Metal Detector (CB21929E)

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

Triac Power Switch 2 (CB12412E)
This circuit, well known, since it is already present in other points of this website, is from an...
12V power supply (CB21780E)
This 12 V source provides 12A of maximum current and is suitable for powering mobile equipment. The...
Voltage Regulator 741 (CB16809E)
This circuit is from a 1976 documentation. It uses an operation that is still common in our...