Found in American documentation from the 90's, this circuit is very current and can be implemented with transistors of general use. Never use a power supply without a transformer.
November 2016 - The TL3780 ultra-miniature E-switch touch switches can now be obtained from Mouser...
With this circuit, power cables can be detected by simply approaching PP. PP is an antenna or...
This amplifier configuration for instrumentation with two operators was found in a circuit manual...