This high-sensitivity circuit was found in a 1980s documentation. The source can be a 9 V battery with a splitter to make it symmetrical. The shock can be 200 uH or more.
This circuit was obtained from Linear Technology's own component manual of the 1990s. The circuit...
This circuit is suitable for low impedance m icrophones. Gain is given by the 2M2 resistor. This...
This simple circuit applies to any sensitive SCR. We found it in 1982 Maplin documentation. ...