I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor availble that time and hard to obtain today. The circuit is indicated for phono applications using variable reluctance transducer.
This circuit using only transistors was obtained from Ferranti's 1969 documentation. It can be...
This circuit was found in documentation from the 1980s. It is powered by the audio signal that must...
This isolated non-synchronized triac and optocoupler circuit was found in the August 1992 issue of...