In remote villages, there is often power outages. Some universities will also have power outages at night, and those who like to stay up late will not have electricity. But that's okay, you can solve this problem.
This is very easy to make an inverter that can turn the 12V supply voltage to be 220V. The circuit is driven by a multivibrator consisting of BG2 and BG3, and then driven by BG1 and BG2 to control BG6 and BG7 operation.
The oscillating circuit is powered by the regulated power supply of the BG5 and DW groups, which makes the output frequency relatively stable. At the time of production, we can choose the commonly used AC transformers with dual 12V output. A 12V battery can be selected as needed.
This schematic diagram can also be used for small generator for home use.