This circuit was found in the February 1983 issue of Radio Electronics magazine. It is a 4-digit circuit with dedicated integrated circuits, with no power supply indicated.
We found this circuit in a French technical documentation from 1982. The circuit is still current, as...
This circuit from a Radio Electronics from February 1966 uses an LDR as a sensor. The transistor is a...
This circuit is from a 1968 General Electric manual. It produces a pulse of light when fired,...