----- Original Message -----
From: "J. B. Weazle McCreath" <[email protected]>
To: <[email protected]>
Sent: Monday, October 24, 2005 11:01 PM
Subject: LF: Toroid winding question
Hello LFers,
How critical is the spacing between the windings and the core material
when
winding a toroidal transformer? I have a core taken from a television
flyback
transformer that I'd like to experiment with using different winding
techniques.
To simplify things, I was thinking of putting the windings onto bobbins
that
could quickly be slipped on and off of the core. Would I be OK with using
a bobbin with 1/8 inch (3 mm) wall thickness or should I look for
something
with a thinner wall? Any and all comments welcome.
73, J.B., VE3EAR - VE3WZL
Solar and wind powered
EN93dr
I use these cores, which are mostly 3C material, some are marked. My
approach, keep the two halves of the core as tight together as possible, no
gap, then wind around the whole perimiter firstly with the winding that
requires most turns and over wind this with the heavier guage winding of
least turns eg
This method is not as convenient as using two bobbins one for prim and one
for sec but it works well, distribute the turns equally on each of the 4
sides and keep the same sense for both windings.
The two halves need to be tightly clamped with a metal bracket, use the
original bracked that comes with the transformer. I tried using plastic ties
but you cannot get these tight enough.
73 de Mal/G3KEV
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