Some time ago, I reverse-engineered a low-cost inverter made by Vector Mfg. (now Black & Decker). It uses a classic 2-BJT astable multivibrator (AMV) but with a circuit design twist, as shown below.
There are 3 types of multivibrators: astable, monostable, and bistable. This astable multivibrator is an oscillator that generates rectangular pulses. It uses transistor switches and RC networks. The ...