Found in a 90s PE Hobbyst Handbook, this circuit mimics the sound of a space gun. The components are common, and changes can be made to modify the sounds.
We found this circuit on Radio Electronics from July 1990. It triggers a relay with a touch of the...
These three circuits have different treble responses. We found them in the February 1970 issue of...
This photoelectric cell light relay was found in Radio Electronics magazine from April 1958. The...