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 is a different circuit for a component from the past, the zirconium arc lamp used in...
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...
This circuit uses a phototransistor as sensor. The changes in the resistance of the transistor,...