This circuit uses two relays that switch when the voltage exceeds the value given by zener D2. The circuit is from a Radio Electronics magazine from April 1975.
This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating...
We found this circuit in documentation from the 1980s. The transistors can be the BC558 and the...
This is the power supply indicated for the previous circuit (CB18905E) providing a voltage of 24 V...