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Warning: don't connect the battery until you are SURE you've hooked everything up exactly right. It's possible to burn out the FET or the LED if they are connected incorrectly. Don't let the transistor's wires bump together even briefly, or it will flash the LED and burn it out.
Build this simple "electronic electroscope," a FET electrometer
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Basics \ Wiring ALPHA 1.0
ELCTRONIC PARTS
SERVO HACK
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