This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
June 2017 - New Honeywell MT MICROSWITCH Series can be ordered from Mouser Electronics for...
We found this circuit loader in a French magazine Electronique Radio Plans from July 1993. The...
This circuit comes from an English publication of 1976, consisting of an experimental touch key....