This touch switch uses components that have easy-to-obtain current equivalents. The power supply must be isolated and the cable to the sensor must be short.
June 2017 - New Honeywell MT MICROSWITCH Series can be ordered from Mouser Electronics for...
This two-transistor circuit was found in the January 1994 issue of Electronics Now. The circuit can...
This circuit is from American documentation from the 70s. Transistors are not common today, but...