ELECTROSCOPE_CIRCUIT

Published:2009/7/16 4:46:00 Author:Jessie | From:SeekIC

This circuit detects a charged object at a respectable distance and displays the polarity (positive, negative, or earth-grounded) and relative intensity. In operation, C1 reduces ac noise but lowers the sensitivity a bit. The MPF102 and R1 form a voltage divider. When the FET's gate is earth-grounded, the divider's output will be about 4.5V, giving a half-scale reading on M1, a 200-μA meter. A positively charged object (like cotton-rubbed glass) will give a positive deflection from half scale, and a negatively charged object (a plastic comb, for example) will give a negative meter deflection. The whole circuit (including the 9-V supply) should be in a metal enclosure.



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