Found in a 1966’s General Electric documentation, this circuit uses a triple diode from the time. The output current is 5 mA. It serves as a voltage reference.
This circuit for testing commercial NPN and PNP transistors was found in Radio Electronics...
The reference source for this circuit is a 1968’s Motorola publication. The circuit can be...
This circuit open and close the relay in intervals adjusted by the potentiometers. The capacitors...