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
This circuit uses the 7493 to divide a TTL square signal by 8. The circuit must be powered from a...
This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974....
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...