Using an LDR, this Philips circuit directly activates a relay when light strikes the sensor. The relay is 45 V with 20k coil resistance. The 220 nF capacitor must be polyester for 400 V.
November 2016 - The new OLED modulator for displays with 2 x 16 format can be obtained from Mouser...
This is a configuration that can be used in analog calculations by adding and subtracting...
This circuit is from old documentation, but it can be implemented with more modern equivalent...