We found this circuit in the September 1994 issue of Electronics Now magazine. The circuit uses off-the-shelf components and is powered by mains power.
We found this touch control on a Popular Electronics from 1970. The circuit makes use of an...
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...
This circuit, from the 1990 Motorola Dataar Databook, can be implemented with other comparators. The...