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Re: LF: Iron dust toroids and heating/H bridge

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Subject: Re: LF: Iron dust toroids and heating/H bridge
From: "Graham" <[email protected]>
Date: Fri, 26 May 2017 22:21:04 +0100
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I now have the  cct's tnx  .

The H bridge seems a interesting design, one point , the amp is on frequency , F in = F out ? in which case , solves the problems linked to data ...
Composite driver  IC's  are available  for  the  H configuration,

Have  you looked at these ? ?,

would seem to simplify construction , to a single out put transformer , whilst producing less harmonic power ... ?
Tnx -G,

From: "DK7FC" <[email protected]>
Sent: Thursday, May 25, 2017 1:09 PM
To: <[email protected]>
Subject: Re: LF: Iron dust toroids and heating

Hi Chris,

Am 25.05.2017 12:40, schrieb Chris Wilson:
I was wondering if the #3 material which is rated for use from 0.05 to
0.5 MHz, and has several times the permeability would be a better
choice for more power through it? It probably gives a higher Q with
fewer turns, allowing the use of larger wire without having
overlapping layers in the winding?

Yes that sounds like a good concept.

It is interesting to follow your plans. Actuelly i would like to try to build a 2.5 kW or larger PA as well, just for interest of course. I would of course use it together with a dummy load only, because you must not radiate more than 1 W here in DL, and i am a conformist and under the spell of authorities (german: autoritätshörig) :-) It would be interesting to deal with the problems that would appear with such PAs. For say 3 kW and the comfortable situation to have a suitable 60 V power supply, i would simply build a current mode class D PA, hard keyed with an IXDD614CI and 2x 4x IRFP260N FETs. For the LPF i would use the T225A-2 together with RF litz wire, maybe 250x0.1mm, available at and WIMA-FKP-1 capacitors, the 2 kV version...
Good luck and fun with your projects.

73, Stefan

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