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 common 555 circuit was found in documentation from the 90s. The circuit uses two 555s and the...
This type of circuit, found in American documentation from the 1980s, triggers producing output...
This circuit is nothing more than a voltage quadruplicator that can generate close to 1 000 V from...