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Feb 21, 2018 This is an electrostatic polarity detector with increased sensitivity. This device makes it possible to investigate the polarity of the high voltage. RED LED = Positive, BLUE LED = Negative, Both LED = Alternating Voltage On the HVDC line, only one LED will be on. How to make an Electrostatic Polarity Detector :

Jun 7, 2017 This is a simple Electrostatic Polarity Detector(Electric Field Detector) made of FDS8958A Chip. This chip(FDS8958A) contains N- and P- Channel Enhancement mode power field effect transistors. Old Version : Using 9V battery. New Version : Using 3V battery. The circuit diagram appears on the video. 07:13

IRF 7317 is replacement part for FDS8958A - Thomas Kim 2017

See improved schematic by Thomas Kim in 2018 https://lemmy.staphup.nl/comment/66129