Cable Locator (CB21303E)

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

Optoelectronic Detector (CB4615E)
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
Missing Pulse Detector (CB13281E)
This traditional detector configuration is from an old publication where the MC1555 is the...
Shield for triac with TDA1024 (CB25080E)
We found this circuit in the October 1987 Radio Electronics magazine. The circuit uses an...