Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?

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Subject:	Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?
From:	Andy Talbot <[email protected]>
Date:	Sat, 31 Oct 2015 18:40:35 +0000
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Not too many turns, copper losses can become significant.

Use the oft quoted formula on this Group

Vrms = 4.44.F.N.A.B (All SI units)

Keep B below 0.1 Tesla, 0.08T is ample

Andy G4JNT

On 31 October 2015 at 18:30, Clemens Paul <[email protected]> wrote:

Hi Chris,

>I have a 3C90 core spare and will wind a 1 :
>1 transformer for now, just for isolation. How many turns should I use
>for best efficiency?

It's primarily not a matter of efficieny but of flux density in the core
(->heating ,saturation)
What is the size of the core and your power level?
Generally I would wind as much turns as feasible on the core to keep flux as low as possible.
For best efficiency and low stray inductance tight coupling of the primary and secondary winding is essential.

73
Clemens
DL4RAJ

>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Saturday, October 31, 2015 1:16 PM
>To: Mike Dennison
>Subject: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?
>

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LF: Zmag of 45.6 Ohms OK, or should I try for better?, Chris Wilson LF: RE: Zmag of 45.6 Ohms OK, or should I try for better?, Rik Strobbe Re: LF: RE: Zmag of 45.6 Ohms OK, or should I try for better?, Chris Wilson LF: RE: Zmag of 45.6 Ohms OK, or should I try for better?, Clemens Paul Re: LF: Zmag of 45.6 Ohms OK, or should I try for better?, DK7FC Re: LF: Zmag of 45.6 Ohms OK, or should I try for better?, Mike Dennison Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?, Chris Wilson RE: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?, Clemens Paul Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better?, Andy Talbot <=

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