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Re: LF: Stacking toroids

To: <[email protected]>
Subject: Re: LF: Stacking toroids
From: John Fisher <[email protected]>
Date: Mon, 27 Mar 2017 13:30:28 +0000 (UTC)
Cc: <[email protected]>
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References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi Jay,

Can you recommend a way to compensate for the doubled inductance?

Also, I'd be interested in two driver boards if you get more made.


On Sat, 3/25/17, [email protected] <[email protected]> wrote:

 Subject: Re: LF: Stacking toroids
 To: "[email protected]" <[email protected]>
 Received: Saturday, March 25, 2017, 7:32 PM
 Your original post describes the core as
 "warmish" after a WSPR session ... maybe some
 clarification of what temperature "warmish" is
 would be helpful. A core that runs 'warm' should not
 be cause for great concern ... most core materials can
 tolerate even moderate heating just fine. 'Hot',
 on the other hand, would of course be another matter. As
 pointed out in an earlier post, some of the heating may be
 from losses in the copper windings.
 One disadvantage to stacking cores (keeping the same
 number of turns) is that the winding inductance doubles
 from the original design. This will likely increase the
 leakage inductance ... one negative effect being an increase
 in switching transient ringing.  
 p.s. I'm looking into getting more driver boards
 made ...

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