This electronic defense was found in the 1990 special issue of Radio Electronics Experimenter magazine. A few hundred volts is generated.
This circuit was found in an American 1980s documentation. Equivalent operational amplifiers can be...
This busy line indicator is very simple, serving for analog lines. The supply is made by two...
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...