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 is the receiver for the transmitter suggested in CIR13081. The configuration is old, and...
This circuit generates 50, 100 and 200 Hz signals from a 3.2768 MHz crystal and has outputs...
This configuration found in a Motorola documentation consists of an experimental circuit that uses...