This electronic defense was found in the 1990 special issue of Radio Electronics Experimenter magazine. A few hundred volts is generated.
The circuit shown, found in a 2004 documentation, allows the use of a telephone, without the...
This simple circuit needs a high gain stage to compensate for losses. It consists of a passive tone...
The time constant for this circuit found in a 1973 publication is given by R and C. The shot is...