With this circuit, using a single control voltage, you can increase the brightness of the lamp while the brightness of another decreases. The circuit applies only to incandescent lamps.
This circuit was found in a 1980s documentation. The indicated integrated circuits are uncommon...
This circuit is from Popular Electronics from March 1991. It can still be assembled with the...
This circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other...