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Re: [Amps] Amplifier power supply?

To: Ian White GM3SEK <>
Subject: Re: [Amps] Amplifier power supply?
Date: Sat, 14 Jul 2007 07:39:53 -0400 (EDT)
List-post: <>
No problemm; that is how it is done.  The more core, more flux.  Your 
essentially just making a bigger piece of permeable material.

I'd individually wrap the cores in Teflon tape (what plumbers use for leaks), 
and then wrap them together with Teflon tape, then wrap wire.  Some use 
fiberglass, but Teflon tape works too.

I made a 1:4 ferrite transformer balun to feed my 160m delta loop back in '95 
after I installed my tower.  The balun (without teflon tape) arced after a few 
tries with the amp, and melted the wire and core.  I took the balun apart, 
re-wrapped with teflon tape, used the same cores, and never a problem since.


Steve, K0SF

----- Original Message -----
From: "Ian White GM3SEK" <>
Sent: Saturday, July 14, 2007 6:20:45 AM (GMT-0600) America/Chicago
Subject: Re: [Amps] Amplifier power supply?

Andy wrote:

>I have two toroid transformers, both the same spec and rating, I want to
>double them up, i.e. parallel on the primary, 240v supply, and series the
>secondary windings. That in itself seems straight forward, but I also want
>to sit one toroid on top of the other, is there any reason that I can't see
>that I couldn't do this?
Hi Andy

Can't see why not. Being toroidal transformers, the magnetic fields 
should be entirely contained within each individual transformer. Also, 
you'd probably want to space them a little way apart anyway, so some air 
can circulate between them.


73 from Ian GM3SEK
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