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Re: 1600 turns

Original poster: "Dave Larkin by way of Terry Fritz <twftesla-at-qwest-dot-net>" <teslaman15-at-hotmail-dot-com>

Hi Godfrey

Jeez...  I thought we'd left this 'magic turns count' thing behind along 
with glass capacitors and carboard coilforms!  Turns count should not be a 
primary design parameter.  Resonant frequency (as low as possible) and Zout 
(~ 40k is about right for a coil of this scale) should be the primary design 
considerations, although imho the size of former and guage of wire you 
happen to have on hand are every bit as valid!

Traditionally one advantage of a higher turn count, higher inductance, 
secondary is that is forces one to use a primary with more turns, hence a 
higher primary Zsurge and reduced gap losses.  This can also be achieved by 
using a higher input voltage, but for reaons of practicallity most people 
operate below 15kV.  John Freau has been a leading exponent of the 'high 
turns count' school of design -



>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: 1600 turns
>Date: Wed, 29 May 2002 23:13:18 -0600
>Original poster: "Loudner, Godfrey by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
>I removed a tube from a machine that makes distilled water. The tube specs
>are 24" long, 4 & 15/16" outside diameter, 1/8" thick wall, open at each
>end, and made of white, translucent plastic. I'm thinking about making a
>1600 turn tesla coil secondary using #28 magnet wire. The flat primary will
>be made with 1/4" soft copper refrigeration tubing. Can someone tell me 
>are the advantages of the 1600 turn thing over the classic 1000 turns? With
>a 10 LB spool of #28 wire and the tube on hand, I might as well go ahead.
>What is the maximum kVA transformer I should use in the power supply?
>Godfrey Loudner