Found in McGraw Hill documentation from the 1990s, this circuit supplies high voltage to the electrodes of a Kirlian machine. High current MOSFETs can be used.
The purpose of this circuit presented in a 2009 documentation is to monitor, by means of neon...
This circuit was found in old FET documentation, but it applies to any modern common JFET. The...
This simple voltmeter was found in Popular Electronics from May 1968. The circuit makes use of a...