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Transformer for F5 - 1 or 2 secondaries?
Transformer for F5 - 1 or 2 secondaries?
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Old 6th August 2019, 06:03 AM   #11
Staka is offline Staka  Croatia
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Last one question, I saw recommendations for bifilar winding of the transformer, does that make sense?
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Old 9th August 2019, 12:02 PM   #12
astromo is offline astromo  Australia
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Quote:
Originally Posted by Staka View Post
Last one question, I saw recommendations for bifilar winding of the transformer, does that make sense?
News to me. Happy to learn something new.

You may want to think about electrostatic shielding (involves its own earth/ground cable) and other noise mitigation options like GOSS banding.
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Old 9th August 2019, 10:19 PM   #13
DougL is online now DougL  United States
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Quote:
bifilar winding of the transformer
Bifilar winding is a technique that tends to make the secondary windings match closely to each other. Having a close match is never a bad thing.
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Old 10th August 2019, 03:27 AM   #14
rjm121012 is offline rjm121012
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You doing a F5 or a F5 Turbo?
For a F5 Turbo you will want a transformer with a dual 24V output or a center tapped 48V output. Both the same. When doing a search on Digikey or Mouser you may get different results depending on output selection. No matter if doing mono block or stereo chassis you will need same type transformer. Only VA rating will change. I see no reason for doing mono blocks on a F5 except for "Bling factor". Additional chassis, transformer, filter caps, etc, etc.
Sometimes a larger rated transformer may be cheaper depending on availability.
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Old 10th August 2019, 02:48 PM   #15
Staka is offline Staka  Croatia
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Quote:
Originally Posted by rjm121012 View Post
You doing a F5 or a F5 Turbo?
For a F5 Turbo you will want a transformer with a dual 24V output or a center tapped 48V output. Both the same. When doing a search on Digikey or Mouser you may get different results depending on output selection. No matter if doing mono block or stereo chassis you will need same type transformer. Only VA rating will change. I see no reason for doing mono blocks on a F5 except for "Bling factor". Additional chassis, transformer, filter caps, etc, etc.
Sometimes a larger rated transformer may be cheaper depending on availability.
I building an ordinary F5 , I gave up from monoblocks, I was thinking of going for dual mono because I thought it was a bigger difference in sound quality, I didn't need more than 25w per channel so I will stay on stereo. I'm in the dilemma of choosing a transformer, a lot of people here use a high power transformers (500,600,800 VA), some even calculate that 500 is optimal for a regular F5 ... I can get a custom transformer at a reasonable price in my city, I just don't know how strong to choose. I have read that transformers of higher power than 300VA have problems with DC from the powerline and that worries me...
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Old 10th August 2019, 03:23 PM   #16
Zen Mod is online now Zen Mod  Serbia
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Transformer for F5 - 1 or 2 secondaries?
use 2 pcs of 250VA and make dual mono in one case

take a look at my builds - either blog in my sig or here - latest examples in SissySIT and Babelfish M25 threads
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Old 10th August 2019, 08:34 PM   #17
McQuaide is offline McQuaide  United States
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One 400VA is fine.
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Old 11th August 2019, 07:52 PM   #18
Staka is offline Staka  Croatia
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Quote:
Originally Posted by Zen Mod View Post
use 2 pcs of 250VA and make dual mono in one case

take a look at my builds - either blog in my sig or here - latest examples in SissySIT and Babelfish M25 threads
I looked at your blog you have great builds!, you already answered me once about Toshiba jfet (I remember Pipi avatar) and I didn't notice so far that you are from Serbia, may I send you a mail with a few questions?
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Old 11th August 2019, 08:28 PM   #19
Zen Mod is online now Zen Mod  Serbia
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Transformer for F5 - 1 or 2 secondaries?
yup

>zenmodiyaudio@gmail.com<

though , as always is case with me - if I'm not answering on e-mail or PM , feel free to repeat the same
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Old 13th August 2019, 03:34 PM   #20
koja is offline koja  Canada
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I made a regulated PS for my F5 as per Nelson's Zen 5 paper:
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