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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+RE\:\s+Combining\s+LF\s+amps\s+revisited\s*$/: 6 ]

Total 6 documents matching your query.

1. LF: RE: Combining LF amps revisited (score: 1)
Author: "Clemens Paul" <[email protected]>
Date: Sat, 13 May 2017 15:34:32 +0200
Hi Chris, I have a tool by DJ5IL here which predicts around 60°C for the cores (excluding heat caused by the winding) and ca. 480 Gauss flux density. 73 Clemens DL4RAJ Attachment: 3xFT240-77_137kHZ.J
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00138.html (12,861 bytes)

2. Re: LF: RE: Combining LF amps revisited (score: 1)
Author: Chris Wilson <[email protected]>
Date: Mon, 15 May 2017 11:59:15 +0100
Hello Clemens, Thanks for the reply, the 3 stacked cores will rise to 70 degrees C plus even with a small computer processor fan blowing through them. I am investigating ways of reducing this, the co
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00146.html (10,378 bytes)

3. Re: LF: RE: Combining LF amps revisited (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 15 May 2017 13:42:36 +0100
For transformers the core is not terribly critical provided you use a grade of ferrite designed for the frequency of interest.  And at LF that means SMPSU cores If I see a certain size core being use
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00147.html (12,277 bytes)

4. Re: LF: RE: Combining LF amps revisited (score: 1)
Author: Chris Wilson <[email protected]>
Date: Tue, 16 May 2017 16:45:56 +0100
Hello Andy, Thanks, I seem to have had some success using 3 X the number of turns and changing from 77 compound to 79 compound. I think I follow your formulae, as I say, maths is my very weakest poin
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00153.html (10,963 bytes)

5. LF: RE: Combining LF amps revisited (score: 1)
Author: "Clemens Paul" <[email protected]>
Date: Sun, 21 May 2017 09:51:52 +0200
Hi Marco & Chris apologies for the delayed reply. There was indeed a typo. It should heave read 12.5Ohm because the amp is designed to work into a 50:4=12.5 Ohm load. Then there was another wrong ent
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00169.html (13,514 bytes)

6. Re: LF: RE: Combining LF amps revisited (score: 1)
Author: Chris Wilson <[email protected]>
Date: Mon, 22 May 2017 10:10:28 +0100
Hello Clemens, Thanks for the corrections, I did struggle a bit to get sensible results, but put it down to user error :) No worries! I have built a new combiner transformer on 3 off 78 material stac
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00171.html (10,932 bytes)


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