# 555 timer IC Inverter circuit schematic 12V to 220V

This article explains What is inverter? And how can you construct your own simple low cost 12V to 220V inverter circuit. An inverter is nothing but a DC to AC converter. Inverters are very useful electronics products for compensating emergency power failure, as it performs DC to AC conversion.

AC can’t be stored for future use but DC can be stored for future use in a battery. The stored DC can be converted back to AC by using power inverters.
Here is the simple inverter circuit diagram using 555 timer IC. The astable multivibrator mode operation of 555 timer utilized here for AC oscillations and these oscillations are switched via transistor 2SC4029 to a transformer. The transformer step ups the voltage to 220V AC. Use a 12V battery and Battery charger circuit for this project. Design of inverter circuit is also given.

## Components required

1. Power supply (12V)
2. Resistors (3kΩ x 2; 1kΩ, 2W x 1)
3. Capacitor (10µF)
4. 555 timer IC
5. Diode(1N4007)
6. Transistor (2SC4029)
7. 9V to 220V Step up transformer

## Working of DC to AC inverter

• This is a simple inverter circuit based on 555 timer IC. Here timer IC wired as an astable multivibrator mode.
• The diode 1N4007 is used to get 50% duty cycle for the pulses from 555, it also reduces the design complexity.
• The output pulse from the 555 astable multivibrator is fed to the base of power transistor 2N5192. The 2N5192 transistor works as a switch, so the 12V DC supply passed through the transformer at a rate of 50 times per second.
• Transformer step up the 12V to 220V, thus we got 50Hz, 220VAC supply at the output of transformer secondary.

## Design of Inverter circuit

555 timer Astable designed about to oscillate at 50Hz, line frequency.
Frequency of astable multivibrator is given by,

Choose C=10µF, then

Use R1=R=3kΩ

## 93 thoughts on “555 timer IC Inverter circuit schematic 12V to 220V”

1. Anonymous says:

output power? 5w, 10w 75w, 100w…? what kind of stuff can i plug into this inverter? what about computer charger (70w) so that i can use laptop in car? thanks

2. Anonymous says:

Upto how many watt of load i can drive by this inverter

• wael says:

can I use car battery ??

• Yaseen says:

Hi wael
You can use car battery.

3. Anonymous says:

hi, can we replace transistor 2sc4029 with n-channel mosfet like irf830b or irf3205 this way: base=gate, collector=drain, emitter=source? thanks

• Hi,
Of course you can change the transistor with power mosfets

• Omoniyi says:

I need the real leg of transistor,base,common,emmiter

4. is that a step up transformer? connected to dc voltage 12V? is that possible sir?

• Hi Kevinjohn,
Yes it is a step up transformer. Positive is connected to 12V Vcc to collector of transistor. Transistor is switched by astable, so output will be AC.

5. Sir can u explain connection of trnsformer

• Hi JD
Primary(low resistance coil) of the transformer is connected to collector of the transistor. Output is taken from the secondary.

6. Sir can i use 12v 1 amp transformer
How much power i will get
Can i test it with cfl

sir 2sc4049 is not available in market. can i use any other transistor if yes then which typr?

7. habibi says:

Salut!
I have a Integrated Circuits (MP10072ES) and i need to get timer…

8. Akin Olufemi says:

If a pure sine wave is fed into the base of the transformer instead of a square wave, will the output be a pure sine wave?

• Jaseem vp says:

Hi Akin Olufemi,
As we know a transistor can work as both an Amplifier and as a Switch. Square wave used while dealing with transistor switch (common in Digital electronics) where as Sine wave need proper biasing and Q point for amplification. Amplifier will give pure sine wave.

9. dinesh says:

hi sir what is advantages of this circuit ?

• Khaleel says:

Low cost and availability of components.

10. DINESH says:

hir sir we can use transister 2sc4029 with advance power mosfet irf530?

11. DINESH says:

12. ayyappa says:

sir transformer is step up or step down use in this circuit

• Yaseen says:

Hi Ayyappa
You can use step up or step down but, you should connect revers when you are using step down.

13. Smita says:

I had 3.3 volts output in my circuit. I want to convert it to AC . What changes do I need to do in the above mentioned circuit ?

can i have more watts out of this circuit by butting higher transformers for example??

15. Rohit Bhuravane says:

can i use 18v 3Amp transformer with this circuit

• Yaseen says:

Hi Rohit Bhuravane
You can use18V 3A transformer, but output voltage become too low…it can’t drive devices.

• Rohit Bhuravane says:

cant i use a 24 watt cfl on this with 12 v 7aH battery

• Rohit Bhuravane says:

so kind of u bro to reply ……cant i use a 24 watt cfl on this with 12 v 7aH battery with 18v 3A;;;also what is the watt i can get with this

16. Jamey says:

Can you please tell me if I can use a centre-tap transformer in this circuit? If so, where will by centre-tap pin be connected? My inverter is not showing any output without the transformer

17. Pawan says:

What modifications do I need to do if I want to use a 6V, 5Ah battery as the power source?

• Yaseen says:

Hi Pawan
Replace transformer with 6-0-6/10A to get 60W output.

What can I use instead of 2SC4029

19. Michael says:

please sir, since the transistor serves as a switch, can one use relay?

• Yaseen says:

Hi Michael
Here in the circuit relay cannot be used instead of transistor as relay cannot be used for faster switching.

sir what is the replacement of 2sc4029 transistoir as it is not available in market easily plz reply me fast

20. Salkit says:

can I replace 6v 5Amp Transformer or ups transformer

21. mhafe says:

it is possible to use input 6v to output 220v, 100 watt?

22. sherry lein says:

can I use a 12V to 220V transformer?

23. VICKY says:

timing of time inveter work for 7.5AH ,12v battery with f bulb(40w) or tv?
can you give the for how long (hour) the inverter work ?
40w bulb and tv

24. rabz says:

if i use 555 as an oscillator and then fed this into tip122 and tip125 NPN and PNP combination will it work??
secondly after this combination in order to increase power i use 2n3055 and output current of tip combination is fed into 2n3055 is that ok??

help me out plzz

25. arjun says:

what is the specifaction of the battery i have to use here

26. Harsh Verma says:

How much is the building cost of this circuit.

27. shiv says:

can I use transistor bc547 or bc548 instead of 2SC4029

28. Colin Mitchell says:

Why is R3 2 Watt when only 12mA flows through it !!!!!!

29. sukky says:

hi Yaseen, Please I have a 12v 4ah battery and 12v-240v 1000MA transformer. Please what is the output power?.I made this circuit it works, but my question is that why is it that the output vary ? And how can I get a constant 240v output. .ADMIN KINDLY HELP TOO. THANKS

30. rakibul says:

can i replace transistor 2sc4029 with TIP41

• Omoniyi says:

I have buld 555ic base inverter but when i collect it with baery,the ic get bunt.please help me.how can i know which led of the transistor is common and emiter.can you indicate it by show the picture of the transistor with label.thank

• Mohit Agrawal says:

plz suggest me substitute for transistor 2sc4029

31. Harshit Kumar says:

Hey! Please help me. I have made the circuit but when i connect the transformer it does not work;when i check the input voltage of the transformer it show 12v (AC) when transformer is not connected but when i connect the transformer it show 0v. please reply.
-Harshit

32. reddy says:

Sir..
What is the main advantage of this inverter over igbt inverter??

33. reddy says:

Am very excting to do this project Can you please tell me the battery and transformer ratings(Ah&current) for 40w load???
Rly me as early as possible plzzz

34. pm says:

risk to electric shock by this inverter?

35. Nick says:

Sir
can you please explain why you use a diode ?

36. vipan kalra says:

How many watts of solar panel can be used to produce 12 v dc?

37. Ravi says:

sir
can you please send me the picture of this circuit on pcb

38. Khan says:

can I use the 2N5192 in place of the 2sc4029 as stated in the explanation of the circuit?
will it still have the same output?

39. anand says:

Hello sir I am using 9-0-9 volt transformer. What is it’s current ratting

40. Aatif says:

Plz share simpsle jnverter diagram

41. hossein says:

Hi tl494 is best ic for inverter

42. abdullah says:

Sir what is the volt of this capacitor?

43. ALINDA BUNYORO says:

is it posible to use a 220v- 9v 2amp step down transformer and yet am using 12v battery as power supply

And i cant get ic555 , cd4047, RFF44 mosfet Transistor (2SC4029) any replacement pliz help am at the buying components

44. harvey says:

hey howabout the connection for transformer

45. Ravi says:

Hi sir
Can you please explain the connections of battery.

46. Fey says:

Sir…how about the frequency?is the frequency about 60 hz like a normal frequency on AC?
is changing the resistors on timer 555 make any differences about the frequency?

• Jaseem vp says:

Hi Fey,
You can change frequency by changing Resistor value

-Jaseem

47. vips says:

Sir I implemented this ckt but proper output can’t obtained. 5W CFL are not working properly …so help mi

48. Chahat says:

Hi, I am trying to measure the voltage coming out of the circuit and it is only giving me a reading in mV, I can’t seem to figure out what is wrong. Could you help me understand some possible reasons that this could be happening? It would be a great help, thank you!

49. Njura says:

Hi, can your please list for me the items that I should use to get an a power output of 250W, 230VAC.

50. Divyam says:

i have made an inverter but the frequency is not remaining stable. can a monostable or astable multivibrator do this task.

51. PowerIndependent says:

Sir, what will hapen if I put 1kOhm 0.5w resistor? And can I use bc547 transistor instead of 2SC4029? Thanks

52. pranjali says:

sir can u conduct any classes for students like programing or designing then please inform me

53. Buddhi says:

I have 9v 0 9v transformer. Its very big step up transformer. I don’t know the amperage. Can I measure the Amperage of it. So how i connect to this ? BCos it has 3 inputs.9+ 0 9-

54. Tanmay Mondal says:

Sir, astable multivibrator base on the 555 timer IC, the output frequency from 555IC is
f=1/0.693(R1 + R2) C + 0.693 R2 C
So, how to I will be give 50 Hz across the ac lode according to your ckt. description. will you elaborate it plz………

55. Wisdom Allen says:

It first worked, but after a week of being kept, only the transistor got hot but no output detected again. Changed transistor, 555, resistors, and others, still no output. I used 2n3055.

56. RATs says:

Sir,
I have made the above inverter,But problem is that i m not getting 230v at output in place if that i m getting 100v as output.Do reply ASAP ..need ur help!Thanx

57. sathiya prakash says:

what is the application of this inverter . how it differs from the other inverters normally we are used in home.

58. nimesh says:

i want this transformer in10a range where it available?

59. harsh says:

hi we replaced transistor 2SC4029 by mosfect irfz44n

60. Yatin says:

What is d replacement for this transistor 2SC4029 as it is not available in market???

61. Yatin says:

can i use irf3205 mosfet bcz the transistor is not available in market?
plz do rply, its urgent,
Thank you..

62. Ilango says:

Hi,
Can we use some variable resistors (POT) to control the duty cycle and frequency separate from each other??? If not can you direct me to a circuit that can do that ?

Regards

63. bubbli_aish says:

Admin… can I use any other transistor if 4029 not available….??

64. spyros says:

My transformer is 12V to 220V 150VA. What component adjustments I have to do in order to work with my transformer and provide 220V at the end?

65. ashis mondal says:

dear sir, the given transistor 2sc4029 is not avaliable in the market. so what should i use instead of this????

66. Prathmesh udekar says:

Can I use two 6 volts batteries replace to 12 volt battery? Please give me a ans

• Yaseen says:

Hi Prathmesh udekar
You can use 6V battery, but you have to replace transformer with 3 or 4V.