Inverter 12V to 220V 100W by Transistor

This circuit is 100 watt power inverter using power transistor 2N3055. It is designed for you that need to use appliances at outdoor or no electrical places. Someone use it in car or the high mountain etc.

The maximum output power of this circuit about 100 watts, it is suitable for a normal lighting (all home lamps), also used for radio, mini TV, stereo or someone use it for
How it works
From the schematic diagram in Figure 1 this circuit will include of 4 main section are:
1. The transistors Q1,Q2 act as the frequency oscillator circuit.
2. Both transistors Q3,Q4 act as the frequency divider circuit
3. The Q5,Q6 act as the driver circuit.
4. The Q7,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 1 Circuit diagram of Inverter 12V to 220V 100W by Transistor

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
R1,R4,R6,R7_________10K___1/2W Resistors tolerance: 5%
R2,R3___________150K______1/2W Resistors tolerance: 5%
R5,R6___________ 47K______1/2W Resistors tolerance: 5%
R9,R12__________ 220 ohms 1/2W Resistors tolerance: 5%
R10,R13_________ 560 ohms 1/2W Resistors tolerance: 5%
R11, R14________ 100K ____1/2W Resistors tolerance: 5%
R15, R16________ 10 ohms__10W Resistors tolerance: 5%
R17, R18________ 150 ohms_1/2W Resistors tolerance: 5%
C1,C2___________0.047uF 50V_____Ceramic capacitors
C3,C4__________0.01uF 50V____Ceramic capacitors
C5______________1uF 50V_____ Ceramic capacitors
C6_____________0.1uF 250V____ Ceramic capacitors
C7_____________0.1uF 50V_____ Ceramic capacitors
C8____________220uF 25V_______ Electrolytic capacitors
T1___230V AC primary to 12V-0-12V,2-8A secondary transformer.

68 thoughts on “Inverter 12V to 220V 100W by Transistor”

  1. 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.

  2. 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

  3. 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

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

  5. 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

  6. 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.

  7. 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.

  8. 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_?

  9. 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

  10. 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

  11. 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


    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


    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

  14. 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.

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

  16. 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

  17. Hi, simon
    Thanks for your feedback.
    Now I not have the high power controller.
    But sometimes you may idea from simple circuit look at

  18. 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.

  19. 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 ?

  20. 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.

  21. 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

  22. 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

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