If we are using a multivibrator whose timing is determined by analog means, we will need to take component tolerances into account. In a recent column on the topic of “Registers vs. Latches vs.
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.