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.
Of course, the design indicates a specific application for a touch switch. Thus, analyzing the...
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...
This circuit uses a 741 operational amplifier that must be powered by a symmetrical source of 6 to...