Cable Locator (CB21303E)

This audio detector circuit can be used for cable identification. We found it in a Popular Electronics from the 90s.

Negative Pulse Detector (CB14835E)
This circuit trips when a negative pulse is applied to its input or when the voltage drops below a...
Developing Table For Silk Screen (CB4445E)
This is an old 1988 circuit consisting of a timer or time control for exposing silk-screen arrays. The...
Triangular and square signal generator (CB21448E)
This circuit was taken from an old American documentation. It can be built with modern op amps. The...