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 is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...
The circuit presented was found in the 1994 National Instruments Linear Applications Handbook and...
This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of...