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-phase regulator (CB21169E)
This two-phase regulator circuit was found in an Electronic Design from the 90's. The components used...
Audio Capacitor CIR12335E (CB12335E)
The frequency of the produced sound depends on the capacitor. With capacitors of known values, you can...
Solenoid driver (CB9729E)
We found this circuit in an old documentation. The indicated solenoid is of low current type,...