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Electrostatic field detector (MOSFET based)

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Hi, guys.

I've read several descriptions of pretty simple device for electrostatic fields detection, based on MOSFET transistor, but i've found no schemes or details and i can't understand how this device actually works. Does anybody heard about it? May be you can give me some explanations, references etc...

I want to discover fields around the human body. Particularly, i have intention to detect acupuncture points with this device.

Thanks in advance!
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