This circuit was found in the Electronics Experimenter Handbook from 1991. The circuit controls a simple relay for the purpose of turning circuits on or off or switching audio channels.
The circuit shown has a differential input and employs transistors of an array of matched types. The...
This tunable circuit was found in the May 1994 issue of Electronics Now magazine. The circuit has...
This circuit includes the power supply from the power grid. We found it in Radio Electronics from...