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.
This circuit was obtained in a Radio Electronics of the 90s. The circuit uses an integrated circuit...
This squelch is activated by its own noise, acting automatically. It is used in communications...
In this circuit of the 1980s, the T1 transformer has 30 turns of 28 primary wire and the secondary...