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.
Found in Motorola documentation from 1967, this circuit shows how it is possible to obtain a...
This circuit for analog VHF televisions was found in the 1989 Radio Electronics Experimenter...
This circuit turns on incandescent lamps (do not use any other type) when it gets dark. The...