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 simple timer uses one of the six inverter ports on a CMOS integrated circuit. Rx and Cx...
This circuit was found in an American 1990s documentation. It can directly trigger a triac when...
The purpose of this circuit found in the September 1977 issue of Radio Electronics magazine is to...