This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.
Found in the March 1992 Radio Electronics magazine, this circuit has two supply voltages. The...
This transmitter, indicated for espionage applications, is permanently powered by the power grid....
This oscillator or clock generator generates rectangular signals and frequencies up to 100 kHz....