This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
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...