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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 :

• How to make an Electrostatic Polarity Detector(Electric Field Detector) https://www.youtube.com/watch?v=WptwVzK7cK0

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

Apr 3, 2012 For more from the AT&T Archives, visit http://techchannel.att.com/archives

On an elementary conceptual level, this film reflects the multifaceted scientific hyperthinking that was typical of a Bell Labs approach. Host Dr. J.N. Shive's presence as a lecturer is excellent - it's understandable by a layperson even when he branches into equations, because he uses copious amounts of real-world examples to bolster the material.

Shive's role at Bell Labs was more than just a great lecturer: he worked on early transistor technology, inventing the phototransistor in 1950, and the machine he uses in the film is his invention, now called the Shive Wave Machine in college classrooms.

Dr. J.N. Shive of Bell Labs demonstrates and discusses the following aspects of wave behavior:

Reflection of waves from free and clamped ends Superposition Standing waves and resonance Energy loss by impedance mismatching Reduction of energy loss by quarter-wave and tapered-section transformers Original audience: college students

Produced at Bell Labs

Footage courtesy of AT&T Archives and History Center, Warren, NJ