Optical potentiometer (CB22159E)

This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is common and LED of any type.

Zirconium Arc Projector Power Supply (CB24201E)
This is a different circuit for a component from the past, the zirconium arc lamp used in...
Constant Current Source for LEDs (CB915E)
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...
Light-Controlled Oscillator (I) (CIR114)
This circuit uses a phototransistor as sensor. The changes in the resistance of the transistor,...