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.
We got this circuit from Radio Electronics from July 1990. The circuit mimics the sound of the red...
We found this basic circuit of a relaxation oscillator with unijunction transistor in a 1976...
We found in an old documentation how to use a 555 as a monostable key. The circuit should not be...