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Thursday, December 31, 2009

Simple Electrostatic Charge Detector Circuit

This is one of design for detect electrostatic charge. This circuit is called as electroscope is a device that is used to detect electrostatic charges. This is a simplest form of the detector. This is the figure of the circuit.


To reduce AC noise this circuit uses C1, but it will lower the sensitivity a bit. As a voltage divider we use the MPF102 and R1. The divider’s output will be about 4.5V diving a half-scale reading on M1, a 200-uA meter, when the FET’s gate is earth grounded. A negatively charged object such as a plastic comb will give a negative meter deflection. A positively charged object such as cotton-rubbed glass will give a positive deflection from half scale. The whole circuit should be in a metal enclosure and short piece of bare wire makes a fine charge collector.

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