This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American...
We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...
This oscillator that operates at 80 kHz was found in the July 1993 issue of Electronics Now...