Message-ID: <C07C8236090045D29B5F672A744F81BE@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <1456380282.20170524154713@gmail.com> <5925A16B.7050100@posteo.de> <48702557.20170525114046@gmail.com> <5926C96B.7050206@posteo.de>
In-Reply-To: <5926C96B.7050206@posteo.de>
Date: Fri, 26 May 2017 22:21:04 +0100
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Subject: Re: LF: Iron dust toroids and heating/H bridge 
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Stefan

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,
G0NBD

--------------------------------------------------
From: "DK7FC" <selberdenken@posteo.de>
Sent: Thursday, May 25, 2017 1:09 PM
To: <rsgb_lf_group@blacksheep.org>
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 
> https://www.spulen.com/hf-litze-250-x-0-1-mm-100-g-spule.html and 
> WIMA-FKP-1 capacitors, the 2 kV version...
>
> Good luck and fun with your projects.
>
> 73, Stefan
> 

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