The figure shows a white noise generator circuit that uses a transistor junction to generate the signal. The circuit is from a Radio Electronics magazine from March 1990.
This sequential circuit appears in other versions on this site. This is from American...
Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz...
This beat frequency oscillator or BFO was found in an American 1980s documentation. The circuit is...