In the 110 V network, capacitors of 200 V or more and in the 220 V network, capacitors of 400 V or more, can be tested in this simple circuit. The indication is given by a neon lamp.
This transistorized circuit is powered by a voltage of 6 to 12 V providing high voltage for a neon...
This circuit causes an LED to blink when night falls. Sensitivity is set at R1 and the blinking...
This low-current power supply was obtained in Japanese documentation from 1968. The currents are...