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Re: Homemade Rolled Caps
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To: tesla@grendel.objinc.com, KLINEDA@univscvm.csd.scarolina.edu, Pyrofish@aol.com, WMEYER@scientia.up.ac.za, bhaley@shore.net, brad.alheim@the-spa.com, coco@astroman.com, djz@dana.ucc.nau.edu, frerichs@zfe.siemens.de, froula@cig.mot.com, haba@snakemail.hut.fi
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Subject: Re: Homemade Rolled Caps
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From: Esondrmn@aol.com
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Date: Tue, 27 Feb 1996 16:48:13 -0500
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In a message dated 96-02-27 12:23:45 EST, tesla@grendel.objinc.com writes:
>
>I didn't make a clean room, but I did set up a special 8 foot long work
>bench for assembly. All aluminum flashing edges were sanded down smooth,
>and afterwards both aluminum and plastic got wiped down thoroughly before
>assembly. No carpet fibers, hair or small children got rolled up.
>
>I am going to tear down all my failed poly caps and rebuild them into a flat
>plate capacitor. I'm going to mount the plates in a pole pig housing that I
>just gutted. I'm going to to use multiple sheets of poly to make 120 mil
>dielectric, and I'm assembling it under oil, sheet by sheet, to eliminate
>air pockets. This will be the last poly cap I build - I'm going to buy
>commercial caps from that point forward.
>
>Bert
>
>
Bert,
When I built mine, I also was very careful. Sanded all the edges, cleaned
all the materials, layed everything out on clean paper, etc. - but they still
failed. Possibly the problem is with the dielectric and scratches,
imperfections, etc. If someone was planning to build a home made rolled cap
I would certainly reccommend two layers of .030 poly instead of one .062
layer. Three layers of .030 would be best, of course the capacitance
produced would be less.
Ed Sonderman