Cable Locator (CB21303E)

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

Vibrato (CB23942E)
This sound effect circuit was obtained from an article in the April 1969 issue of Radio...
Robot Eyes (CB12397E)
Found in a 1990 Electronics Handbook, this circuit causes an LED to flash when the phototransistor receives...
Sound Effects (CB26015E)
Found in the May 1997 issue of Electronics Now, this circuit produces a variety of sound effects for...