Employing a unijunction and a triac of the era, this 1964 Electronic Design circuit uses a diac to trigger the Triac.
Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using...
The frequency of the tone produced by this oscillator depends on the amount of light falling onto...
This circuit, found in a 1979 documentation, consists of a small inverter that applies a voltage to...