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 obtained from a Linear Technology manual from the 1990s. The components may have...
Having the telephone conversation interfered without notice is very uncomfortable. So that the...
This circuit generates a signal rich in harmonics that extends up to close to 1 GHz, serving for...