Static Electricity / Negative Ion Detectors


Posted on Feb 7, 2014

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 mat


Static Electricity / Negative Ion Detectors
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erial as this will reduce the effective gate impedance. Instead use an "open" construction technique soldering each component should be a centre zero type. Full scale deflection can be 1mA or 250uA for greater sensitivity. Remove the meter and use a multimeter to measure the voltage between FET drain and the preset resistor. Adjust the preset for 0 volts and then replace the meter. This will avoid can be monitored by moving the probe in front of it. As the detector responds to changes in charge, you may need to move the detector around to see the effect, but it will prove the




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