Metal Detector (CB21929E)

This two-transistor metal finder was found in a Raytheon manual from the 1950s. The transistors are germanium from the time.

Two-input flip-flop (CB23553E)
This circuit was obtained from Radio Electronics magazine in May 1958. The circuit uses...
DC motor proportional control (CB7283E)
This bidirectional motor control was found in an 80's Electronic Engineering. The circuit uses a...
5V power supply (CB21160E)
This 5V power supply with a 1.5 to 3 A current was found in Maxim documentation from the 90s. The...