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 500W power inverter circuit, converting a 12VDC battery (usually car battery) to become 220-240V AC power. The inverter is powered using 6 pairs of transistor TIP35C which connected in parallel, so it will be 12 TIP35C transistors.