The purpose of this circuit is to cut off the high voltage when the bias voltage fails. The circuit is from a 1975 documentation and can be adapted for other purposes.
This circuit transmits signals to an FM receiver at a distance of up to a few tens of meters. The...
We found this oscillator in a documentation from the 70s. The FET can be MPF102 and the crystal is 1...
It can be obtained from Mouser Electronics, sensors (receivers) transmitters and benders for...