This is the schematic diagram of 300W power inverter circuit. The circuit use timer IC NE555 as to produce the wave / AC voltage signal. The signal the fed to the final amplifier to be amplified and to powered up the signal. There are many 2SD1047 transistor to amplify the signal. The transformer used to increase the voltage level to 110V or 220 refer to your needs.
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.