100 Watt Inverter Circuit

admin November 27, 2018 233 Comments

100 Watt Inverter-Circuit Diagram, Parts List & design Tips

Inverters are devices that convert DC input supply to AC (alternating current). They are also called power inverters.

Power inverters have numerous applications in power electronics field. It is used in various applications like induction heating, UPS, controlling electric motors, refrigerators, solar and many more.

A 100 Watt inverter can supply a maximum power of 100W. The wattage is just a measure of how much power a power inverter can deliver. So if you see a 500W inverter that means that particular inverter can deliver upto 500W.

I believe this is a good DIY project that is enjoyable for both newbies and hobbyists alike.


Here is a 100 Watt inverter circuit using a minimum number of components. I think it is quite difficult to make a decent one like this with further less components. Here we use CD 4047 IC from Texas Instruments for generating the 100 Hz  pulses  and four 2N3055 transistors for driving the load.

The IC1 Cd4047 wired as an astable multivibrator produces two 180 degree out of phase 100 Hz pulse trains. These pulse trains are preamplified by the two TIP122 transistors. The outputs of the TIP 122 transistors are amplified by four 2N 3055 transistors (two transistors for each half cycle) to drive the inverter transformer. The 220V AC will be available at the secondary of the transformer. Nothing complex just the elementary inverter principle and the circuit works great for small loads like a few bulbs or fans. If you need just a low-cost inverter in the region of 100 W, then this is the best.

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Inverter Circuit Diagram with Parts List.

Inverter Circuit

100 Watt Inverter Circuit Diagram


  • A 12 V car battery can be used as the 12V source.
  • Use the POT R1 to set the output frequency to50Hz.
  • For the transformer get a 9-0-9 V, 10A step down transformer. But here the 9-0-9 V winding will be the primary and 220V winding will be the secondary.
  • If you could not get a 10A rated transformer, don’t worry a 5A one will be just enough. But the allowed out put power will be reduced to 60W.
  • Use a 10 A fuse in series with the battery as shown in the circuit.
  • Mount the IC on an IC holder.
  • Remember, this circuit is nothing when compared to advanced PWM inverters. This is a low-cost circuit meant for low scale applications.

Inverter Design Tips.

The maximum allowed output power of an inverter depends on two factors. The maximum current rating of the transformer primary and the current rating of the driving transistors.

For example, to get a 100 Watt output using 12 V car battery the primary current will be ~ 8A, (100/12) because P=VxI. So the primary of the transformer must be rated above 8A.

Also here, each final driver transistors must be rated above 4A. Here two will be conducting parallel in each half cycle, so I=8/2 = 4A.

These are only rough calculations and enough for this circuit.

We have more Inverter Circuits that you may like to read and understand;

1. How to make an Inverter

2. Simple 100 Watt Inverter

3. 60 Watt Inverter using Transistors

    September 4, 2015

    can we increase the voltages at the side of secondary of transformer from (9-0-9) to (12-0-12) using
    different values of transistor.. if any possibility is their so ,…inform me,…otherwise tell me from where i can get ( 9-0-9 , 5A) transformer.

  • haseeb chaudhry
    July 31, 2015

    sir plz i need help… i am going to work on full efficient inverter… for this purpose i have an aasignment that i need mathimatical calculations of your circuit… so plz help me for this purpose…
    note: for other people who have worked on inverter or still working on it… plz i need help from those also because i am newly working on this project. thanks and contect me plz

  • Suresh
    April 13, 2015

    Sir can you please send me the circuit diagram of 1000watt inverter

  • ogunkunle kehinde
    March 14, 2015

    pls, help me out. i want learn more about inverter. if i want to produce 1000w, how do i do it?

  • praveen
    March 12, 2015

    Sir I tried this inverter design but I am not getting the required output. I am getting only 18Vac. Also after few seconds the 5 watt resistor(r7)(only that) begins to heat up and burn. Any ideas what could possibly have gone wrong.

  • luffy
    February 3, 2015

    Sir need help. I had already done with the circuit but my output are not stable. My output voltage is only 40Vac and my frequency is very high. I want to set my inverter to 60hz but my minimum output frequency is 80hz. What I’m gonna do with this sir please help me. Thank you very much.

  • luffy
    February 2, 2015

    Sir need help. i already done with the circuit but i can’t achieved 60 hz and 220volts. my output frequency is very high and my output voltage is 40V only. what i’m gonna do with this sir?

  • shreya ss
    June 22, 2014

    can i use 12v 10Ah battery,,,?.is it makes any damage to the circuit,,?.
    replay me

  • shreya ss
    June 22, 2014

    Hi frenz i want a PCB(glass epoxy) for the above ckt,anybody give it for cost pleez…replay me

  • vasudev
    June 2, 2014

    hi which is the best one ,i mean is the inverter using mosfet(& cd4047)is bettter or this

    • Seetharaman
      June 3, 2014

      Mosfet will be superior as its on resistance is quite small comparing to bipolar transistor counterpart. So the loss in the final stage will be quite less. Heating also will be less. Most important is MOSFETs cannot be destroyed due to thermal runway, as they are of PTC characteristic.

  • vasudev
    June 2, 2014

    hi which is the best one ,i mean is the inverter using mosfet9& cd40470 is better or this one

  • Jothiprakash
    March 12, 2014

    shall we use this for converting the 12v to 440v?

    • Seetharaman
      May 13, 2014

      yes by using a suitable transformer. ( only RY not three phase)

  • prashanth
    November 29, 2013

    what rate of battery required this ckt

    • Seetharaman
      November 29, 2013

      Hi Prashanth with 12 volt 100va inverter with an efficiency of say 80% you have to feed in as 125VA. That is 10amp current from 12volt battery. for say 5hrs running non stop you require a 12 volt 50AH battery.

  • prashanth
    November 14, 2013

    I want a load regulator circuit diagram for the above ckt

  • dafe
    September 24, 2013

    this inverter circuit does the batterty charge when there is power from the electric company or it only inverts (give out power)?

    • Seetharaman
      November 29, 2013

      It is only an inverter you require a charger circuit as per battery rating.

  • Geo George
    July 27, 2013

    I’m an electronics student.. kindly help me with some tips so that i can convert my 600va computer ups into an inverter. i have an external battery ,to replace the 7 ah internal battery. what changes are to be made??

  • Alo
    July 21, 2013

    Is there any video i can watch to enhance proper understanding of this inverter eg youtube.com etc …

  • June 27, 2013

    The pin 12 of cd4047 is to be grounded for the circuit to work.

  • vinith
    April 21, 2013

    can any one tel me the working of a 20 watt inverter

  • Vique
    April 7, 2013

    This project sounds good..can someone please send me the full details?.i.e block diagram,calculations n the design.please.

  • March 31, 2013

    I want a circuit that works as a duel charger(600-800 watt)Inverter AC & Solar Parallel And If possible Need Separate Circuit of Solar Charging with battery full charging Controller with auto cut and if need after solar charging battery itself can get charge form AC.Basically Add on Circuit that be integrated with existing 600-800 watt Inverter used 12v 180Ah Inverter battery.Its Need if possible solution.reply on my mail.

  • vinith
    March 16, 2013

    is the curent ratings necessary for the components to function……we r using a 2 amps 12volt supply…..

    • Seetharaman
      April 2, 2013

      Hi Vinith The supply will give you 24VA with an efficiency of say 70% you will get around 16VA. For this circuit with the rated transformer in circuit you require a 12 volt 12Amp power supply.

  • Nani ramesh
    February 23, 2013

    What is the output voltage of ic

  • nani ramesh
    February 18, 2013

    respected sir,i appreciate your circuit,can you give full of it’s working operation………..plz

  • gokul
    January 15, 2013

    please can you send me 200 watts inverter circuit diagram

  • Sarah Paul
    January 7, 2013

    sir,is there anyway to get a sine wave output instead of square…or is there any additional circuit that could do the job…plz reply sir,i am doing a project on this…

  • January 7, 2013

    sir i.m working on this circuit from two months but output voltage is 0.only two transistors of one side are heating. i,m using 12-0-12 transformer?

    • abdullah
      May 11, 2014

      hi malik i am a student of electronic engineering . i want to mae an inverter circuit. i am working on this circuit from 15 days and same problem i faced my one yransistor is heated and output is 0.do you have any circuit.

  • Hassan
    December 11, 2012

    Can anyone tell me which IC can be used as an equivalent for IC CD4047 used in the cicuit?

    • gokul
      January 15, 2013

      please can you send me a 120 watts inverter circuit diagram

    • monish
      January 17, 2013

      hey friends any buddy know itz PCB diagram……I wanna make this I bought its components but I dont have its PCB diagram…plz help me any lovable friends….

  • Hassan
    December 6, 2012

    If someone has done it simulation on MATLAB or Multisim. Can you please post it here. I’ve problems doing that!

  • jumana
    December 5, 2012

    is it ok to use transformer with 12 0 12 rating ?

  • naseri
    December 2, 2012

    hi im naseri i need project boost 10 t0 20 volt 20 wat please post me the circuit of 20 wat

    tank you

    November 29, 2012

    I’m seeking circuit diagram of Powercom UPS 1200-A. Pls send me if you can.

  • undergraduate
    November 27, 2012

    respected sir ,what is the current rating of battery ?and we are using 10 A transformer in reverse order ,it means we ve to supply now 10 A to tranformer to get the required 100 W power ,is it right ?and can this ckt can supply 10 A through transistors ?plz peply quick i m making this project . or any one in this forum can guide me

    • rohin
      November 28, 2012

      hi you can use battery up to 100ah. 100amp battery is ideal for this circuit.there is so many things to understand for this circuit.you can use ups battery 7amp but for a life of battery it should be charge and discharge with 10% of it ah rating.the rating of transformer is not mean that we give it 10amp current to get 100w.the current of transformer increase automatic according to load.you can ask any question on my maid id is rohin.sharma83@yahoo.com. happy to help you.

      • undergraduate
        November 28, 2012

        can i use 12 v,5Ah battery for this circuit ?i think 100ah is too much ,will not this high current rating can destroy the ic ?second i know a formula for transformer, primary power (vp ip )=secondary power (vs is ) we are taking primary voltage vp =220 volt ,primary current should be ip =0.45 A (as 220vp x 0.45 A =100 WATT ) .secondary voltage vs =9 volt we are delivering then by formula is =vp x ip /vs
        =10 A that we should ve to supply to get ip =0.45 A (now plz tell me is this formula ,my concepts and calculations are right ?and how a load can increase transformer currrent ratting ?plz reply soon i m waiting

        • rohin
          November 29, 2012

          you can use 12v 5ah battery but then use only 50w load for safety and long life of a battery.my dear it look like you are new in electronic so its become difficult for you.how can high current can harm the ic.it will brust only when you give high voltage.your formula seem headache and your calculation is very wrong.here is 220v side is secondary and 9 0 9 which mean total 18 v is primary and why you are calculating with 10amp and 9v . 10 amp is max transformer rating for safety.it never mean that we give it 10amp to get 220 v.i told you that current of transformer primary increase when you connect a load on it secondary.it does not mean that a load can increase the transformer current rating it will remain same all the time which is 10amp in this circuit.

          • undergraduate
            December 5, 2012

            basically i m in 3rd term and new to electronics ,and got confused in mathematical calculation ….i got ur concepts ….i practically perform this circuit ….by my opinion its giving square wave …will this sort of wave not harmful for appliance although they are low power appliance …can this decrease the life of appliance ?if i want to convert it to 200 watt how much current rating transformer will then i ve to used ?can we convert this wave to modified sine or quasi square wave and thnx for ur all replies sir …

  • November 15, 2012

    can i use this circuit for battery charging also, if yes then how?

  • Jeyakumar
    November 7, 2012

    haribalaji u number missing,i want to 100watts circuit

  • Adnan Ahmad
    October 19, 2012

    my 100 watt invertor not running plz help me?

  • October 14, 2012

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  • vasanthan
    October 11, 2012

    what is the ampere rating for the 12V battery?

  • October 9, 2012

    very good simple circuite and easy to available in the shape.
    thanking u….

    • Jeyakumar
      November 7, 2012

      haribalaji u r number missing i want to 100watts circuit details tell me

  • c.m.vel
    September 24, 2012

    how much the 100W circuit price?

  • Zaid
    September 14, 2012

    sir can i use 12-0-12 2 amp transformer

    August 23, 2012


    August 19, 2012

    thanks for ur provide

  • dhanasekar
    August 19, 2012

    what value resistor can be used instead of pot resistor pls rply me immediately to my mail

    • Seetharaman
      August 21, 2012

      Hi Dhanasekaran it has to be a pot to set the oscillator frequency to 50Hz, this cannot be avoided due to component tolerences.

  • August 18, 2012

    is this circuit applicable for computers?

  • August 10, 2012

    sir i am a learning person…in this circuit battery charger include.?

  • vijay raja
    July 30, 2012

    sir when i connected this circuit and gave a 12v 7.5A supply,the zener diode D2 burnt…
    shall i knw the reason of this & the error in my circuit…???

    • Seetharaman
      August 1, 2012

      Hi Vijay please see my comment dated 2nd May 2010, the modification has to be carried out for the inverter to function.

  • Seetharaman
    July 20, 2012

    Dear Scott this circuit with the standard transformer can work upto 100Hz max. For higher frequencies you require special transformers and drive circuits, which will not fall under this project

  • Scott McKie
    July 19, 2012

    Dear Sir,
    Can this circuit work at a multi-kHz rate in order to chafge up a high voltage capacitor bank attached to the secondary? The rate would be around 450kHz.
    Thanks in advance,

  • Rajib Banerjee
    July 19, 2012

    I want a circuit that works as a duel charger(600-800 watt)Inverter AC & Solar Parallel And If possible Need Separate Circuit of Solar Charging with battery full charging Controller with auto cut and if need after solar charging battery itself can get charge form AC.Basically Add on Circuit that be integrated with existing 600-800 watt Inverter used 12v 180Ah Inverter battery.Its Need if possible solution.reply on my mail.

  • July 16, 2012

    Hey thanks about the circuit.
    can i load a computer with a 5 ampere transformer????
    Because I’m going to build one.
    If it’s not possible, please let me know how to do it.
    I need it so much.please!!!!
    thanks a lot.

  • June 21, 2012

    sir, would all the 6 transistors be mounted on a heatsink and what are the required dimensions? for how many minutes will this be running until the batts are dead? and if i connected in parallel 2 car batteries will it work twice as long with only one batt?
    thanks in advance really need your help

  • avinash
    June 17, 2012

    Sir can u give me any high volt circuit

  • May 25, 2012


    I am searching circuit for solar charge controller(PWM and MPPT).

    Please help me.

    With regards,

  • zama
    May 23, 2012

    the circuit works well but i dont know the full operation.

    • Lawrence
      July 24, 2013

      Did you do any modification to the circuit?

  • zama
    May 23, 2012

    hi, sir {i want to know the whole operation of this 100 watt inverter circuit.

  • Dinesh
    May 18, 2012

    can i use 230v ac to 9v ac step down transformer or 230v ac to 12v ac step down transformer as t1

  • May 18, 2012

    I love circuits

  • seetharaman
    April 30, 2012

    Hi Adnan 2N3442, 2N3773, 2N6254, MJ15003, MJ15022, can be used.

  • adnan khan
    April 29, 2012

    hello sir I asked you aquestion about transistor 2n3055.plz tell me this alternative transistor who can be used in the inverter

  • ktjayaprakash
    April 18, 2012

    I want to start 3 cfl inverter. Please give circuit 45 watt 12v 7.2ah battery
    Yours faithfully,

  • Amit
    April 3, 2012

    hi, i want to build a 300w inverter, what changes do i need to make to the circuit?

  • indrajoti
    April 3, 2012

    I want to make dc12v input & ac230v 200W chopper type inverter circuit diagram please support me

  • channa
    April 1, 2012

    what is the necessity of using diode? please reply.. fast..

  • Nuhu Chiduo
    March 27, 2012

    Sir,i need to design an inverter to be used for tv and charging telephones,please if you have a practical circuit diagram,please help me.Mail me please.

  • Dhanasekaran
    February 22, 2012

    Hello sir,
    I want to make the DC(12V) to AC(230V) “pure sine wave inverter circuit”. Please if you have any circuit or ideas please mail me or post here. I want the circuit design for minimum 100W power output with 230V pure sine wave.
    Please reply me i am waiting for your reply!
    thanks all……

  • deepak
    February 21, 2012

    Hello sir,
    I want to make the DC(12V) to AC(230V) “pure sine wave inverter circuit”. Please if you have any circuit or ideas please mail me or post here. I want the circuit design for minimum 100W power output with 230V pure sine wave.
    Please reply me i am waiting for your reply!

  • Seetharaman
    February 19, 2012

    Kiran you can use with 14″ TV. most of the LCD monitors consumption are around 130 to 190 watts, hence may not be possible to use. check the TV power consumption and use if it 100watts or less.

  • kiran
    February 17, 2012

    can i switch on a TV?

  • Seetharaman
    February 17, 2012

    Hi John since we are using 10 & 11(f/2 complimentary output), 13 is not required. The above application is correct please (refer my comment dated 20th july and)follow. Around INR500(price depends mainly on the quality of the transformer)

  • john Bhat
    February 16, 2012

    does pin no. 12 and 13 remains unused????? in CD4O47 pin no. 13 is oscillator.what happens if we use it in the circuit?????

  • john Bhat
    February 16, 2012

    how much will it cost????? plz rply

  • seetharaman
    February 11, 2012

    Hi Raju you have to use a 12volt battery with 50AH capacity. for 100watts for 5 hrs backup.

  • raju
    February 10, 2012

    how much the cost for 5hr backup one

  • seetharaman
    February 5, 2012

    Hi Sathish IC1 is the oscillator with complimentary output. which switches on driver transistors Q1 and Q2 alternately. Which in turn switches on the output parallel pairs Q3,Q4 & Q5,Q6 alternately. Due this action the primary winding of the transformer is switched on alternately with 12 volts. this waveform is stepped by the transformer and it gives you the stepped up 220volt square wave output.
    Hi Stevebit please go through my 20th july comment. kindly carryout the modification for the circuit to work.

  • sathish
    February 3, 2012

    can u tell d stepwise procedure how it works???

  • stevebit
    January 11, 2012

    hi any one from kent in here cos im working there next week and need a bit advice on best hotel the company i work for pays the bill
    steve bit

  • alfred beilin
    January 2, 2012

    good day everyone all the best to yous for 2012
    alfred beilin

  • haidar
    December 19, 2011

    hi sir,can u give me latest schematic diagram include modified circuit..i already try this circuit but not give correct output voltage..
    thanks for the help 🙂

  • seetharaman
    December 16, 2011

    Hi Haidar it is rated for 10 to 12 amps (9-0-9 @ 100VA rating)continuous rating.

  • December 16, 2011

    Hai.. I want to construct a simple 100watts inverter..
    I hve 12V bttry lead acid.. How much time it wl gve supply when battry is fully charged.

  • December 16, 2011

    Hai .. I want to know ,in inverters, whether we hve to use only step up transfmr or normal step dwn trnsfmr in reverse.’ sir plz reply me.. I hve stopped my inverter projct for this doubt..
    Thank u..

  • StarD14
    December 16, 2011

    How much amps for transformer 9-0-9/230v should i used?

  • haidar
    December 15, 2011

    what the amp of transformer 9-0-9/220v

  • seetharaman
    December 14, 2011

    Please refer to my 22nd July comment on the above, you have to carry out the modifications indicated. you can replace BY127 with 1N5407.

  • StarD14
    December 13, 2011

    Hi sir, i already test your circuit, unfortunetly the zener diode 9.1v, 500mW damage.
    What can i do?

    I also have several other question to ask.
    1.How much amps for transformer 9-0-9/230v should we used?
    2.can i replace BY127 diode with 1N4007?
    3.how many volts and watts for this diode.

  • Seetharaman
    December 12, 2011

    Hi Hyder the transformer winding will be switched on by Q3,4 and Q5,6. hence you have to use a center tapped transformer.

  • haidar
    December 10, 2011

    hi sir..it is compulsory to use center tap transformer?can i use normal transformer?

  • ram
    November 30, 2011

    hi, i want 100w inverter board. i am in trichy now. here the inverter boards are not available. pls send me the adress and any electronics stores in tamil nadu

  • eltee
    November 17, 2011

    pls i urgently need a 300W or 500W inverter circuit diagram and reasons for using rated components its for my final year project….

  • wyclif
    October 24, 2011

    pliz send me 500watts,600watts,7oowatts,800watts,900watts and 1000watts inverter circuit diagrams.send them to my email

  • seetharaman
    August 20, 2011

    Hi Tapas you have to use 11-0-11 for required output. CD4047 output drive current is much higher than hcf4047. ref my july 20th comment on this. have you carried out the required modifications. you can try reputed make 2N3055 or BD249.

  • tapas
    August 17, 2011

    is hcf4047 work insted of cd4047.
    the 2n3055 transistor are getting heated.
    if i use 15-0-15 of 3A.
    reply me soon

  • Shelly Jardin
    July 25, 2011

    Thank you very much I will try that.

  • seetharaman
    July 20, 2011

    Hi Shelly see my earlier comment.
    May 2, 2010 at 7:40 am
    Hi Imteaz A small change to be carried out in the circuit for proper operation. Shift +12 volt to fuse. include 470 ohms between fuse and supply of IC 4047 (between fuse and zener with 220uF capacitor). Add 4700uF 25volt capacitor in parallel with 0.1uF capacitor between centre tap of out put transformer and supply negative, nearer to 2N3055 emitter resistance(in other words in parallel with D1 BY127). You can connect 2 more 2N3055 also Q1 and Q2 can take care. IC can give a drive of 1mA which is sufficient to drive 4 to 5 2N3055 transistors through TIP122. Do not forget emitter resistance for 2N3055s. Increase fuse rating to 20Amps. Out put transistors wire dressing will be critical and important be careful.

  • Shelly Jardin
    July 19, 2011

    I have been trying to build the inverters as a side project and I used both your 100W schematic and the 60W schematic and purchased everything as you have them. I put it all together but am getting nothing when I put the 12V to them. Do you have a troubleshoot guide that I can see. I have gone over each connection several times and it is as it shows on the schematic. Please reply soon. Thank you.

  • seetharaman
    June 28, 2011

    Please read my comment dated 2nd May 2010. Carryout those modification. this is the best circuit for your UPS.

  • M waqas
    June 28, 2011

    i want to make small ups… is that circuit absolutely right to implement..?????

  • June 16, 2011

    pls Sir I need the details of the function of each component and all possible calculation done on the circuit, why the component are there and why that value. I really need it urgent for my project defence at school. I mean the 100 watt inverter. Thnx Sir, God bless you.

  • lalit
    May 17, 2011

    kindly provide me the proper PCB layout of the diagram

  • usman
    April 19, 2011

    Send me 500w circuit

  • usman
    April 19, 2011

    i need to know that how much load a circuit can drive(100w inverter)?
    means how many fans and energy saver for how much time can be drive

  • Seetharaman
    March 13, 2011

    Hi Musthafa 0.022 is 22nF (22KPF or 22000PF). Measure the voltage at Pin No 10 and 11 with respect to common negative. If oscillator is running the DC voltage should be half the supply voltage. If R1 is kept at minimum value the frequency will be less and you can see the voltage at Pin 10 & 11 raising and lowering (with an analog meter the needle will kick). If the voltage at Pin no 10 & 11 are either high or low continuously, indicates the oscillator is not running.

  • musthafa
    March 13, 2011

    Thanks Frnd,How to check Ic4047 is working or not,And equvilant value of capacitor 0.022uf

  • Seetharaman
    March 6, 2011

    Hi Musthafa you can use 1N5408 for BY127 R2 and R3 can 1/4 watt better use 1/2 watt as per ADM recommendation.
    CD4047 10 & 11 are complimentary out put to drive output pair. 7,8 and 9 are connected ground (-ve of the supply)
    4,5,6 and 15 should go to the +ve of the supply

  • musthafa
    March 5, 2011

    My ID E-mail Address

  • musthafa
    March 5, 2011

    HI! please tall me equvilant value of diode D1 BY127

  • musthafa
    March 5, 2011

    Hi Seetharaman i Dn`t know to use the website & please tell the answers for my before comments.

  • Seetharaman
    March 4, 2011

    Hi Mustafa circuit is ok. except for the mistake please refer to my comment dated 2nd may

  • musthafa
    March 4, 2011

    what is the equ diode for D1 BY127

  • musthafa
    March 4, 2011

    R2 and R3 value is 1/4 W it is the correct or not

  • musthafa
    March 4, 2011

    i am sorry. the out put is 15v in first half & 16v second half.(i am check in d1 anode side o/p is 8,9 & check in d1 cathode side o/p is 15,16)tell what can i do.

  • musthafa
    March 4, 2011

    8v in first half & 9v second half.& this circuit is wrong connection in ic4047.my gessing is the ic pins 4,14,5,6 are ground & 7,8,9,12 pins are connected in +ve supply i am right.and how much cost in transformer.what is the value of zener diode (i am check the circuit without connect zenar diode)i think it is the problem.any way thanks.

  • musthafa
    February 27, 2011

    Hi! i h`ve some problem the output voltage,oneside 9v & other side 8v(with out transformer).wt i will do & The value of transformer Wil u please tell answer soon.

    • admin
      February 27, 2011

      1V variation is not a big problem. Any way please specify on what sides its 9 and 8

  • January 28, 2011

    Sir , I like this , but I want to build 1000watt inverter circuit with solar panels.

  • January 23, 2011


  • January 20, 2011

    Thanks for sharing your thought. I’m planning to make an inverter using this circuit diagram. I hope you will give me more guides and tips on making this kind of inverter.

  • Md imam uddin khan
    January 16, 2011

    Hi, I want to make a 100 watt/12v inverter using high frequency trunsformer with common parts available in local market.please send me the document datails by e-mail.


  • akash gopi
    January 6, 2011

    sir i can’t connect the output to the main because it may cause over load, can i use one diode in out put terminal and it connect to the main or you suggest me a solution

  • Seetharaman
    January 5, 2011

    Hi Akash 1/4 watt will do.

  • akash gopi
    January 5, 2011

    thank you sir and one more doubt what is the wattage of R2&R3

  • Seetharaman
    January 4, 2011

    Hi Akash 100watts say efficiency is 80% 125VA input to final transformer. That is 12 volt at 10Amps approx. So for 1hr 10AH battery. for 3hrs 30AH battery. standard car batteries are 12 volt 40AH. you can use them. the cost of battery is around INR2500 and the inverter electronics with torroidal trasformer may cost you around INR700

  • akash gopi
    January 3, 2011

    sir i need 3 hour back up which battery can use,what is the total cost for this inverter

  • Seetharaman
    November 11, 2010

    Hi Thilina you want the circuit or assembled emergency lamp itself

  • Thilina
    November 11, 2010

    Can someone please send me an emergency lamp. that can be run at least 2hrs , using 6V battery, and mobility

  • Seetharaman
    November 3, 2010

    Hi Vivek Mount one group of transistors in one heat sink directly. insulate heat sinks from chassis. Wire the IC in a standard pc board and inter connect. Regarding power supply modification please refer to my comment dated 2nd May. without the modifications you will blow the zener diode.

  • vivek
    November 1, 2010

    please tall me layout of 100w inverter. and how can i make it.

  • Seetharaman
    October 23, 2010

    Hi Ruchir pl refer my earlier comment on may 2nd.even after modifying if it is not working, check the output at cd4047 pin 10 and 11. if there is no output the IC may be defective or the timing components are not properly getting connected.
    Hi Gopi refer my earlier comment dated aug 23rd. for 3 hours at the rate of 14 amp consumption you require a 42AH battery. 40 amps SMF car battery can be used will cost you around INR4300/- (Amron, Std, Exide etc)

  • philip
    October 21, 2010

    pls how may i get a design of 5000watts mosfet or any other type of power inverter. but it most be up to 5000watts,wit the components well indicated.countin on u hopefully. Tanx

  • akash gopi
    October 19, 2010

    sir i need 3 hours backup for the inverter, what is the AH of the battery?, what is the cost for it? Please give me reply…

  • ruchir
    September 16, 2010

    hey my inverter is not even working….. checked all the components four times…. please suggest me a way out….

  • seetharaman
    August 23, 2010

    Hi Anoop Q5 & Q6 are also 2N3055 like Q3 & Q4. Say inverter efficiency is 80% for 100 watts load you require 125VA input with 12 volt battery you require 14 Amps current. Hence with 7AH battery you will get approximately just less than 30minutes.
    Hi Imran You can change the frequency to your requirement with pot R1. Zener to regulate the supply to the IC oscillator so that its frequency output is stable. There is a mistake in the circuit refer to my earlier comments on 2nd May.

  • Imran
    August 15, 2010

    Hi! Wil u please tell u know about the function of zener diode n can v replace the ic cause its in astable mood so v can use any in this mood……n y here 2 100hetz in this y not 120hetz… Please give me reply…

    August 7, 2010

    Hi, Can you tell me the values Q5 and Q6 and calculate the working hours of 100w equipment with 12volt,7Ah battery? please

  • Seetharaman
    July 19, 2010

    Hi Daniel battery DC to covert to AC there will be a loss of 25% and again convert AC to DC and charge battery another 25% loss. Hence this is not viable proposition. It is something like connecting motor to dynamo mechanically and connecting dynamo and motor electrically thinking that it is perpetual and run for ever if you take all the losses into consideration this is not viable. Say even if it is 100% efficient what are you going to achieve, you cannot tap power from the system due this loss the system will collapse.

    July 19, 2010

    I am thinking of designing an inverter in which its output(AC),is fed back to charge the battery when it undergoes low voltage and vise versa,and this oscillation goes on continuously,ie,automatically.
    Can you provide me a full circuit diagram with parts list?
    Thank you in advance.

  • seetharaman
    May 2, 2010

    Hi Imteaz A small change to be carried out in the circuit for proper operation. Shift +12 volt to fuse. include 470 ohms between fuse and supply of IC 4047 (between fuse and zener with 220uF capacitor). Add 4700uF 25volt capacitor in parallel with 0.1uF capacitor between centre tap of out put transformer and supply negative, nearer to 2N3055 emitter resistance(in other words in parallel with D1 BY127). You can connect 2 more 2N3055 also Q1 and Q2 can take care. IC can give a drive of 1mA which is sufficient to drive 4 to 5 2N3055 transistors through TIP122. Do not forget emitter resistance for 2N3055s. Increase fuse rating to 20Amps. Out put transistors wire dressing will be critical and important be careful.

  • Imteaz
    May 1, 2010

    Can I increase wattage by adding another 2N3055 parallel to these two. If so is there any other changes required (for Q1, Q2, R2, R3)?

  • Imteaz
    May 1, 2010

    Will it be very harmful if I use 120W load?

  • seetharaman
    April 21, 2010

    Hi Sat the ampere hour capacity is given on the battery by the manuacturer. If you use 6 volt 7 ah two numbers in series, then 12 volt 7ah will be the capacity of the battery.

  • Sat
    April 20, 2010

    Hai,how to check the battery ah,

    i have connect the two 6v battery whether, the 12v battery

  • Sayyed Aamir Bashir
    April 10, 2010

    Thanks 4 publ such a ckt. Every electronic professionalist gets lots m

    Sent on a phone using T9space.com

  • Imteaz
    April 10, 2010

    Can the watt of this inverter be increased? Can I use powerful transistor to increase wattage? What kind of wave output of this circuit (sine or square)?

  • Arman
    April 5, 2010

    Can any one give me the pcb layout of 100watt inverter..Its an urgent…Plz

  • spider
    April 3, 2010

    thanx a lot:-))

  • seetharaman
    April 2, 2010

    Hi Pin 14 should be connected to plus 12 volt supply. 12 & 13 not to be used as we donot require those functions. If you have a multimeter you can check the out put voltage connect a 60Watt bulb and try whether the glow is not flickering. if you have a frequency meter check for the frequency at the out put. if you do not have any test gear connect a bulb if it is glowing alright, connect a 230V 50Hz table fan to the inverter output and slowly turn the frequency pot till the fan speed gets peaked(runs almost at the same speed like when it is connected to mains supply). in this crude method you can adjust the freq. approximately.

    April 1, 2010

    what to do with the remaining pins 12,13,14 of the IC 4047?
    how to check the operation of each component when i connect a 12 v Dc supply?..
    how to know whether the POT R1 is adjusted at 50Hz?
    please reply:-(

  • seetharaman
    March 21, 2010

    Hi Hamisu Ahmed kindly send your your fine designs to Circuits today. we will all be benifitted.
    thanks. awaiting your designs

    • Shivam Rathour
      September 22, 2017

      Sir i need help in this ckt hcf4047 ic used at place of cd 4047 and burn the zener doide pls tell me this rating and how to check the ckt .when i tested in the point of Q6 collecter and emiter is not safficiant votlge
      Sir plz reply my email id or whatsaap number 7398403915

  • hamisu ahmed
    March 21, 2010

    design of electronic circuits is my field of study (bsc. physics)

  • shakti
    February 15, 2010

    tel me about i/p o/p pin configuration of ic A316J use in inverter

  • judekingsley c
    February 9, 2010

    this circuit is very much fantastic but pls. can you help me with a 1000winverter circuit diagram

  • peter
    February 4, 2010

    sir can u send me pure 300 – 500watts sine wave circuit diagram that can use for my laptop and printer

  • kashif
    January 22, 2010

    my email is kashif_faiz@yahoo.com

  • kashif
    January 22, 2010

    can some one send me the 1000 watt invertor circuit if greater its fine thx

  • kashif
    January 22, 2010

    hey there thax for this circuit i been working with the solar cell for quite some time and this invertor circuit is just what i need could you please send me some more of these with proper ratings and i also need the controller circuit between the solar pannels and 12 volt car batteries as is very important for solar cells to generate energy

  • Seetharaman
    January 16, 2010

    Hi Jeffreywong you can use sine wave oscillator circuit appeared in Circuits Today using ICL3038 with a buffer and a push pull power amplifier using diver transformer, MOS Fet transistors and a suitable torroidal step up transformer (T1 of above 100 watt inverter circuit) you can make a good sine wave inverter with reasonable efficiency. Happy designing.

  • Sakir
    January 16, 2010

    Sir i want to know how to make 12 v battery charger and i want clear diagram about how to connect battery. Plz send to my mail.

  • lokesh
    January 15, 2010

    Dear Sir,
    i am a regular visitor of ur web, FIRST of ALL am very THANK FULL for ur services.
    I have 2 things
    1.I need a good inverter which o/p will be above 500watts
    2.How can we calculate the duration of a battery to utilize after reacharging that {i mean if we are connecting a 6v battery to an led circuit how long it may work}

  • jeffreywong
    January 13, 2010

    Hi sir, im doing a pure sine wave inverter, during the progress, i have face many problem until i cant move on to it. Can sir assist me to complete it? Or sir can send a pure sine wave inverter circuit to my mail box? emergency…

    Thanks a lot…

  • Zul_BjQ
    January 5, 2010

    Is this half-wave or full-wave inverter?from what can i understand it is a full-wave..correct me if i’m wrong.

  • rajasekaran
    January 5, 2010

    i need a 800VA inverter circuit for my project. can u anybody send the circuit soon to me…

  • obed
    December 7, 2009

    i want a 1000w invertor

  • qudeerbasha
    November 10, 2009

    hello sir ckt is good but i want the ckt to worker on solar power ies the i/p to this solar power

  • vighnesh
    November 8, 2009

    would you please send me the circuit diagram for making a 600VA inverter. Also please send me the list of components used and the instructions to make it

  • n.srinivasarao
    November 3, 2009

    pls can you send me a 500watts inverter circuit diagram with exact sinewave out.

  • October 27, 2009

    Please I need more information to perform my project on the 100-watt power inverter.

  • radhi
    September 19, 2009

    hi.. plz can u give me a circuit daigram of 600w inverter using MOSFET.. do mail it soon as possible… thank u……..

  • abdul
    September 14, 2009

    what is the value of q5,q6 transistor?

  • pirate
    September 11, 2009

    i had heard that there’s such thing as electromagnets that can cause a pc computer be paralyzed or destroy the hard disks. is it true? since its my first time to visit this site.


  • September 11, 2009

    I used the IC HCF4047 instead of IC1 Cd4047.Why so i did not get the output Sir? And I used MB1270B 12V , 8Ah(lead acid rechargeable battery). Can U please help me to get the proper output, Sir? And I want know the operation of IC & Transistors used here.

  • September 11, 2009

    I used the IC HCF4047 instead of IC1 Cd4047.Why so i did not get the output Sir? And I used MB1270B 12V , 8Ah(lead acid rechargeable battery). Can U please help me to get the proper output, Sir? And I want now the operation of IC & Transistors used here.

  • August 3, 2009

    what Will happen if I a transformer of 15-0-15

    • admin
      August 4, 2009

      Output voltage of the inverter will be reduced

  • jeffreywong
    July 15, 2009

    im looking for a most advance inverter, from 12Vdc to 240Vac inverter. If you have this kind of inverter, please share with me and send the full circuit diagram with it explanation.


  • twits4twats
    July 11, 2009

    Please remember, 230V AC KILLS.
    As ADMIN has stated, this is not a very efficient circuit and allthough it will suffice for many an application, it has it’s limits.
    If you are buliding this circuit with the intention of using it to drive a mains battery charger for a portable unit (laptop or some such thing), it is highly likely that it won’t work.
    The output of this inverter is known as a dirty sinewave and most chargers these days will not accept it as an input.
    Having said that, there are still may applications that this could still work for.
    The only way to learn is to do it.

  • abankwa
    July 10, 2009

    pls can you send me a 500watts inverter circuit diagram

  • Recently, i was making an inverter with transistors. it was drawing 0.06A but when i tried to increase its consumption for a proper output it didn’t work. is it bcause of the transistors that m using?

    • admin
      July 7, 2009

      The problem can be anything.I have few questions
      Did you got a proper output waveform in the oscilloscope?
      Have you checked the output of the oscillator section?
      Which transistor you used?
      Had the transistors burned out?
      Was your battery powerful enough?
      If you send me the circuit diagram I can help you more.
      Just mail it to info@circuitstoday.com

  • July 6, 2009

    good posts, Azzoarq is right.

  • June 27, 2009

    @ idris
    to produce 1000W from 12V DC you must have 83-85 Ampere….!!

  • delaw
    June 21, 2009

    hi, this is good for our consumption.


  • idris ado
    June 10, 2009

    this inverter is good, but i like 1000w with principle opretion

  • onyebu
    May 28, 2009

    please can you send me a detailed explanation and diagram of how i can build a 600watts inverter and a 12v battery charger

  • sil
    April 30, 2009

    thank you sir for the website you have provided. i could understand what actually an inverter is but the problem with me is what is the purpose of IC1, the diode D2, TIP122, 2N3055. and how are these components corporate eachother and all.
    could you please mail me the detail sir? i would be very much grateful.

  • sil
    April 27, 2009

    i’m here havig difficult time to understand the working of this diagram. can anyone, explain me the working mechanism of this diagram, please?

  • sil
    April 13, 2009

    i’m interested in the circuit. so, could you please advice me how should i design an inverter circuit for 1000W.

    • admin
      April 13, 2009

      i will add a 1000W inverter circuit soon.pls keep visiting

  • john
    April 7, 2009

    need help for my 500w inverter project.

  • olabode
    March 30, 2009

    cool386,please can you teach me to build an inverter starting with this circuit diagram of 100watt,and how i can increase it to 5000watts in a well explained way naming/labelling the circuit diagram in an Email

  • Chris
    March 16, 2009

    What can you do to increase the frequency? Say to 400 Hz?

    • admin
      March 17, 2009

      the frequency can be adjusted by varying R1 or C1. For 400Hz you need to decrease R1 to around 25K and keep the value of C1 0.022uF itself.

  • Mark
    March 2, 2009

    can someone provide us a charger of lead acid battery but our input is a 24V DC motor.. consider that our input varies due to variations of required 1200rpm of the motor.. plz help us.. we need this diagram as soon as possible.. plz email us at manacled_man@yahoo.com

  • Cargoo
    February 22, 2009

    Could you send me a 200 wats invertor circucit diagram, please. If it´s possible with calculation of individualy parts… It´s very importatnt for me. Thanks a lot 😉

  • February 7, 2009

    cool386 is rigth… You must using 9-0-9 to get high voltage

  • Larry
    November 24, 2008

    Thanks for this circuit diagram. Please, can you tell me where the -12Vdc will be connected.

  • sunny
    September 19, 2008

    pls can you send me a 500 watts inverter circuit diagram

    • July 16, 2012

      No we can’t.
      and if we’ve got one of that we could sell it you.
      And you must pay us about 1000$ to take it.

  • June 19, 2008

    These inverter circuits will give low output voltage unless a transformer with 9-0-9V primary is used. I’ve been building inverters for over 25yrs and know what I’m talking about.

    • admin
      July 7, 2009

      oops that was a type error when I created the circuit diagram.The transformer has to be 9-0-9. Otherways you wont get the required output voltage.
      Around 2 to 3 volts will be dropped by the circuit and what the transformer primary gets is battery voltage minus this drop (ie around 9V).Thats why a 9-0-9 to 230 V transformer is needed.
      I have corrected the diagram.

      thanks cool386 for pointing the error

  • ammar
    June 3, 2008

    I like this circuit but I need 500W UPS for my project so please post me the circuit of 500W UPS

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