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.
Found in a 1980s telecommunications documentation, the circuit presented acts as a product...
This simple low power triplicator was found in 90’s American documentation. The diodes can be...
This gain 10 CMOS op amp was found in the May 1993 issue of Electronics Now magazine. It is...