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RE: (ET) Problem with E20

Subject: RE: (ET) Problem with E20
From: "Chris Tromley" <chris_t microtrac com>
Date: Fri, 8 Jul 2005 12:26:59 -0400
In-reply-to: <o7xlnmhaqw1w7ns.080720051216@suppleye.com>
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Perry Cain wrote:

> What the varistor does is protect voltage spikes.  It "captures" them.  
> At
> some point, over time, it just cannot take it anymore and cooks.  A card
> #4
> problem just speeds this up.

Hmmm.

I don't have an E-20, mine is a New Idea EGT-150.  I do have a varistor on 
a
teeny little board with some diodes crammed onto it.  The varistor is 
toast.
But my tractor seems to run fine.

If it's supposed to be capturing spikes, might I be doing damage to my
tractor?  Can someone give me an "Elmer the Electron" description of what
the varistor does on an EGT-150 (similar to an E-15)?

Chris

References:
- (ET) Problem with E20
  - From: Perry Cain

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