This is one of many possible touch switch configurations using CMOS integrated circuits. The circuit is from a 1980s American documentation. The power source must be isolated.
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
This circuit was found in Motorola's 1968 documentation. It can be built on current equivalent...
This circuit matches a high impedance input signal with a low impedance output. This circuit is...