This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering an LED. Trigger adjustment is done in a trimpot.
This space mark demodulator for FSK signals was found in an American telecommunication...
This precision oscillator was found in the October 1992 issue of Radio Electronics magazine. The...
This 100 kHz crystal controlled oscillator was found in an American 1980s documentation. The...