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How do I make my HV chokes?
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To: "'Tesla List'" <tesla@pupman.com>
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Subject: How do I make my HV chokes?
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From: Tesla List <tesla@stic.net>
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Date: Fri, 20 Feb 1998 08:01:42 -0600
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Approved: tesla@stic.net
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From: Greg Leyh [SMTP:lod@pacbell.net]
Sent: Thursday, February 19, 1998 4:25 PM
To: Tesla List
Subject: Re: How do I make my HV chokes?
Gary Lau wrote:
> I have seen advice advocating L-and/or-R-only protection networks posted
> to this list many times but have not seen any rationale for using these
> configurations beyond anecdotal "I've been using this and had no failures
> yet". Can anyone defend series-only protection networks in a more
> analytical manor?
Although the NST HV winding does have a large L,
it also has a significant parasitic shunt capacitance,
on the order of hundreds of picofarads.
Perhaps these series LR schemes work against this
shunt capacitance to form an LC low-pass. The R
may be needed to keep the filter from self-resonating
if the NST's self-C is not lossy enough.
On my coils I employ a L-diode filter, so that
self-resonance in the filter is not an issue.
The L-diode filter also provides significantly
higher RF rejection than a standard L-C filter.
-GL