100w Inverter circuit 12V to 220V using Transistor

You can read books under at night under a light. Energy from AC main makes it happen. But if you do not have an AC voltage. Do You still use a light? You need to use a 100W inverter circuit and battery.

Also, If you are outside a house, no electricity. You cannot use a lamp with a 12V battery.

This circuit is a mini inverter circuit using power transistor 2N3055 as main components.

It is designed for you that need to use appliances at outdoor or no electricity.  Someone use it in a car or the high mountain etc.

It can be converted 12VDC to 220VAC.  The maximum output power about 100 watts.  It is suitable for normal lighting (all home lamps), also used for radio, Mini TV, Stereo.

Someone uses it for a small soldering iron to repair or build many projects outdoor home.

How it works

100 watts inverter circuit 12v-to-220v using transistors

Figure 1, Circuit diagram of Inverter 12V to 220V 100W using transistors

Figure 1 is a schematic diagram. This circuit will include four main sections.
1. Q1 and  Q2 act as the frequency oscillator circuit.
2. Q3 and  Q4 act as the frequency divider circuit
3. Q5 and Q6 act as the driver circuit.
4. Q7 and Q8 act as the output circuit.

Let’s look at to both transistors Q1,Q2 will be connected together as the astable multivibrator form. It will generate the output frequency about 100 Hz at the collector lead of Q2. Then this signal will sent to the two frequency divider makes the frequency is reduced down about 50Hz

Cause we don’t design the circuit to directly work at 50 Hz. Because the generating the steady low frequency is very hard.

The output from divider circuit is sent to base of Q5,Q6. To increase current up to drive the output transistors Q7,Q8, then drive the transformer, finally to supply load.
1. Normally, use the 2-3A transformers for 20-30watt for the incandescent lamp. But use need 100watt use must use 8A transformer so expensive for me.

2. The primary coil of transformer use may use 9V CT 9V or 10V ct 10V or 12V ct 12V.

Which normal I use 12V ct 12V makes the output voltage about AC 220V (no load). But there is load voltage will reduce to AC190V

3.This circuit will has output as square wave form. So cannot use for inductor load.

4. This transformer, we may use secondary coil is the output voltage as you need, example we connects to the power amplifier that use AC 24 volts so we use AC 24V secondary coil etc.

How to builds

It is like all our projects. To begin with make the PCB or you can use the universal PCB. Then, assemble all part on PCB as Figure 2. Next check all for error. Check again and check again.

Then apply the 12V 10A battery to this circuit and use the voltmeter to measure AC voltage output. Next connects load to the circuit.

Figure 2 PCB layout and components layouts of the 100 Watts Inverter, 12V to 220V by Transistors

Parts you will need

Q1-Q4: BC557, 45V 100mA PNP Transistor
Q5, Q6: BD139, 80V 1.5A NPN Transistor
Q7, Q8: 2N3055, 100V, 15A, 115W, >2,5MHz NPN transistor
D1, D2, D3, D4: 1N4148, 75V 150mA Diodes
D5, D6: 1N4007, 1000V 1A Diodes

0.5W Resistors tolerance: 5%
R1, R4, R6, R7: 10K
R2, R3: 150K
R5, R6: 47K
R9, R12: 220 ohms
R10, R13: 560 ohms
R11, R14: 100K
R17, R18: 150 ohms
R15, R16: 10 ohms, 10W Resistors tolerance: 5%

Ceramic capacitors
C1,C2: 0.047uF 50V
C3,C4: 0.01uF 50V
C5: 1uF 50V
C6: 0.1uF 250V
C7: 0.1uF 50V
C8: 220uF 25V, Electrolytic capacitors
T1: 230V AC primary to 12V-0-12V,2-8A secondary transformer.


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This Post Has 84 Comments

  1. This projets are so much helpfull

  2. i want make a ups for only one electric fan please help me about this

  3. i try to build this inverter but did not work. the one transistor 2n3055 is hot. please any body help me to work this circuit.

  4. Is there any probs when we built this circuit in a breadboard……please help me

  5. i have done everything but is not working. When i connect the power (battery 12v) is not giving any output at all.And am worry bcos that is my project and am working on it but still is not working so i want u to help me

  6. It’s information very helpful me in my project”INVERTER USING SOLAR ENERGY” .

  7. I want to make a 50 watts DC 12V to AC 120V inverter
    So please help me.

  8. I want to know about the cost of 6v, 8v and 12v w inverter circuit. pls help.

    FOR A 500 WATT INVERTER—-12VDC—-220V AC?

  10. What type of transformer and of which rating should be used????

  11. hi
    I want to build a system that charging lithium batteries

  12. its funny it works perfectly i tried it up todate its still working

  13. its funny it works perfectly i tried it, up todate its still working

  14. i needs a 500w inverter circuit any one can help me

  15. i want to know the components i can use to build a 12v 7Ah 220v inverter 50w.please the ratings of resistors …not more than two transistor

  16. pls l want the size of compunents that could be used to build an inverter that could power 100 wailt bulb.

  17. which type of transformer you used is this a current transformer or simple center tapped transformer plz help me I want to build this circuit

  18. thank you sir, it is agood idea.ihave worked it out for two years but still working.even i have improved it to 500W and beyond. God bless you.

  19. i need help to build 5000 wait inverter circuilt.

  20. hai sir i have mini inverter two lights and use TIP3055 and 2N3055 and more plese help me

  21. Hi,Arun
    Thanks for your feedback.
    Yes you can use TIP3055 transistor it is power transistor. I would like to use it. because easy to mount but it expensive than 2N3055.

  22. Plz give how many ampr is required at input side in 12v dc battery?
    12v dc but amp_?
    and also tell me about the transformer rating, voltage_ and amp_?

  23. Hi,Brijesh
    Thanks for your feedback.
    I used Car battery 12V 40Ah. and transformer 2A-3A.
    I can use for laptop and 20w lamps.

  24. simpley and nice projects i hink i is used home applyencants

  25. Hello
    Site is very useful
    I love some of the questions LaSalle
    I would love to Create symbol such as this therefore sent this letter to you this Model
    Micro Inverter using TIP41 or 2N6121 Eleccircuit_com.mht
    I do not want to stochastic problems during the building and district corect me because I am beginner in electronics and components diffrant from one country to another and often for name
    But I’ve found a wire size of 20 within the components and district did not understand his place in the circle
    Is if it is used Transforma strongly 500 watts and district will bear you are working or collapse /
    Ask a circle called xenon raise electricity for the car battery front bulbs for cars and light color makes the car think the white circle enlarge Volt
    I hope for your reply and help me
    Thank you

    Sorry for the poor quality of language translation and Google is also not good

  26. hi

    i Ask about Circuit called xenon raise electricity for the car battery front bulbs for cars and light color makes the car think the white circle enlarge Volt
    [email protected]

  27. hi
    ineed inverter like this
    web adress is arabtronics.net/products/INVERTER-KIT-W%7B47%7DT-12V-24V-220V-750W.html

    [email protected]

  28. hi 4 all
    momename thannks
    Thanks so much for the founder of the site, which allowed us to posts and thanks also to his esteemed visitors
    Ask the electronic circuit for xenon used in lighting the front of the car and gives a strong white light searched the forums English and found them talking about circles xenon flash any light intermittent and disco parties please help me with knives circles components electronic large-sized conventional and not system components printed and does not Electronics Small Size
    Thank you
    And you greetings
    [email protected]

  29. hi

    This line did not understand it the last line in the electronic components to build this circuit easy inverter

    solid Wires no. 20 AWG length 1 feet, for what iam not understand is it for main connector or???please help me

    [email protected]

  30. mome.name

    What is the reason that in the absence of even one letter omitted patient Xue

    ما سبب الغياب ما في حتى رساله واحده بيها اصبر شويه ما الوعد بيناتنا الفه اغنيه سودانيه مهداه لحصرتك

  31. mome.name

    What is the reason that in the absence of even one letter omitted patient Xue

    المهندس الغالي
    ان كنت تتكلم العربيع يجب ان نتخاطب بالعربيه في رسائلنا القادمات واشكر رحابة وسعة صدرك وكرمك الفياض

    ما سبب الغياب ما في حتى رساله واحده بيها اصبر شويه ما الوعد بيناتنا الفه اغنيه سودانيه مهداه لحصرتك

  32. hi

    who is inverter can run fans and motors sny inverter or none


  33. Hi,Moha
    This circuit cannot be used for AC fans or AC motor because it is square wave inverter.

    I am sorry now not have sine wave inverter.

    Thanks for visit.

  34. hello its prits again.. i want to know about the cost of total circuit..

  35. Can you please give me the list of all components……….and how many amps of transformer and battery you are using…..plz

  36. sir!
    i want to apply this idea in my final year project please send me more detail about Inverter 12V to 220V 100W by Transistor.
    i want to submit proposal on this topic for my final year project

  37. Hi, prits
    Thanks for your feedback.
    Please look at text above again.

  38. Hi, Sam
    Thanks for your feedback.
    Now I add the parts list, please look at text above again.

  39. Hi, tahir
    Thanks for your feedback.
    Please read again.

  40. Hey needed circuit diagram on how to make mppt solar controller regards

  41. Hi, simon
    Thanks for your feedback.
    Now I not have the high power controller.
    But sometimes you may idea from simple circuit look athttps://www.eleccircuit.com/category/battery-charger/solar-cell/

  42. total spend on this above cited project

  43. thanks for give us this information.

  44. Is that Inverter 12V to 220V 100W by Transistor will work properly………….?

  45. 12ct12/230v what is 12ct12

  46. Hi amol,
    Thanks for your feedback.
    Please look at T1___230V AC primary to 12V-0-12V,2-8A secondary transformer.
    CT = center trap

  47. Very good.

  48. I want to apply this idea in my final year project please send me more detail like abstract and applications about Inverter 12V to 220V 100W by Transistor.

  49. Can 2n3773 work

  50. Can I use 12v 7A battery for this project?

  51. I Tried this circuit.But its not working.The 10ohm resistors are burning when supply is given.
    help plzz

  52. when i done this circuit on breadboard both the 10ohm resistors got burned. please help me…

  53. Hi arun,
    Thanks for feedbacks.
    Please check circuit for error again.
    and Check polarity of both diode at power transistors.

  54. I don’t have transistor BC139 and resistor 10ohm 10 watt what other transistor and resistor can I use instead of that transistor and resistor ?

  55. Is it BC139 Transistor or BD139?
    Because in the figure it is BD139 but you wrote in part list Q5,Q6 BC139

  56. Hi, Saud
    Thanks for your feedback.
    I’m sorry for error in list Q5,Q6 = BD139

  57. What other value of resistor 10ohm 10 watt can I used because i didn’t find 10ohm 10 watt?

  58. sir im getting 12v at input side of transformer before conectng transformer… bt wen i connect transformer voltage become 6v and im getting nly 110v output from transformer. please help me. im using 12-0-12 to 230v ,3amp transformer.

  59. The mistake was mine.There were error in connections.But another problem now is i cant simulate it in protus with some load connected to it.
    can someone help please

  60. use full

  61. I just wanna design a 1000watts pure sine wave inverter can u assist me knw the suitable ratings of the transform I am to use in my design otherwise assist me


    12v 7Ah /
    12v 2AH
    converte kar sa te hey

  63. All about was good but I need a 100 watt output inverter to use as input power for operate a 1000watt inverter with full load. Give me a giagram for the same.

  64. plz help me for making my miner project I don’t decided which project we make

  65. Hi friends
    I have one doubt about inverter. Many of circuits are available via net but lot of circuits output power is not given. So my question is how to calculate output power of inverter.

  66. I am trying connect the circuit in PCB what am supposed to use for the transformer and center tap and how can I connect it will be help full if you guide me as soon as possible . If you build this circuit in pspice that will be great .
    -thank you.

  67. This is not giving any output

  68. What device can be at source 12 volt and 10 A

  69. One 10 ohm resistor is getting hot but another one is not. Frequency divider circuit’s 2 output’s are different voltages. I checked my connection and element’s values. There is no error. Then I don’t understand what’s wrong. Reply please

  70. by changing battery (i.e…10amps-45 amps).can wattage be increased

  71. when i connect 12 volts to circuit . battery voltage decreasing to 6v and output is 6v-0-6v.plz help me.remaining things are perfect

  72. Sir , where we can get the specified boards to suitable to your circuits of battery charger, home inverters?

  73. how can I make dc to dc regular mini inverter..exemple..6volt to 12volt…please sir teach me..

  74. sir…its so need to know me….is this possible 6volt dc to 12 volt dc..inverter?. please if you tell me and give me the diagram….I want make it…

  75. i want to repair the power supply that convert from 220vac to 24vdc.it is cut off .

  76. When ibobserve the picture i do not undetstand that a line in somewhere is it touch or not touch

  77. Hai, can u please give me a solution for my question it is that how to produce 7amps current as an output by giving dc voltage as an input to the circuit , one important thing is that without using transformer please help me guys.

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