Found in the December 1986 issue of Radio Electronics magazine, this circuit is designed to select 4 outputs with pulses from a pressure switch. The circuit includes LED indication.
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....