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Re: Helping someone with broken coil (fwd)
It's radius vs. diameter. :-)
---------- Forwarded message ----------
Date: Tue, 21 Aug 2007 22:14:46 -0500
From: Drake Schutt <drake89@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Helping someone with broken coil (fwd)
Chip how is the primary (4.5") smaller in diameter than the secondary (7")?
On 8/21/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> ---------- Forwarded message ----------
> Date: Tue, 21 Aug 2007 20:09:45 -0600 (MDT)
> From: Chip Atkinson <chip@xxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Helping someone with broken coil
> I was contacted recently by a guy who has a display coil The capacitor
> blew up and he would like to get the thing running again. Unfortunately
> he was unable to get any specs from the cap so I'm kind of winging it.
> His secondary looks to be 7" in diameter and 22" long. The coil is
> powered by a 15kV/120ma transformer (nst?) and the primary has 10 turns
> with 4.5" inner radius and 13.5" outer radius.
> My question is what is a good capacitor value replacement? I figure one
> rated for 45kV, but what capacity? What have others used on coils of
> approximately this size? My guess is 0.020-0.025uF. Worth noting is that
> 0.021 uF is a resonant capacitor so it should probably be avoided.
> Thanks in advance.