We found this circuit in the June 1992 issue of Radio Electronics magazine. The sensor is a common diode. The circuit is powered by the power grid from a 12 V transformer.
Using a tunnel diode, this circuit was found in a 1966 American publication. The circuit is for...
Found in 1969 RCA documentation, this circuit maintains constant current in the filament of a lamp...
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...