Static Electricity Detector

  
This circuit relies upon the extra high input impedance of a FET, and also demonstrates the gate terminals sensitivity to changes in voltage. The gate terminal here is left open circuit, connected only to the `probe` this being just a few inches of bare copper wire. With no fixed DC biasing, the gate terminal will respond to micro changes in voltage or `field strength`. It is important not to make this circuit on veroboard or PCB material as this will reduce the effective gate impedance.
Static Electricity Detector - schematic

Instead use an "open" construction technique soldering each component together. The probe should not be touched directly and is best insulated in a plastic pen sleeve. As static electricity can have either a positive or nega



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