Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a low battery indicator and a charge indicator.
This circuit uses two relays that switch when the voltage exceeds the value given by zener D2. The...
We found this circuit in the 1960 Mullard transistor manual. The transistor is made of germanium....
This circuit controls loads powered by the power grid, remembering that it is a half wave...