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Topic: Elmo ST-1200 problem
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted April 05, 2018 03:02 PM
Well, as I said, an Electrolytic capacitor is basically a can of fluid. On one terminal you have a metal plate. When a voltage is applied, a very thin insulating layer forms between it and the conductive electrolyte. This layer between the conductive fluid and the plate forms a very good capacitor. Most of the largest capacitors for power filtering and energy storage are of this type.
When the cap is allowed to sit unenergized, this layer gradually breaks down and the capacitance is slowly lost.
If you apply voltage backwards, the layer breaks down, the thing conducts like crazy, overheats and "BOOM"! (Actually smells like a fishing boat before the Mate hoses down the deck...)
My hope is by starting out low I can tickle that layer into forming again, or maybe do no worse than popping the fuse.
-------------------- All I ask is a wide screen and a projector to light her by...
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