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Old 18th November 2007, 11:07 AM   #201
EUVL is offline EUVL  Europe
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> 300 VA ?? Will 500 VA be harmful ??

Refer to the First Watt schematics. Supply is +/-24V. Total bias is about 2A. That would make about 100W continuous draw. So 300VA would be sufficient.

However, should you wish to upgrade later to an AJ-X, then 500VA (or 600VA) would fit the bill perfectly.

The price difference between the two is less than 1.5x.


Patrick
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Old 18th November 2007, 05:41 PM   #202
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Not quite sure how this could happen, but it seems I somehow managed to screw up the transistor pinouts on the biploar parts and the 2SJ. Here's the corrected board:

Click the image to open in full size.

Bottom layer pdf: http://www.hb001.de/alephjpcbbottom_rc9.pdf
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Old 18th November 2007, 10:08 PM   #203
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Quote:
Originally posted by Babowana
Yes, but harmful only for your money pocket.
Quote:
Originally posted by EUVL
Refer to the First Watt schematics. Supply is +/-24V. Total bias is about 2A. That would make about 100W continuous draw. So 300VA would be sufficient.

However, should you wish to upgrade later to an AJ-X, then 500VA (or 600VA) would fit the bill perfectly.

The price difference between the two is less than 1.5x.


Some might think there will be problems with the rectifier diodes and,
the more, a larger trannie could cause higher ripple to the DC voltage.

I tend to larger ones. That's why I ask...
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Old 18th November 2007, 11:06 PM   #204
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Quote:
Originally posted by HBarske
Not quite sure how this could happen, but it seems I somehow managed to screw up the transistor pinouts on the biploar parts and the 2SJ.
You're not alone Holger. That even happens in the industry, when you give the final OK for a 1000pcs. batch of PCBs to the boardhouse only to discover you mangled some part's, or more typically, some connector's pinout (happend to me). That's why we need so many "soldering students", at times


Quote:
Originally posted by ticktock
Some might think there will be problems with the rectifier diodes and,
the more, a larger trannie could cause higher ripple to the DC voltage.

I tend to larger ones. That's why I ask...
Hi
I would tend to build the bigger supply, as an X-version surely is an option... Only consider that the voltage output would be a little hihger, but given the allowed (>=2008) 195V...265V mains AC span, this is another can of worms...

- Klaus
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Old 19th November 2007, 12:55 AM   #205
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Hello Klaus,

nett, da▀ Du auch hier bist

I know You prefer the XA and Aleph X, maybe I will build one sometime.
But not sure at all.

Are You sure of the voltage span? Never heard of something like that.
Actually we have exactly 230 V.

For this (195V...265V mains AC span) You'd need a smps . . . .
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Old 19th November 2007, 11:13 AM   #206
EUVL is offline EUVL  Europe
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> Are You sure of the voltage span? Never heard of something like that. Actually we have exactly 230 V.

The AC Voltage from the wall is allowed to vary to a certain tolerance to regulate load on the network, but I would not expect more than 10% in most cases. In the U.K., the electricity suppliers deliberately put it on the high side (220V nom, ~240V actual) so that they can sell more electricity (most equipment consumes more as the input voltage is increased).

> a larger trannie could cause higher ripple to the DC voltage.

Can you offer a scientific explanation ?


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Old 19th November 2007, 11:35 AM   #207
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Quote:
Originally posted by EUVL
220V nom, ~240V actual
The true reason may very well be that the Brits are still reluctant to join the "continent", the nominal mains level in the UK used to be 240VAC.
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Old 19th November 2007, 01:26 PM   #208
EUVL is offline EUVL  Europe
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> the nominal mains level in the UK used to be 240VAC

Not as far as my memory goes, Meneer Vermeulen.
Has always been 220V.


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Old 19th November 2007, 02:01 PM   #209
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English never was my strong point :
beepedebeep
blib
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Old 19th November 2007, 03:38 PM   #210
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As everyone knows the official mains voltage was 220V in Europe and 240V in England - now the nominal voltage is 235V on both sides.
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