This is the scheme diagram of 500W power inverter circuit which build using 10 pieces of well-known NPN power transistor 2N3055 to amplify the AC signal produced by multivibrator. The frequency generator / multivibrator is built based on transistors too. All of the components is easy to gathered from the electronic store.

This is the transistored power inverter circuit diagram, capable to handle up to 500W output loads. The circuit built based 50Hz square wave generator 4047 and square wave signal amplifier based power transistor 2N3055.