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Old 19th August 2012, 04:03 AM   #251
ChrisA is offline ChrisA  United States
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Quote:
Originally Posted by Tony View Post
have you seen the book posted at YvesM's website, is it different from yours? http://www.dissident-audio.com/Trans...ign_Manual.pdf

Your link did not work but i was able to find the book I have on that site. The link below is the same book I have. Except I OCR'd my copy to make it searchable. This book is good and it answers most of the questions that come up in these forums. The other one to get a "Radiotron" 4th ed. on Pete Millet's web site. The section on transformers is good.

http://www.dissident-audio.com/Trans...ign_Manual.pdf
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Old 19th August 2012, 09:26 AM   #252
Junie is offline Junie  Philippines
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Default Winding my own trafo

Hi to all.
Buying a new trafo is expensive, since i have two stepdown(220->110) I'm planning to build my own with the below spec:

Input: 220V/50Hz
Output: 45VAC centertap
18VAC centertap
VA: as per the label it's 1000VA


Now with your help please let me know the following:
  • Primary winding(turns)
  • Secondary windings(turns)
  • Primary wire gauge
  • Secondary wire gauge
I really appreciate for any help you can extend. many thanks in advance.
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Old 19th August 2012, 10:30 AM   #253
AJT is offline AJT  Philippines
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how thick is your stack? even though you have traffo rated 1000voltamps it doesn't mean you will get the same rating....more so if that traffo was auto-transformer type...induction type traffos will be bigger for the same spec....
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Old 19th August 2012, 11:05 AM   #254
Junie is offline Junie  Philippines
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Sir Tony it's 0.5mm, I'm planning to use the trafo for Leach amp with 10 O/P tranny. Thanks.
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Old 19th August 2012, 11:19 AM   #255
AndrewT is offline AndrewT  Scotland
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How thick is your stack?
That is the measurement between the bell ends on your pic.
It looks like ~~50mm

2000VA auto transformer could be as little as 200VA and for a 220:110 about 1000VA
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Old 19th August 2012, 11:28 AM   #256
Junie is offline Junie  Philippines
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AndrewT(not going to use Andy at all, sorry for that) i have two trafo:
  • 1500VA-Stack size: 51mm
  • 2000VA-Stack size: 60mm
E core thickness: 0.5mm

Last edited by Junie; 19th August 2012 at 11:31 AM. Reason: wrong name
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Old 19th August 2012, 11:58 AM   #257
AndrewT is offline AndrewT  Scotland
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42 * 51mm = 2142mm˛ = 3.32sq in of core area.
VA ~ 31 * Core area˛ ~ 31 *3.32*3.32 ~ 340VA for the smaller stack and ~ [60/51]˛ higher for the bigger stack i.e. ~ 470VA.
Certainly not 1000VA.
If you added the two stacks together (not ideal because the stack shape is 42*111= very non square) you could get ~~ 1.6kVA. But there would be relatively small window area for sufficient copper to keep the resistances low.

87mm stack gives ~1kVA
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Last edited by AndrewT; 19th August 2012 at 12:01 PM.
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Old 19th August 2012, 12:36 PM   #258
Junie is offline Junie  Philippines
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AndrewT if it will yeild me to higher VA I will combine the two trafo as it has the same Size EI core.
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Old 19th August 2012, 01:00 PM   #259
AndrewT is offline AndrewT  Scotland
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Tony, if willing, can give you good and accurate build advice.

Do you really need 1000VA for your intended duty?
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Old 19th August 2012, 01:06 PM   #260
Junie is offline Junie  Philippines
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Well for Leach Amp with 10 OP is 1000VA too much? I mean in Stereo.

Will wait for Sir Tony's reply then.
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