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Date: Thu, 20 Nov 2008 16:44:35 +0000
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Re: 3C85/90 Toroids
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Yes that's correct. The Txxx is a size designation, -2 is iron powder
mix 2, suited for MF to low HF.

For SMPSU / LF transformers Siemens N80 material is a substitute for
3C85 / 3C90.(hope I've remembered the No. correctly !)

Andy  G4JNT
www.scrbg.org/g4jnt



2008/11/20 Paul-Henrik <phl@netikka.fi>:
> I forgot to mention one important thing in my last reply:
>
> From the earlier discussions on this subject I got the impression that T130-3
> and T200-2 cores were suggested as alternatives to the 3C85/3C90.
>
> The mixes #2 and #3 are powder iron, not ferrite as the 3F3 and 3C85/3C90. I
> beleive they are poorly suited as power transformers on LF/MF but make good
> inductors for low-pass filters on 136 and 500kHz. This is true at least for the
> #2 mix. On 500kHz I remember seeing reports of severe LPF heating with the #3
> mix, I will have to check again on that.
>
> Some of the gurus please correct me if I'm wrong here. I just wanted to press
> the "pause and think again" button before someone possibly orders inductor
> cores to use for a transformer.
>
> I'm still a beginner/learner in this game, the above is just how I see things
> today.
>
> 73's
>
> Paul-Henrik
>
>
> Quoting "Johan H. Bodin" <jh.bodin@telia.com>:
>
>> Yes, 3F3 is even better than 3C85/3C90 for power transformation at a few
>> hundred
>> kHz. The 3F3 cores, if coloured, are light blue. Philips sold their ferrite
>> business to Ferroxcube: http://www.ferroxcube.com/
>>
>> 73
>> Johan SM6LKM
>>
>>
>> Paul-Henrik wrote:
>> > Have a look at Ferroxcube (Philips) cores of 3F3 material. As far as I can
>> > interpret datasheets for these, they should work fairly well as
>> transformers up
>> > to 500kHz with a DC component and up to 1MHz without DC.
>>
>>
>
>
>
>
>
>
>
>