Inverter Project 12v DC to 120V AC

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An Inverter is a device that converts 12 volts dc to 120 volts ac, which is what we use in our homes.  This project will handle about 300 watts, which is perfect for lights, small T.V.'s and radio equipment.

This Inverter takes 12 volt dc and steps it up to 120 volt ac.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1. This inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts. If Q1, Q2 are 2N3055 NPN Transistors and T1 is a 15 A transformer, then the inverter will supply about 300 watts. Larger transformers and more powerful Transistors can be substituted for T1, Q1 and Q2 for more power.

Note:  Don't try to run inductive loads (motors...) off this inverter.

Inverter Schematic

12v DC to 120v AC Invertor Circuit  Diagraam |

Parts Used in Inverter

C1, C2

   68 uf, 25 V Tantalum capacitor

R1, R2

   10 Ohm, 5 Watt resistor

R3, R4

   180 Ohm, 1 Watt resistor

D1, D2

   HEP 154 Silicon Diode

Q1, Q2

   2N3055 NPN transistor (see "Note")


   24V, Center Tapped Transformer


   Wire, Case, Receptacle (for output)


Fuses, Heat sinks, etc.


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