Re: Secondary Specs
Subject: Re: Secondary Specs
Date: Wed, 16 Apr 1997 20:27:57 -0700
From: "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
To: "Tesla List" <tesla-at-pupman-dot-com>
Suggest 4 inch dia. SDR (sewer & drain) from plumbing supply store with
length of 32 inches. Wind with #28 AWG polythermalize (200 degree C.).
Start winding 3 inches from bottom and terminate 1 inch from top. Total
winding length is 28 inches. Use .005 MFD cap with 30 ma xmfr and fixed
sparkgap with 4-5 gaps. Use muffin fan to blow 150 - 200 CFM air
sparkgap. Terminate with 12 x 3 toroid. Primary is 32 turns 1/2 copper
strap (or 10 AWG house wiring). Tap primary as necessary for best
If available use 60 ma. xmfr with .01 MFD cap for best performance. 34
inch spark with this xmfr and 22-24 inch spark with 30 ma xmfr.
> Phil Chalk wrote:
> I am about to build my _first_ coil. Initially it will be powered by a
> 12kV 30mA Neon, but I'd like to build a coil capable of coping with
> whatever other bigger transformers I might get lucky enough to come
> across for a while.
> So at this stage I'm thinking of a 10" diameter secondary, on some
> 'nice' plastic, not PVC. I'd like to wind it with about #18 or even #16
> wire. #18 gives about 34" winding length for 800 turns & about 42" for
> 1000 turns, close-wound.
> I haven't given the primary much thought yet - probably about 1/4" -
> 1/2" copper tube (What's the advantage of 'conical' primaries ?)
> So I just wanted to draw on the pool of knowledge & experience here, &
> see what comments anyone has about my suggested dimensions, etc, before
> I go and spend the bucks !