Found in the documentation on PCs, this circuit excites LEDs whose current is determined by R3.
This circuit consists of an electrostatic sensor that can check if a cable is energized by simply...
This circuit was found in a 1979 magazine. We can use any JFET like MPF102 or BF245. The relay is 12 V...
This circuit supplies a load with pulsating direct current that can be filtered by C1 (10 uF to...
