Antennoscope (CB21782E)

This circuit works as a useful field meter for radio amateurs. We found it in documentation from 1977.

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...