This is the 100W DC inverter build based transistored multivibrator as well as transistor signal amplifier. The inverter will convert 12V DC voltage in the input and increase the voltage level to become about 220V AC. 12V car battery is recomended to be used as the input, transistor 2N3055 is used as the amplifier. It will deliver the power output up to 100W and you can use this inverter for battery charger, emergency light and other electronic appliances.
This is the schematic diagram of simple 5W inverter circuit for Neon bulb. The inverter will convert the DC current (from battery) into AC current, from 12V DC to 220V AC with output power approximately 5 Watt.