35 W Amplifier (T359E)

This class AB2 amplifier was obtained in a 1937 RCA tube manual. The circuit includes the dual high voltage power supply.

Darlington photo relay (CB8315E)
Found in Ferranti's 1968 documentation, this circuit uses a Darlington photo transistor to drive a...
Light level control (CB20718E)
Found in documentation from the 70s, this circuit uses components from that time. Some of these...
Battery Monitor (CB15080E)
This circuit monitors the state of a 12 V battery and can be used directly with one, or even in a...