HV_STATIC_DETECTOR

Published:2009/7/13 3:45:00 Author:May | From:SeekIC

One leg of a Wheatstone bridge is replaced by an MPF102 N-channel JFET. The JFET's high gate input impedance turns the simple bridge circuit into a very sensitive high-voltage static detector.The JFET's gate is tied to ground through four 22-MΩ resistors. A 1- to 2-in piece of solid-copper wire is connected directly to the JFET's gate and serves as the input sensor. With the sensor clear, adjust R8 for a zero meter reading. Run a comb through your hair and move it toward the sensor.The meter should go off the scale. Place the staticsensor next to your computer or any static sensitive equipment and take special notice when the meter moves.



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