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Make Simple 555 Inverter circuit using MOSFET

Do you want to learn a simple inverter circuit? The output is about 50 watts. And using a few parts and a small circuit.

Here is an IC 555 inverter circuit. Because of using 555 timer and MOSFET as main.  I experiment it to work well.

When use source is 12V battery will have the output of 220V AC 50Hz.

Table of Contents
1) The principle of the circuit
1.1) How 555 inverter circuit works
1.2) Output 555 Frequency Calculation
1.3) Why use MOSFET?
1.3.1) The component list
1.4) Building and testing of 555 inverter circuit using MOSFET
1.5) When checking all no error
1.6) Related Posts
2) GET UPDATE VIA EMAIL

The principle of the circuit

I think many peoples do not like to read many words or long reading.
So please read at simple principle inverter

inverter working principle

Firstly, DC voltage from a battery gets into square wave oscillator circuit. It produces AC voltage, 50Hz frequency.  But this is too low current.

Recommended: 555 Astable pulse oscillator

What can you do? Use the power switchings such as the power transistors or MOSFETs.

But AC voltage still is 12V.   Next, Transformer inductance voltage to rises into 220V AC 50Hz to apply load.

How 555 inverter circuit works

In the circuit above is completely circuit diagram of this project. I use IC-NE555 timer is a square wave frequency generator output of 50Hz.

555 inverter circuit diagram with MOSFET

The frequency is determined with R2-resistor and C1-capacitor.

Output 555 Frequency Calculation

If you use R2 is 150K. It is 47HZ output. You may use a potentiometer-50K in series with R2. To adjust a frequency is 50HZ

MF4Me said:
“By calculation (results will vary depending on component tolerances) a good combo of common parts would be:

  • 0.2 uf (2 x 0.1 in parallel)
  • 100 Ohm for R1
  • 72K (39K and 33K in series) for R2.
Calculation of 50HZ frequency of 555

That calculates to 50.069 Hz with a 50.03 duty cycle.

That is smart accuracy. If your tolerances work out.

What is more?

Then, we use both N-type MOSFET, IRF540 (Q2, Q3) to drive a transformer coil (primary winding).

The output current at Pin 3 of IC1 will flow two ways.

  • First, through R3 to a gate of Q2.
  • Second, flows to Q1-transistor BC549 as inverter logic form to reverse signal difference first ways.

Next, the current flows to the gate of Q3 to also drive the transformer. 

It inductance low AC voltage to high volts, about 220V to 250V.  According to the condition of the battery, 12V to 14.4V.

The circuit diagram of MOSFET Inverter

The transformer I use 2A current and 12V input at output power more than 100 watts.

Here are a few related posts you may find helpful, too:

Why use MOSFET?

In circuit use IRF540 MOSFET. There are many reasons to use them.

  1.  It is easy to use.  They do not need the pre-drive transistor in Darlington is the same as normal transistors, such as TIP41, 2SC1061 etc.
  2. It can drive high current to load, 27A max.  While the transistor (TIP41) can drive load 4A max.
  3.  It is inexpensive just 0.5US only.
  4. The body is TO-220 looks like TIP41 transistor so easy to mount on a heatsink.
  5. They can use smaller heatsink than a transistor, they are not too heat.

The component list

IC1: NE555 timer IC = 1 pcs.
Q1: BC549-NPN 40V 0.5A transistors = 1 pcs.
Q2, Q3: IRF540-N CHANNEL POWER MOSFET, 100V, 27A, TO-220; 2 pcs.
C1,C2: 0.1uF 100V mylar capacitors = 2 pcs.
0.5W resistor
R1: 4.7K = 1 pcs.
R2: 120K = 1 pcs.
R3,R4: 1K = 2 pcs.
R5: 5.6K = 1 pcs.
T1: 2A 12V__CT__12V transformer = 1 pcs.
Heatsink

Building and testing of 555 inverter circuit using MOSFET

This projects I assemble components on a universal PCB board. As Figure 2, while it operated will get little hot. So use enough heatsink.

555 inverter on universal PCB board


Figure 2

Then, check the circuit for error. Please watch the video below.

When checking all no error

We will test it with 100 watts lamp at the output. Then, apply 12V battery source. You will see that. The lamp glows. But the battery voltage is slightly low. Also, the AC voltage output is 190V.

After that, We check waveform is a square wave as shown on the scope.

Note:
Some people wonder about something. I will share with you.

The electrolytic capacitors are 470uF 50V. I put it to filter a smooth current. It does not need. If you use a 12V battery, 10Ah. Because it is a stable power current source.

Ideally, if you need full 100 watts output. You need to use 8A transformer. Because of input watts = output watts = 100 watts.

When the primary coil voltage of the transformer is 12V at 100 watts.
The output current input = 100W/12V = 8A (approximately)

555 Inverter circuit project

If it not working
I feel uneasy if you build this project It does not work.

First, you need to review well, the pin of the IC, resistors, capacitors. And the important is connecting the MOSFET.

View using IRF540 legs.

Second, should do not connect the power cord to the transformer and MOSFET.

Third, check the 555 timers working, frequency generators at pin 3 first. You may use a voltmeter to measure a voltage across pin 3 and ground. You use surely oscilloscope to watch waveform.

Check out these related articles, too:

Related Posts

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I always try to make Electronics Learning Easy.

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This Post Has 173 Comments

  1. RK Chall

    9 Apr 2014 Reply

    Nice. I will try it soon. ThanQ for publication

  2. Mark

    9 Apr 2014 Reply

    Very interesting, but I build K-bridge not center-tap.
    nice work any way

  3. Francisco Mateu

    9 Apr 2014 Reply

    estimado amigo gracias por los envios de sus proyectos son muy util
    Saludos

  4. admin

    10 Apr 2014 Reply

    Hi,RK Chall

    Thanks for your feedback.

  5. admin

    10 Apr 2014 Reply

    Hi,Francisco Mateu

    Thanks for your feedback.

  6. ErHonni

    10 Apr 2014 Reply

    thanks for sharing the circuit
    is there a simple way to make some changes to make the frequency adjustable?
    with a potentiometer or something?

  7. serunkuma shem

    15 Apr 2014 Reply

    grate work

  8. ali khani

    18 Apr 2014 Reply

    hi.sir thanks for inverter circuit.plz tell me another transistors if I don’t find irf540???

  9. Elijah

    13 May 2014 Reply

    I love your work,it is great though i have nov tried it. But is the wave a square or sine. Thanks. Elijah

  10. Elijah

    13 May 2014 Reply

    Sir,when i calculated the frequency using F= 1 / 0.693 * C * ( Ra + 2Rb ) ,where Ra = 4.7K , Rb = 120k and C = 0.1u , i got 58.97Hz instead of 50Hz. Please help me. Thanks

  11. Fikrul Hakim

    17 May 2014 Reply

    Hello sir.. Im trying to make this inverter using all the component listed in the above section, but i fail to produce th 220v ac.. I just want to ask.. Is there any unlisted component because when i look closer to ur circuit, there is a big black capacitor-like component. I hope u can explain about it.. Tq!

  12. sk sahabaj

    26 May 2014 Reply

    i am searching for a simple easy inverter circuit & i get this i am so intersted i will made it to day…

  13. sk sahabaj

    26 May 2014 Reply

    the transformer whish is using is a normal transformer 220v to 12v or not…

  14. sanjed arfin

    28 May 2014 Reply

    i tried to make it but my 555 burded out and brust ed why ??

  15. admin

    29 May 2014 Reply

    Hi, Sk sahabaj

    Thanks for feedback.
    Yes, your correct transformer.

  16. admin

    30 May 2014 Reply

    Hi,sanjed arfin

    I am sorry for your IC burded.

    You should check pin of IC-555 it may short or incorrect places.

    Thanks for you feed back.

  17. sanjed arfin

    30 May 2014 Reply

    c2 should be .01uf otherwise it will burn.

  18. admin

    6 Jun 2014 Reply

    Hi,Sanjed arfin.

    Thanks for feedback.

    C2 is 0.01uF to 0.1uF it not burned.

    I test really them.

  19. admin

    6 Jun 2014 Reply

    Hi,Mansoor

    Thanks for your feedback.

    This circuit works surely.

    as video is shown.

  20. admin

    6 Jun 2014 Reply

    Hi,ErHonni.

    Thanks for your feedback.

    Yes, you can use potentiometer for adjust output frequency.

  21. admin

    6 Jun 2014 Reply

    Hi,RK Chall.
    Thanks for your feedback.

  22. admin

    6 Jun 2014 Reply

    Hi,Mark.

    Thanks for your feedback.

    What about K-bridge?

    Please tell me.

  23. admin

    6 Jun 2014 Reply

    Hi,Francisco Mateu… My friend

    Thanks for your feedback.

  24. admin

    6 Jun 2014 Reply

    Hi,serunkuma shem

    Thanks for your feedback.

  25. admin

    6 Jun 2014 Reply

    Hi,Elijah

    Thanks for your feedback.

    The output is square wave at around 50HZ-60HZ
    You may use potentiomer for adjust frequency.

  26. sk sahabaj

    9 Jun 2014 Reply

    i can’t find irf540 please tell me the alternative of irf540..

  27. admin

    10 Jun 2014 Reply

    @sk sahabaj.
    IRF540 is N channel MOSFET that you can you any Mosfet which high current and voltage 33A 100V. I like it because very cheaper and easy to buy.

  28. v

    21 Jun 2014 Reply

    hi what can i do to increase the out put power to 200w

  29. admin

    22 Jun 2014 Reply

    Hi,V
    Thanks for your feedback.
    You can add Mosfet in parallel to increase current driver transformer which must change is 2 times current.

  30. v

    24 Jun 2014 Reply

    hi admin thank u very much for your replay ,can u tell me how to add mosfets in parallel

  31. momename

    24 Jun 2014 Reply

    Hi, V
    You can add mosfets in parallel for increase current drive secondary coil of transformer.

  32. vasudev

    25 Jun 2014 Reply

    do you think adding mosfets will increase the output power effectively

  33. momename

    25 Jun 2014 Reply

    Hi,vasudev
    For me if add mosfet in parallel it will increase current to higher.
    I should this mosfet because cheaper and easy to buy.

  34. vasudev

    25 Jun 2014 Reply

    hi momename
    can i use ne556 instead of ne555,because it is more efficient than ne555

  35. vasudev

    25 Jun 2014 Reply

    hi sorry it is not ne556 it is ne7555 which is cosmos ic

  36. momename

    26 Jun 2014 Reply

    @vasudev
    Yes you can use NE7555 same NE555.

  37. vasudev

    26 Jun 2014 Reply

    hi according to the power relation p=i*v ,where i is current & v is voltage
    but here if we use 12-ct-12v 2amps transformer we get only 24w of output how can we get 100watts of output power (p=2amp*12volts
    =24watts) ???

  38. momename

    27 Jun 2014 Reply

    @vasudev
    I do not very good any principles,But I love Electronic, If I test it works, I will tell you.

  39. momename

    28 Jun 2014 Reply

    > Hi good friends,i have a ups with 24v battery and wont to convert it to
    > inventer to power my 110v fridge thank you.
    >

    Hi, James Abeaku okine
    I not have a 12V to 110V inverter circuit example show you.
    If you have free time you may be test your ups circuit.
    and modify them.

    or you may remove the transformer.
    To adapt circuit into this circuit https://www.eleccircuit.com/220-volts-power-inverter-using-ne555-and-mosfet/

    But you must to use zener diode or IC7812 to reduce voltage of 24V battery to 12V to supply the IC555 only.

    I am sorry for circuit ideas (in image form) since now I take my family to weekend Holiday.

    Thanks

    Momename

  40. vasudev

    29 Jun 2014 Reply

    hi momename does the increase in gate current increases the output power

  41. Charles

    6 Jul 2014 Reply

    hello Admin,

    I have made d circuit and every thing is ok…but when i put the +ve terminal its sparks and flash the 220V 20W bulb while one of the mosfets becomes very very hot and starts smoking.

    Pls help ….thanks

  42. Charles

    6 Jul 2014 Reply

    In the picture on the website, you used an electrolytic capacitor…?

  43. momename

    6 Jul 2014 Reply

    Hi,vasudev
    You may increase current drive transformer with add mosfet next one in parallel.

  44. momename

    6 Jul 2014 Reply

    Hi,Charles.
    Thanks for your feedback.
    Please check connection of mosfet, they may wrong lead.

  46. ayman

    14 Jul 2014 Reply

    what will be the output if i connect 12v/ 70AH
    and i need ahelp for making an 1500W inverter

  47. saurabh

    18 Jul 2014 Reply

    please tall me meaning of ct

  48. saurabh

    19 Jul 2014 Reply

    Work but 60 watt bulb is very dim not full

  49. momename

    20 Jul 2014 Reply

    Hi,saurabh
    Thanks for your feedback.
    If you need full watt ouput.
    You must use 100W = 12V x I? transformer.
    or 8.3A input transformer.

  50. saurabh

    20 Jul 2014 Reply

    Using 3 capasitor and what diagram of third capasitor

  51. Mr.Surasak

    25 Jul 2014 Reply

    what will be the output if i connect 12v/ 70AH
    and i need ahelp for making an 1500W inverter

  52. Kingshuk

    27 Jul 2014 Reply

    When battery is connected bc549 getting hot no out put voltage solution pls.

  53. Kingshuk

    31 Jul 2014 Reply

    Hi momename, if iput more mosfet in parralal can it increase wattege my requerement is 800w

  54. momename

    31 Jul 2014 Reply

    Hi,saurabh
    The third capacitor is filter for low current battery.
    We not need put in the circuit.

  55. momename

    31 Jul 2014 Reply

    Hi,Mr.Surasak
    Thanks for visit.
    If you want fully power 1500w.
    You need to use 125A too current for me.
    and this circuit is square wave ouput.
    cannot use for motor load.

  56. momename

    31 Jul 2014 Reply

    Hi,Kingshuk
    Please BC549’s lead and the circuit again.
    Yes, If you connecte more mosfet in parrallel it can drive very many current load.

  57. Anjan Chatterjee

    1 Aug 2014 Reply

    Hi Momename
    If I connect the 8.3A transformer, then should I increase the no. of mosfet, or may I use the 8.3A 12V 100w transformer with the same circuit. Pls let me know ASAP..

  58. momename

    1 Aug 2014 Reply

    Hi,Anjan Chatterjee
    Thanks for visit.
    Ideally, the mosfet can drive 27A maximum.
    But we may connect them in parallel x4 pcs.
    Normal current each mosfet is 2A so easy to drive load.

    If this project work please send your photo to me.

  59. Anjan Chatterjee

    1 Aug 2014 Reply

    Thanks for your kind feedback Momename. I actually want to use this circuit as a travelling battery charger(phone, dslr)where I connect solar panel (12V, 70-80watt) as source. I will connect the battery charger as load, I think the charger don’t get to much watt. So I think I easily use this circuit. **Pls correct me If I am wrong..
    Thanks..
    *should I send My photo or the mentioned project photo ?

  61. Anjan Chatterjee

    2 Aug 2014 Reply

    Hi momename
    Thanks for your feedback..I previously checked that project. But I don’t want to carry the battery. I thought I simply connect the 12v 7-8ah solar panel directly with your this circuit(source). If I do so then will the circuit work ? I dont need power at night.
    Thanks A lot for helping me…

  62. Anjan Chatterjee

    4 Aug 2014 Reply

    Hi In your circuit diagram you mention Two +12 volt Dc Terminal/Point. But In your Figure 2 You put Providing +12 Volt Dc Only one Point. Can You Pls Tell Me Is The Diagram Right ? Should I provide +12 in both terminal or should I Provide +12V in one & another with -12V. And Pls also mention the points where I have to provide The +/-12 Volt in the circuit.
    waiting for your reply..
    Thanks..

  63. Saikat

    10 Aug 2014 Reply

    In place of bc549 transistor can I use bc547 ???

  64. momename

    10 Aug 2014 Reply

    Hi,Salkat
    Yes,you can use it BC547 same BC549 or similar: BC550,BC546, etc.

  65. momename

    10 Aug 2014 Reply

    Hi,Anjan Chatterjee
    In Figure circuit diagram.
    All ground is (-12V terminal)
    All +12V are joint together = +12V.

  66. saikat

    11 Aug 2014 Reply

    If i use 8 amp of transformer then i have to use 2 pair of mosfet?
    how many power i will get after doing this…
    Pls ans me as soon as possible,,,,…….

  67. saikat

    11 Aug 2014 Reply

    And through this circuit can i run a motor of 80 watt?

  68. prits

    19 Aug 2014 Reply

    is it okay. If i use power bjts tip122 in place of mosfets.. Will the output varry?

  70. chayapon

    19 Aug 2014 Reply

    Hi,prits
    Thanks for your feedback.
    If you ue transistor, you should too many transistors.
    In this case you may use darington transistors.

  71. Santanu Dey

    20 Aug 2014 Reply

    Dear Sir,
    I have build this circuit and it works absolutely fine. Kindly suggest me a battery charger circuit which i could use with this circuit and if possible suggest me how to convert this square wave inverter to a sine wave inverter.

    Regards,
    Santanu Dey

  72. Ramkrushna Kaduri

    20 Aug 2014 Reply

    Very simple Example of inverter working principle, thank you so much sir. small doubt sir instead of single transformer can we use 2 transformers in series? please rectify my doubt

  73. momename

    20 Aug 2014 Reply

    Hi,Santanu Dey
    Thanks for your feedback.
    Now I not have how to convert square wave to sine wave.
    When I have it will fast post to you.

  74. Santanu Dey

    20 Aug 2014 Reply

    Dear Sir,
    Thanks for your reply. Could you suggest me a battery (12v/7.2AH) charger circuit which I could use along with this inverter circuit.

    Regards,
    Santanu Dey

  75. mash

    25 Aug 2014 Reply

    hi all,if i use a 50Amps transformer will the circuit still work fine,P=IV so 500W=I x 12v which gives 50Amps & also what if i use pair of transformers in series.

  76. mohammadreza

    26 Aug 2014 Reply

    Dear Sir,
    Could you tell me if I want use that 470uf electrolytic capacitor, where should I place that in diagram?
    Could you send me the new diagram with that capacitor or your PCB and schematic files?
    Regards,

  77. Abdu Karim

    29 Aug 2014 Reply

    Hi sir, am asking why is Q2 very hot and Q3 very cold and vey low output of 30V.

  78. Taofiki I Akinleye

    8 Sep 2014 Reply

    Thanks for your display and article.pls do you have avenue on seminal or training for any intrested person

  79. chayapon

    8 Sep 2014 Reply

    Hi,Taofiki I Akinleye
    Thanks for your feedback.

  80. mhafe

    27 Sep 2014 Reply

    Why is not working I use MOSFET irf3710

  81. mhafe

    27 Sep 2014 Reply

    Can I use a power supply as my input?but why my voltage source breakdown to 6 volt

  82. mhafe

    27 Sep 2014 Reply

    Hi admin..why may Q2 has no out voltage while the Q3 has output voltage of 12v

  83. siva

    28 Sep 2014 Reply

    sir…wt s the cost of 12 volt battery and the cost of transformer……thankyou

  84. momename

    5 Oct 2014 Reply

    Hi, mhafe
    Thanks for feedback.
    This circuit used for 12v battery.
    Q1 make volage different 180 degree.
    To drive transformer.

  86. joremie

    9 Oct 2014 Reply

    hi sir can i use irfz44n instead of irf540?

  87. momename

    9 Oct 2014 Reply

    Hi, joremie
    Thanks for your feedback.
    Yes, it can be use if n types.

  88. joremie

    14 Oct 2014 Reply

    thanks for your reply sir., sir do you have a diagram of a pure sine wave inverter?

  89. papay

    29 Oct 2014 Reply

    Can I use 24v as a battery voltage in this circuit?? Please response first I’m on it .

  90. Samar

    9 Nov 2014 Reply

    i have make this circuit. but this circuit is not working probably. the main problem is that ic only gives the positive voltage and does not give ground so can you plz solve the problem. what is the problem with pin 3 or ic? plz reply i am waiting for your reply.

  91. Elvedin

    19 Nov 2014 Reply

    Hi, did you check how much efficient is this circuit how much watts draws at primary winding and how much provides at secondary winding

  92. Leon

    4 Jan 2015 Reply

    470mf where he would have to be connected resistors 0.5W

  93. Elijah

    6 Jan 2015 Reply

    Sir,thanks for the circuit. I want to know the advantage of a sine wave over a square wave inverter. Please help me. Elijah

  94. Rohit

    9 Jan 2015 Reply

    Sir you dont mention the connection of heat sink in your ckt diagram
    How can i connect it

  95. UMAR Bello

    17 Jan 2015 Reply

    iam very happy with this, but sir the two types of the inverters i make them no any problem but sir they can’t take RED Globe.plc sir can we start communicating in other to help me with some or many ideas thanks so much (+2347064396921)

  96. akshay

    9 Feb 2015 Reply

    sir you dont mension the capacitor at the battery terminal side and it is very important one ,so i got the output correctly .

  97. Baltuodis

    16 Feb 2015 Reply

    Dies ist eine wirklich interessante Schaltung. Sie sollten diese zum PATENT anmelden. Der Wirkungsgrad von mehr als 400 Prozent ist wirklich bemerkenswert. ‘The transformer I use 2A current and 12V input at output power more than 100 watts.’
    Erreichen Sie diesen hohen Wirkungsgrad durch die unsymmetrische Ansteuerung des Transformators?
    Ich habe da einen Vorschlag für Sie. Erzeugen Sie aus den 220V wieder die 12V Speisespannung. Sie haben dann noch genug Energie über, die Sie weiter verwenden können. Gehen Sie aber sicher, daß Sie alle überschüssige Energie entnehmen. Ansonsten könnte ihnen die Schaltung aufgrund des Energieüberschusses explodieren.
    Viel Spaß, Baltuodis.

  98. suleiman

    23 Feb 2015 Reply

    Plz sir i want to construct a 1000watt 12VDC-220VAC inverter, (normal and fast) charging plus mosfet and circuit all on P.C.B Module i nid ur help

  99. kale

    24 Feb 2015 Reply

    Dear You did it I will try

  100. Andrey

    24 Feb 2015 Reply

    VERY high losses in mosfet`s and poor efficiency!

  101. michael

    12 Mar 2015 Reply

    how sure is this circuit because i have build some many circuit from the internet not 1 worked.so pl’s will this circuit work?

  102. aditya

    23 Mar 2015 Reply

    is the transformer used a normal 230v to 12-0-12 connected as reverse or is this a special step up transformer?

  103. keya Ghosh

    4 May 2015 Reply

    hi
    at first thanks for this simple circuit.bt i have a problem.from this circuit i get square wave form.bt output voltage is very small,in mv.please give me a proper solution.it is very urgent.

  104. ifran

    18 May 2015 Reply

    i made this, but it isn’t working. their is no drain voltage. what is the problem. plz let me know.

  105. deep singh

    29 May 2015 Reply

    respected sir
    how to cheack mosfet and fet ?what is3171 in ups

    1. mrohm1970

      22 Jan 2020 Reply

      great project thanks

  106. bhadar singh

    31 May 2015 Reply

    i want to know output and working of each component.hw dc is converting into ac,hw mosfet works.wt output thy give..coplete function of each components along wid output

  108. Sk sahabaj

    31 May 2015 Reply

    Hi I want to build a inverter few year ago but i can’t find a easy to build circuit.But now i find this assome circuit.Now i can build this.
    Thanks for the project.

  109. taiye awe

    6 Jun 2015 Reply

    pls sir, your circuit worked well but I discovered that when I added more load, d voltage decreased. how can we make up for this pls? I believe if we can initiate a feedback unit, it will solve this problem. so where and how do we apply the feedback pls? work on this because its necessary sir.

  110. sunny

    17 Jun 2015 Reply

    pls sir I want to construct a 12v inverter, u need a circuit diagram

  111. sunny

    17 Jun 2015 Reply

    pls sir I want to construct a 12v inverter, i need
    a circuit diagram

  112. Allah dita

    2 Jul 2015 Reply

    I want to build up a 220 volt dc to 220 volt ac inverter

  113. mohsin khan

    21 Jul 2015 Reply

    Sir, which is transformer is used in this project step up or step downh . please tell me

  114. sandesh

    26 Jul 2015 Reply

    this circuit is very good. i tried it …it works good but very less efficiency..
    q2 is very hot but q3 is very cool…may i know the reason please…i have used 3 amp 12-0-12 transformer.
    tq

  115. khaled

    5 Sep 2015 Reply

    He said possible draw or sketch Print

  116. Rikchard

    8 Sep 2015 Reply

    i love this site.more power to your elbow

  117. hammed

    13 Sep 2015 Reply

    Hi sir, i saw ur project as simple and I feel in love with it,so I decided to practicalise it.I used IRF2807 instead of IRF540N and BC547 instead of BC549 bt the bulb jst light on for a few seconds n went off.since then I’ve been troubleshooting it bt cnt find where the problem lies.pls cn u help me with a solution ASAP.I really need it

  118. Daniil Krumct

    3 Oct 2015 Reply

    Hi sir,can I use 30amp as power mosfet such as FDB7030BL or CEP7060R?

  119. ud

    17 Oct 2015 Reply

    Sir can do a video of this on a breadboard (temp white board) because i ve tried the circuit it didn’t work i need ur coaching

  120. vuanhtu

    29 Nov 2015 Reply

    love your work ! can you send me your wiring layout to [email protected] ! always here to support your product !

  122. Adarsh

    12 Dec 2015 Reply

    Can i use this square wave inverter to charge my phone..??

  123. adarsh

    19 Dec 2015 Reply

    got 200v o/p only 🙁 how to make 230v o/p

  125. Vidyasagar Mandal

    18 Jan 2016 Reply

    Why used BC549 transistor

  126. momename

    18 Jan 2016 Reply

    Hi Vidyasagar Mandal,
    Thanks for your feedback.
    The BC549 is cheap and easy to buy.

  127. momename

    18 Jan 2016 Reply

    Hi adarsh,
    Thanks for you question.
    You may try to use a transformer; 9V to 10V for input and 230V output.

  128. Vidyasagar Mandal

    18 Jan 2016 Reply

    IC 555 Timer Calculator with formulas & Equations IC 555 Timer Calculator with formulas & Equations IC 555 Timer Calculator with formulas & Equations

    Formulas and Equations for This calculator

    Frequency (f) = 1/ [ ln(2) x C x (R1 + 2R2) ]

    Frequency (f) = 1.44 / C x (R1 + 2R2) …. Where… 1/ ln(2) = 1.44

    This formula putting and get 58.9hz frequency in output 3no. pin on 555 ic why this inverter out frequency 50 hz

  129. suresh

    4 Feb 2016 Reply

    AWESOME!!!

  130. Akhras

    12 Feb 2016 Reply

    I made it but it gives me low voltage 40V AC

  131. Santdev Yadav

    18 Apr 2016 Reply

    I made this circuit …but the output from the MOSFETs have only one output at a time ..Both MOSFETs don’t get ON simultaneously …What to do ..I have used BC 547 in place of BC 549

  132. pankaj bhagchandani

    6 May 2016 Reply

    My circuit is working but the only problem is that when i reomove and again give ground then bulb blinks but it doesnt remained ON … what can i do? please help asap!

  133. reynaldo fontamillas

    3 Jun 2016 Reply

    so very high tech the inverter by MOSFET perform the working 12dc to 230 ac

  135. Dharmielolah

    17 Jul 2016 Reply

    Am still arranging d cct together I will get back to u

  136. Dharmielolah

    19 Jul 2016 Reply

    I use bc547 but I notice it’s only one get switch but d other fet is off d volt frm 5.6k didn’t feed the 547 pls what should u do thanks

  138. Opu

    3 Oct 2016 Reply

    Thise circuit is’t work. Real time simulation faild to start

  139. ashutosh

    10 Oct 2016 Reply

    in the image of this project there is a capacitor but it is not mentioned in its circuit diagram. why?

  140. Eisen

    22 Oct 2016 Reply

    I already build the ckt the problem is the other mosfet is heating…and the output is onl 50volts AC

  141. Eisen

    22 Oct 2016 Reply

    Can you help me…what is the problem?

  142. pankaj bhagchandani

    29 Oct 2016 Reply

    finally!! After so long it worked. hey guys, one extra capacitor(470uf, 50v) is used in the circuit is important. it is used as a filter and you can connect its negative and positive through the dc supply’s -ve and +ve respectively.

    NOTE: It do not required, if you use 12V battery 10Ah because it is stable power current source.

  143. ashutosh

    4 Nov 2016 Reply

    i made the circuit properly as mentioned ,every components are of equal as given value but it is not generating 220v and transformer is heating very much .what to do please help me??

  144. ashutosh

    4 Nov 2016 Reply

    i made this circuit everything is placed correctly of right value but the circuit is not generating 220v ac and the transfermer also get heated very much.please help!!

  145. Mohit Vishwakarma

    8 Dec 2016 Reply

    If i want use 40 volts dc voltage as input voltage then what is the rating of all components like resister, capacitor etc….
    Plz rpy me immediately…..

  146. Zala

    10 Dec 2016 Reply

    It’s work good with 750ma transformer when I connect 5A 12_0_12 v transformer the ic ne555 was heat much and burn

  147. ashok

    10 Jan 2017 Reply

    Can i use 3A 12v-0-12v transfomer for dis circuit

  148. KUBENDHRAN A/L MUNESWARAN

    24 Mar 2017 Reply

    Hi bro, I like the concept you use to design circuit. I fabricate the same circuit with the same spec of all the component as you used but instead of using 12-0-12 2A transformer, I choose to use 12-0-12 4A transformer. In software simulation, I have tried using Multisim and Proteus. Sorry to say the simulation was failed. The result in real time hardware fabrication is a positive. I manage to light up a bulb but the waveform generate from oscilloscope is clamping not a square wave. The light which lights up keeps flicker. I used 12v 7.2AH battery. Did you manage to simulate this circuit in software? If so, please reply me. Thank you.

  149. pankaj mahanta

    30 Apr 2017 Reply

    Please help.
    Tell me the diagram that has 470 capacitor connections. My voltage is 100 volts. The first one is the project. I am weiting your ancestor … Please help.

  150. marvin lunag

    1 May 2017 Reply

    what should be substitue to bc 549

  151. marvin lunag

    1 May 2017 Reply

    pls help.
    what should be substitue to bc 549

  152. marvin lunag

    1 May 2017 Reply

    pls help.
    what should be substitute to bc 549 because that transistor is not availble in my place.

  153. amirhosein

    5 May 2017 Reply

    hi
    aim amirhosein from iran,tehran
    tanks your website
    its very very good
    tanks

  154. sam

    24 May 2017 Reply

    I connected the circuit as illustrated but whenever i connect it to the battery which is 12V 7Ah, the wires heat up and burn and no output from transformer. Please help

  155. Aerk

    7 Oct 2017 Reply

    You project and website are very good and benefit for Electronic working.

  158. MF4Me

    19 Jan 2020 Reply

    Dude, either your cap is way out of tolerance or your math is off. A 4.7K resistor for R1 results in 58.97 Hz by calculation. If peeps are putting 60 Hz into a 50 Hz transformer, they’ll have problems.

    1. ElecCircuit.com

      20 Jan 2020 Reply

      Hi MF4Me,
      Thank for your feedback. You are correct.
      We can change R2 too. To set output is 50Hz.

      1. MF4Me

        21 Jan 2020 Reply

        YW. By calculation (results will vary depending on component tolerances) a good combo of common parts would be 0.2 uf (2 x 0.1 in parallel), 100 Ohm for R1 and 72K (39K and 33K in series) for R2. That calculates to 50.069 Hz with a 50.03 duty cycle. That’s smart bomb accuracy if your tolerances work out. Otherwise that should get folks close enough.

        1. Apichet Garaipoom

          21 Jan 2020 Reply

          Wow! that’s nice. You are great.
          Your design and calculations are excellent.
          Thank you very much. It is will definitely benefit everyone.

  159. Rahul

    26 Jan 2020 Reply

    Kya ya battery ko charge bhi KR sakta hai

  160. Emmanuel

    2 May 2020 Reply

    Can it work with a non-centre tap transformer

  161. Naleen

    9 Jun 2020 Reply

    Hi,
    Can i use sw50n06 instead of irf540 ?
    i tried, but it’s getting heated unexpectedly.

    1. Apichet Garaipoom

      28 Jun 2020 Reply

      Hi,
      Yes, you can I just read datasheet of SW50N06: on TO-220
      FeaturesN-Channel MOSFETBVDSS (Minimum)RDS(ON) (Maximum)IDQg (Typical)PD (@TC=25 ): 60 V: 0.023ohm: 50 A: 30 nc: 130 W

      You may try it. Please cheack leg it again. I sure you can do it.

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