Monday, March 19, 2018

Circuit Schematic Inverter 100 Watts from 12V to 220V Based Transistor 2N3055

Robometricschool. - Do you want to build inverter for your appliance like lamp, mini TV, radio and other in this time? I will suggest yu to use the circuit schematic like in Figure 1 below.

This circuit schematic like in Figure 1 below, show you inverter from 12V DC to 220VAC with the power up to 100 Watts based on transistor 2N3055. So, the main component in this circuit is transistor beside the other component used like resistor, capacitors, diode, and also step up transformer.

Circuit Schematic

Figure 1. Circuit Schematic of Inverter 100W from 12V to 220V based on Transistor 2N3055 (Source:

Component List

  1. Q1-Q4______BC557___45V 100mA PNP Transistor
  2. Q5,Q6______BD139___80V 1.5A NPN Transistor
  3. Q7,Q8______2N3055___100V, 15A, 115W, >2,5MHz NPN transistor
  4. D1,D2,D3,D4_____1N4148______75V 150mA Diodes
  5. D5,D6_______1N4007 __1000V 1A Diodes
  6. R1,R4,R6,R7_________10K___1/2W Resistors tolerance: 5%
  7. R2,R3___________150K______1/2W Resistors tolerance: 5%
  8. R5,R6___________ 47K______1/2W Resistors tolerance: 5%
  9. R9,R12__________ 220 ohms 1/2W Resistors tolerance: 5%
  10. R10,R13_________ 560 ohms 1/2W Resistors tolerance: 5%
  11. R11, R14________ 100K ____1/2W Resistors tolerance: 5%
  12. R15, R16________ 10 ohms__10W Resistors tolerance: 5%
  13. R17, R18________ 150 ohms_1/2W Resistors tolerance: 5%
  14. C1,C2___________0.047uF 50V_____Ceramic capacitors
  15. C3,C4__________0.01uF 50V____Ceramic capacitors
  16. C5______________1uF 50V_____ Ceramic capacitors
  17. C6_____________0.1uF 250V____ Ceramic capacitors
  18. C7_____________0.1uF 50V_____ Ceramic capacitors
  19. C8____________220uF 25V_______ Electrolytic capacitors
  20. T1___230V AC primary to 12V-0-12V,2-8A secondary transformer.


Circuit schematic like shown in Figure 1 is Inverter 100 Watts from 12V to 220V Based Transistor 2N3055. Accordingly Eleccircuits site describe that transistors Q1,Q2 in the circuit is connected together as the astable multivibrator form. This Multivibrator will generate the output frequency about 100 Hz at the collector lead of Q2. This signal will sent to the two frequency divider makes the frequency is reduced down about 50Hz. It is because that the designing of this circuit will produce 50Hz in output.

Why it is not directly design the circuit to work at 50 Hz? It is 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. 


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