This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of analog televisions of the time. The integrated circuit used is uncommon today.
This bidirectional optical switch detects the direction of movement of an object that passes...
This low-frequency circuit for alternating signals is from an early American 1980s documentation. The...
This configuration was found in the January 1992 Radio Electronics magazine. The frequency is set...