This wired control circuit serves both volume and balance between channels. We found it in Radio Electronics magazine from August 1968. Transistors are common general-purpose types
Found in a documentation from the 90's, this circuit already includes an amplification stage. The...
This circuit was suggested by General Electric in 1969 documentation. It provides a maximum output of...
This oscillator that generates signals below the audible range (sub audio or infrasound) was found...