This 3-digit digital gauge was found in the July 1900 issue of Radio Electronics magazine. The circuit is based on the CA3161 and CA3162 A/D converters of the time.
The varactor or varicap diode tunes the signal for listening to SSB signals on a common receiver. The...
This circuit was found in a Hands On Electronics from the 90s. It turns on an LED to indicate that...
This circuit was found in a 1960 transistor manual from Sylvania. The components are from that...