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.
This circuit was found in a 80’s Popular Electronics. The components are common and the 8-ohm...
This configuration appears at several points in this section, obtained from different sources....
This circuit was found in the July 1992 Radio Electronics magazine. The output circuit must be...