Re: Filtering on Neons
Subject: Re: Filtering on Neons
From: MSR7-at-PO.CWRU.EDU (Mark S. Rzeszotarski, Ph.D.)
Date: Wed, 7 Feb 1996 14:37:20 -0500
>Received: from slc5.INS.CWRU.Edu (slc5.INS.CWRU.Edu [188.8.131.52]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with ESMTP id MAA15912 for <tesla-at-grendel.objinc-dot-com>; Wed, 7 Feb 1996 12:37:47 -0700
>>From ed-at-alumni.caltech.edu Wed Feb 7 01:14 MST 1996
>>Received: from tybalt.caltech.edu (root-at-tybalt.caltech.edu
[184.108.40.206]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with ESMTP id UAA16415
for <tesla-at-grendel.objinc-dot-com>; Tue, 6 Feb 1996 20:33:27 -0700
>Date: Tue, 6 Feb 1996 19:32:45 -0800
>From: ed-at-alumni.caltech.edu (Edward V. Phillips)
>Subject: Re: Filtering on Neons
> You are correct about the construction techniques needed
>to handle high voltage across chokes used to protect neon (or
>any other) transformers. My thought at the moment is to use
>long coils on 1/2" by 8" ferrite rods, with lots of turns of
>closewound enameled wire. Think will provide the inductance and
>the high voltage insulation, while enough turns will take care
>of core saturation. Have been looking at the local stock here
>and intend to give it a try when time permits. As far as the
>voltage is concerned, I think a long winding will work OK, but
>want to check it out because ferrite has a very high dielectric
>constant and there may be unexpected problems because of that.
Regarding ferrite filters:
I have experienced arcing between the windings and the toroidal core
of ferrite chokes I have wound. The arcing was observed when the capacitor
was placed across the transformer. (Now I have the spark gap across the
transformer.) I also now wind my chokes using liberal amounts of "hot glue"
(polyethylene) to provide additional insulation. I haven't tried the long
sticks of ferrite. Just my two cents worth.
Mark S. Rzeszotarski, Ph.D.