This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
This is the radio receiver for the previous infrared alarm radio transmitter. It contains the...
We find this circuit in an American 1980s documentation. The circuit can still be assembled...
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...