# 230V SIMPLE INVERTER CIRCUIT USING 555 TIMER

This is another simple DIY electronic project, INVERTER. I hope you are already familiar with the term INVERTER. INVERTER is used to convert low Voltage direct current (DC) to high Voltage Alternating Current (AC).

By using an inverter you can generate 230V, 50Hz power supply from a 12V battery. This circuit may very helpful to you at the time of Power Failure. ie; you can power any device, commonly works in single phase AC supply at the time of Power cut by using a battery (rechargable battery is recommended).

### CIRCUIT DIAGRAM

 Circuit Diagram

### COMPONENTS USED

IC1   - NE555
Q1    - TIP 41A(NPN)
Q2    - TIP 42A(PNP)
T       - Stepup Transformer
R1     - 10KΩ
R2     - 150KΩ
C       - 0.1μF
C1     - 0.01μF
C2     - 2700μF

### CIRCUIT EXPLANATION:

The circuit mainly consisting of a 555 timer IC, an NPN and PNP Transistors and a Stepup Transformer. The 555 timer IC is powered by a 12V battery. The timer IC(NE555) is wired as an ASTABLE MULTIVIBRATOR in this circuit. It will generate alternating non sinusoidal output wave form at the instant we giving supply voltage(12V). Thus primarily we generated alternating voltage from direct current (Battery). The output from 555 Timer is given to the base of two transistors, PNP and NPN. These transistors help the output voltage to increase its current for both the positive and negative cycles. The output from these transistors are again fed to the input(primary) of a stepup transformer. This will up-convert the input voltage to desired level (230V). The frequency of power supply is determined by resistors R1, R2 and C, connected with 555 timer IC. You can even change them as per your requirement. For that you can use our 555 Timer Frequency Calculator. Here i am using 50Hz power supply, so it is enough to use 10K, 150K and 0.1mF for R1, R2 and C respectively. The output is taken across the secondary winding of transformer. Be careful the output is 230V power supply it may cause you serious injuries.

### CAUTION

• THE OUTPUT VOLTAGE IS TOO HIGH, SO DON'T TOUCH THE OUTPUT TERMINALS.
• Don't short down any part of this circuit, which will burst out!!!
• It is not suitable for childrens.

### Tittu

#### Author & Editor

I'm Tittu Thomas, An Electronics and Communication Engineer from India, Kerala. I love doing hobby electronics circuits, blogging, programming, etc. Started this blog while doing my B-Tech degree under CUSAT university.

#### 88 comments so far:

1. I just built this circuit.
No output at all.
have used 10k, 160k (measured resistance of 150)
0.1 microfarad polarized but might be in wrong way round?
0.01 is a non polarised flat rectangular red one
And I have used a 2200 and 470 microfarad pair in parrallel to get 2670 microfarad but again they are polarized and may be incorrectly inserted.
What way round do the capacitors need to be please and am I ok using polarised for the 0.1 and 2700, and non polarised for the 0.01.
Thanks in advance

2. Don't worry i will help you on this....

First you have to setup the circuit, without Q1, Q2 and output transformer (just an astable multivibrator) and check if there any output voltage.....and reply here

I hope it helps you.....

3. Firstly, thankyou for your help.
Ok, I have set it up as you stated without the transistors or the large capacitor or the transformer (not yet obtained).
I have taken a reading from pin 1 to pin 3 of the 555 chip and am getting 7 volts d.c. (in the positive with black lead on 1 red lead on 3.

4. It also reads 14.2 with an ac voltmeter with black lead on 1 red lead on 3.
With black lead on 3 and red lead on 1, the a.c. Voltmeter reads 0.00
Thanks again.

5. Check the output by using an LED.....

Connect the positive terminal of LED to pin 3 and negative terminal to pin 1 (GND)
through a series resistor of about 1K. If it glows it means your first stage is alright and you have to go for the next.

All the Best.....

1. sir,
i m getting output at each and every step but not at the transformer's secondary.......
please help...

6. Yes, the led lit up.
Where do I go from here?
Thankyou.

7. Now connect transistors Q1, Q2 and Transformer(step up), and check the output using an ac multimeter. (without connecting capacitor C2)

Be careful the output voltage is quite high(230V)....

8. What ratio of transformer windings do I need?

9. 0 to 12v transformer is preferred

10. what do you mean? 0 to 12 volt?
Also with regard transistors, are the bases connected together and then connected to chip pin 3 ?
Thx

11. 12V transformers are readily available in the shops.

Do the remaining as shown in circuit.

12. Please can you tell me base, collector and emmiter locations for each transistor in your drawing. Thank you.

13. Are the bases connected together and to pin 3 of the chip please.
I cannot read circuit drawings.
This is why I asked.
Thank you

14. Base terminals of both the transistors are short circuited and given to the pin 3 of Ne555 ic.
Similarly, emitter terminals are short circuited and given to the input of transformer.

Just click on the image (circuit diagram) to open it in Full screen.

15. Ok I am winning now, I have 130 volts ac at ouput.
I think I blew up a transistor when I had the pair attached together to a heat sink.
I have the large capacitor in with 'plus' to the emitters.
So which transistor have I blown up?
Thank you for your persiverance

16. Congratz!! You are so Brilliant.....

17. Hi,
I have question, I am unable to find TIP41A & TIP42A :( so are there any substitutes for those two transistors? Thank you.

18. TIP41A & TIP42A, are current driving transistors.

You can try SL 100 and SK 100, instead of Q1 and Q2.

19. Are there any special step up transformers or can I use a 230v-12v 50hz transformer with the 12v as my primary....

20. Are there any special step up transformers or can I use a 230v-12v 50hz transformer with the 12v as my primary....

21. How do I tell the difference between a step-up and a step-down transformer

22. In a Step up Transformer, the secondary winding is greater than that of Primary....

You can use a 50Hz, 12V, Transformer with its primary(Having Less winding) as input and secondary(Having more windings) as output.

23. Thanks.... I'll try it out now....

24. Dear sir.
How much output getiing from this circuit. can I use a Fan and a tubelight? what about charging of battery?
please reply me

25. @daily,

This circuit is capable of generating 230V, 50Hz output. Try it......

26. Im chandrasekar - madurai - TN
I want the details about the stepup transformer and Is it easily availble in market?
how much output to be connected?
please reply me clearly

27. Hi Chandrasekar,

As i mentioned in my previous comments, it is Easy to find a 12V Transformer.

28. nice inverter, what parts will be change and add to this circuit to build 500 watts.Tip 41a not available to my place,2n3055 can replace to q1 and q2? thanks

29. You can use any current driving transistors, instead of Q1 and Q2. The output power depends on the transistors used.........

Best of Luck.......

30. i have another quetion
u only told capacitor microfard range,pls tell voltage range

31. this ckt is use full for cfl bulps

32. can mosfets be used in place of Q1 and Q2?

33. I think it doesn't works, any way you can try.....

Best of luck....

34. How can i make it for 500 watt output

35. Hi Surendra Gupta,

Sorry,This circuit is not suitable for higher Power outputs.........

36. What is the power can i get from this....?

37. i am not an expert in all these, but can u tell me if i use this to run a normal fan, how much time will it run?! i am interested in trying this circuit live...!

38. Hello Asif,

Thank You for your Interest and wish you all success.....

39. Please tell the maximum output power of this.

40. If you use higher power transistors like the 2n3055
can you get more power out of this circuit-or what is the max power this circuit will deliver

41. I understand the above circuit will not work for higher power ratings - such as 500 W. I also understand we will need to change the transistors for higher power ratings. Can you please let me know what transistors I can use for a 500 W output?

Nazir

42. The output power will increase if you use transistors with higher power ratings....

43. WHATS THE MAX. OUTPUT POWER FROM THIS CKT. ARRANGEMENT

44. This comment has been removed by the author.

45. what is the wave form of this circuit ?

46. 555 Timer IC is wired as an astable multivibrator..
So the output will be square in shape....

47. sir i m a beginner in electronic projects
so can u please notifies the estimated cost of variuos equipments used here.

48. where will i connect that ground point??

49. All the components used in this circuit is cheap....

50. Connect the ground to negative terminal of your 12V battery

51. what is the specification of the step up transformer to be used here?

52. use a 12V stepup transformer

53. @Anonymous Hi, use a high amperage transformer to suit your needs. For example if you want 50w output, then connect a transformer which will give 60w output. A 12v 5A transformer will then work for you.

54. @Anonymous
555 IC = 5Rs
Resistor & capacitor = 10Rs
Transistors = Approximate 40Rs
Output Transformer =200Rs
General board = 10Rs
IC socket = 5 Rs
12v 7 Ah battery= 750Rs
input Transformer = 100Rs
Components for charger circuit= 40Rs.
Relay = 25Rs (for automatic working)
Connectors = 20Rs
Cabinet = 100Rs
AC Cord = 25 Rs
Output AC Plugs = 3*18 =54Rs

1. Thank You very much Vinod......

55. wats the current specification of the transformer?

56. @Anonymous

you can use a Transformer with current rating 400mA.

57. The Output Power of this circuit is about 100Watts

58. can i use12v,1amp btry to tis ckt

1. Yes, you can use it.....

59. pls help me
i am doing tis prjct no o/p comes,in a o/p (pin 3)is 5.6v,and then using transtor sl100 & sk100 and thre o/p comes only 5.2v in node of emitter pins & gnd,so i askng any error that hw to correct,
and then i have a 12-0-12v,3amp transformer how to coonnect to get o/p
in a transistor emitt pins how much volt to want come?

60. pls help me
i am doing tis prjct no o/p comes,in a o/p (pin 3)is 5.6v,and then using transtor sl100 & sk100 and thre o/p comes only 5.2v in node of emitter pins & gnd,so i askng any error that hw to correct,
and then i have a 12-0-12v,3amp transformer how to coonnect to get o/p
in a transistor emitt pins how much volt to want come?

61. Does you use 12V Power supply,.....
If yes then,
Try with the transistors
TIP 41A(NPN)
TIP 42A(PNP)

Check the output using a multimeter, switched to AC mode.

62. hi can you plz tell output of this ckt is square wave or sine wave???

1. The output will be square.....

If you want sine wave then try

Sine Wave Generator

63. hey is this ckt can be driven by 200ah,12v deep discharge battery????

64. This comment has been removed by the author.

65. tip 41 tip 42 not availabe please suteble another transirtors

66. hai. I had tried this circuit. Getting output of about 120v with a 12v bike battery. Can we connect a 24v battery with 10amps of current? I mean inverter batteries. And how much output we will get?

67. No, Don't use 24V 10A battery on a NE555 ic, it is not capable to withstand such a High power.

68. ok i understand. Can we connect 12v 10amp or 24v 10amp battery by using a 78xx series voltage regulator. Or there are any other ways to maximise its voltage to 250v? This setup was not capable of glowing a bulb fully.

69. if overload occurs at that time wt will we do..

70. Hi Mr.Tittu Thomas Hope you are Fine. . . if possible can you help me out with this circuit step by step please i would be highly thankful. . . regards Shahrukh

71. Hai,
in my place not get transister 41&42.I am used tip22&27 but no output.

72. Sir myself mahesh i want to know that how much time the backup of this circuit wd a fully charged battery plz tell me sir....

73. Dear sir i want to know hw much backup time will be by this circuit wd a fully charged batter plz tell me...

74. hai sir iam sathish.i have one dought sir. please tell me which place input supplay is giving to the circuit.and how the 12v dc battery is charging

75. hai sir please kindly tell me which place input suplly is giving to the circuit.and how the 230v convert 12v dc please tell me sir

76. hi there,
how did u find the components for this circuit? i mean how do you know these will definetly works this circuit? please help me

77. can this circuit is safely used for mobile phone chargers??? its output is sine wave or not??

78. Sir Tittu Thomas or anyone knows here, I have a question what type of capacitors will I use on C & C1? please can anyone answer. :)

79. The Capacitors C and C1 are, non polarized ceramic type.

1. hello sir !
where can we use the relay in this circuit?

80. the transformer rating is 130-1

81. this circuit works. the output is square waves with the ic555 timer which means that a low impedance / low power bulb may light but it will flash because the circuit will never create 180' out of phase frequency. And yes, this will generate high voltage(120v - 300 V , depending on the transformer winding coil) but at very low current. (* high volage , low current )

82. after building this circuit i measure 130 vac but it doesnot glow the bulb ,just i want to glow he bulb ,is it possible ?
pls reply as soon as possible

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