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Old 19th November 2010, 05:54 PM   #581
EUVL is offline EUVL  Europe
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Interest in SumR 500VA 2x15V Transformer for F5X (ca. 100USD per Tx):

The Team 4 +
AndrewT 2
.....
.....

Please fill in accordingly.


Patrick

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Last edited by EUVL; 19th November 2010 at 05:59 PM.
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Old 19th November 2010, 07:48 PM   #582
Horio is offline Horio  United States
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Interest in SumR 500VA 2x15V Transformer for F5X (ca. 100USD per Tx):

The Team 4 +
AndrewT 2
Horio 2
.....
.....

Please fill in accordingly.


Patrick

Last edited by Horio; 19th November 2010 at 08:05 PM.
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Old 19th November 2010, 07:54 PM   #583
EUVL is offline EUVL  Europe
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Pls note that 1x 500VA will be sufficient for 1 channel F5X only or 2 channel F5 standard.
Price indication only and not including postage.

Patrick
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Old 19th November 2010, 08:06 PM   #584
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Quote:
Originally Posted by EUVL View Post
Pls note that 1x 500VA will be sufficient for 1 channel F5X only or 2 channel F5 standard.
Price indication only and not including postage.

Patrick
I was wondering about that. 500VA seemed low for 2 channels.

Thanks Patrick.
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Old 20th November 2010, 02:14 AM   #585
pchw is online now pchw  United States
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The Team 4 +
AndrewT 2
Horio 2
pchw 2
.....
.....
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Old 20th November 2010, 02:53 AM   #586
EUVL is offline EUVL  Europe
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So we'll go and ask for 10 pieces.

I think that'll do for the first round. Some discount.
Not too much GB effort to divert the team from development work.


Patrick
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Old 20th November 2010, 05:39 AM   #587
EUVL is offline EUVL  Europe
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For those who wants to support their local industry, here is an exemplary specification.


Patrick
Attached Files
File Type: pdf Toroidal Transformer 500VA 2x15Vac F5X Mono.pdf (40.6 KB, 537 views)
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Old 20th November 2010, 07:22 AM   #588
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Thanks for the specs.
I will get a quote from harbuch
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Old 20th November 2010, 09:05 AM   #589
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Please pardon my ignorance here, still catching up on the thread - why is a 500VA, 16A txr required for each channel?
If custom made, would 2 X 300, 400, etc VA units or one larger single unit, if space permits, do the job?

I generally use the EI core trannies, but are much larger (and expensive) than the T's.
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Old 20th November 2010, 09:28 AM   #590
EUVL is offline EUVL  Europe
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Total dissipation per channel is 128W. Dropout loss in regulator or CRC 24W. Diode loss 16W. Min power requirement per channel = 168W. Factor of 3 to allow for high ripple current of Class A amp (see NP articles) = 504VA. Actually 0.8% undersized.

http://www.firstwatt.com/pdf/art_power_supplies.pdf

Case design has 350mm overall width. Conrad heatsinks 2x48mm. Some room for PCBs, wiring, etc, 2x50mm. Maximum width (diameter) of Tx = 154mm. Fits most commercially available 500VA Tx with about 5mm space left both sides.

Of course you can make your own decisions. That's why I said exemplary.


Patrick

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Last edited by EUVL; 20th November 2010 at 09:39 AM.
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