ?

jerome2010-12-04 20:31:44

good day sir!
thank you for uploading this schematic diagram of power inverter.hopefully i try this project.godbless!

platinum2010-12-22 13:53:40

Hi all...Ive been trying this circuit and it really works to drive my DC motor,...for inverter you can use any transformer from junk UPS with a little modification....

Alan2010-12-22 14:57:23

I would like to put my swimming pool pump onto some type of circuit similar to this ; 220v 1A 1HP motor ideally to run for about 8 hours. Is this 500 watt circuit overkill or would it be suitable for an application such as this ?

kindly reply to my email address as well please. Many tkx
Genius Replied: You need a sinewave inverter. this circuit will not run 1HP motor at its full power although it runs my washing machine motor at enough power to wash my clothes. try it at your own risk.

Amezing..2010-12-23 17:13:58

just connect parralelly yar...
E to E,
B to B,&
C to C....

Amezing..2010-12-23 17:17:50

@Alick Silomba :
polarity can be predictablel.
near zener diode u should connect -ve terminal to 2nd pin of ic 7809 i.e. ground.
& near pinn 1 -ve should connected to pin 1

Amezing..2010-12-23 17:19:08

@atif :
no at all........ yes just for a 10 min o/p

salik rao2011-01-30 20:44:27

u have mentioned above that the system will generate square wave instead of sine wave which cause difficulty in running inductive can i get pure sinosoidal wave so that i run my other appliances properly?

Bhoopendra2011-03-10 15:00:56

I want back up time calculation
Genius Replied: ( Load (VxA)) / Battery (VxA) ) x 0.70 rough estimate

MNbernal2011-03-27 06:16:12

@ dave Rejoinder to his electric car.
Please verify your design on your electric car project.
There is no need for DC-AC inverter in your project The power used for driving your car is a DC motor. where it discharges during drive, and automatically recharges your batteries when braking.The factor there is where do you get the charging power to drive say to some 50 miles. And now much Ampere hours your battery bank must have.
This is why hybrid cars come to light.

david2011-04-16 13:17:42

hello i made this inverter and it gave a very bright light with a 100 watt lamp but but my shaving machine of 10watt has refuse to atart what could be the problem thank you.
Genius Replied: Plz adjust frequency

Michael Cole2011-04-19 19:17:06

Good Afternoon Sir {Mr Genius},

Am Mike living in Nigeria and a student of Yaba College of Technology.

Sir, am sorry to disturb you with my mail, but please i need your help on production of inverter. i just saw the inverter production details which you published above, it is very ok. But Sir, i need a complete inverter system/circuit diagram with complete details, which can also charge the 12V battery or more.

Sir, i need to make a difference in my country "NIGERIA" in the production of inverter due to power failure in my country... Or if you have any idea/suggestions on how i can go about it. I will very much appretiate it. i really want to make a positive impact to my country NIGERIA. I hope this relation will go along way.

Thank you for taking your time to read this while i await your positive response.

Yours faithfully,


Fra2011-04-27 19:21:51

Thanks for your circuit!
Is it possible to modify it so that the frequency will be tunable around 15 khz?
Genius Replied: I think you can adjust it to that frequency by changing the variable resister though i dont think your transformer is designed to work at that high frequency so not recommended.

ahnad2011-05-10 23:49:10

will this inverter recharge the battery it self?
Genius Replied:No its just inverter not charger

Peter Adzakey2011-05-12 21:32:54

Thanks so much for your circuit diagram, it has helped me in my project work. Please I have a slight challenge with the testing of the inverter, I am having high frequency of about 11.05 MHz instead of the 50HZ, also I am not having any output voltage at the other side of my transformer, thus the output side. Please kindly direct me as to what to do.
Thanks for your support

Habib cpi2011-05-15 21:26:48

thank you i have sucsesfully made ur inverter circuit and i faced no problem thank u again for provaiding this circuit all the best

Peter Adzakey2011-05-17 20:49:20

Hello, Good day and I thank you for you circuit diagram, I am having some few challenges with the circuit, I looked unto the circuit to build my device but I am not getting any output and also the frequency is I am getting is very high, I am getting around 11.05 MHz. Please what can I do to get a frequency of 50Hz and then 220 VAc output. Thank you and God bless you for you assistance
Genius Replied: Recheck your circuit carefully around 4047 which deals with frequency.

abdul rehman2011-06-05 23:23:08

I need help in the attached circuit ..
I have made this circuit , it works on the the 100w bulb and energy savers but it is not working on fans a and inductive load , i have also set the frequency around 50 hz with the help of a potentiometer but when i connect the 35w fan , the frequency at the output of the transfomer seems 230hz or sometimes 300hz ..please help me in this regards
Genius Replied: Please adjust frequency while under load like connect the fan and then adjust the frequency.

OLOYA2011-06-13 00:31:32

I would like to know how long does this inverter last when using a 12v car battery with a load of a 14"Tv set.
I built one,but just wanted to know which battery type could be the best.Highlights me about a lead & acidic battery,which one is the best for inverters!
Genius Replied:Check your Tv's Watt rating from its back and divide it with your Battery's Watts (VxA) that will give you max possible theoretical time. practically you should also take into account the conversion losses so time will be roughly 2/3 of the theoretical time you get assuming your battery is fully healthy.

salik rao2011-07-06 23:51:40

can i use this circuit for an output of 120v,if no than what should i suppose to do?
Genius Replied: use 24V-0-24V Transformer. that will give you 120V

Adamuabbaadam2011-07-18 14:44:48

Good day pls i am an electronics suppose little watt require to power 1-70 led can i use 12v -500mW transformer and reduce the transistors to 2-2 For the cct if i use 12v7 AH/20HR .For my workshop you like the idea? Best regard to you
Genius Replied: Yes you are safe to use small transformer as long as its still 12v+12v from 220v but i think 12V 500mw transformer is probably too small as it will output only 6W at max at 220V.

sah newton che2012-01-09 18:49:27

i sah newton from cameroon i built the circuit and discovered that the power was less than 500w.what can i do to uptimise the power to 1000w

Binny bajaj2012-04-21 15:40:33

Just to agree with Nigel – this circuit is indeed unregulated and of a very basic nature, so I would not advise using it for anything other than lamps, motors etc. Not for Sensitive Digital equipment like PCs, HiFis, DVD players etc.
As Nigel says, some form of feedback is necessary for a closed loop system that will be more reliable – the standard way is to use and isolated voltage as described, there is plenty of info/circuits around on the web, based around MCUs like PICs (using PWM module to control duty cycle), or timers like 555.

Also for some folk who are asking very basic questions about current/wattage/transformers and so on, I would not advise taking on a project like this that deals with mains voltages and can be lethal if mistakes are made. I would start off by reading a book on basic electronics and power supplies, then attempting a low voltage version of this (just use a different rated transformer) or similar projects (under 50V for all voltages), like a DC to DC converter, inductor based buck/boost regulator or a charge pump. This will help to understand the theory behind switching regulators/inverters, and testing/experimentation can be done safely.
Remember – electricity kills easily, if at all in doubt then give it a miss.

simon2012-05-26 23:57:33

Sir, i have build the circuit but the output is between 120volt & 150volt but it should be 220volt. i have changed transformer but it still gives me 120volt output. please help me out.

sai teja2012-10-02 11:10:48

i built up the circuit, it is working but the out voltage is only 200volts and on loading with a 60watts bulb the output voltage is dropping to 80volts i dont understand where the problem is please help me

more genius2012-12-09 02:22:56

Hi to every one! Genius last appearance here was last November 27, 2009 at 9:42 pm - 3 years ago, I do not know what exactly happen to him but i guess he or she is tired of answering basic question over and over again, or maybe very busy now in doing some business. You guys please do some research on the internet as you use to do for some reason and not being clog here. Anyway many thanks to genius who shared this basic, simple and low cost inverter circuit.

yeasin2012-12-20 00:34:23

bro i have 12-0-12 transformer in my inverter its so 220 volt but when i want to use 30 watt lam its really going down like 88 volt so please have u some advice for that
my inverter is 500 watt i built

GOKUL2012-12-30 18:33:20

I made this same circuit but i have only 300w output
tell many TIP35C is connected in parallel

Hadi SH2014-01-05 17:47:02

In the Name Of Allah
Dear genius!
Thank you for your Share!
It is one of the best circuit That I see to now!
Thanks a lot!

jun2015-02-26 08:16:27

hi sir,i built ur iverter circuit and it works on ligthing,t,v but not on electricfan why,my inverter is 1000 watts my transformer is 45 amp,12 volt 40ah deep cycle battery
Replied:@jun please adjust frequency variable

Generalomosco2015-03-29 20:29:22

Please what ic or transistor can i use to replace ic7809 simultaneously can i use 7.1v 0 7.1v transformer for this circuit?
Genius: No you cannot, this will result in output voltage in excess of 400V. Please only use 12+12 transformer

Emma2016-04-02 04:05:11

Thank you for building and posting this inverter circuit. Please, I want to know if I can use HCF4047 in place of CD4047. And also if I can use high current mosfet or power transistor to drive the transformer.

Dewkaran2019-07-17 04:07:46

thanks for making a simple circuit, Can I use other transistor instead of D313?

Samuel2019-08-06 13:09:31

Plz why is it that d inverter i build cant drive a motor

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