We found this circuit in the October 1994 issue of Electronics Now magazine. The circuit uses a now-uncommon 4046 PLL and the gates of a CMOS 4001.
This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...
This circuit was found in a NASA documentation from the 1980s. Component values are application...