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Old 2nd September 2010, 07:43 PM   #531
Tea-Bag is offline Tea-Bag  United States
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sorry, the ground connection between v+ and v- all in that place.
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Old 2nd September 2010, 08:50 PM   #532
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sorry, the ground connection between v+ and v- all in that place.
And is there an elegant way of performing it? I am afraid the only solution to be a bunch of flying cables soldered to a copper jumper. That couldn't be an option with such a nice board

Can you post a picture of yours?
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Old 2nd September 2010, 10:47 PM   #533
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I will look for a pic, but that's the way I do it. Not sure where I picked it up.
I think someone from Poland had drawn it out for me that way.
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Old 3rd September 2010, 12:59 AM   #534
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Peter shows lots of pictures in the Universal Power Supply thread in the Vendor Forums (under Audio Sector) that should explain everything. Postings #4 and #32 in particular may be of interest to Regiregi22's query.
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Old 3rd September 2010, 03:56 PM   #535
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Peter shows lots of pictures in the Universal Power Supply thread in the Vendor Forums (under Audio Sector) that should explain everything. Postings #4 and #32 in particular may be of interest to Regiregi22's query.
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Old 13th September 2010, 06:11 PM   #536
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I haven't yet found an elegant way to hook up grounds. Its a pity doing that way having so many holes on the PSU board.

On another matter, I've seen that the recommended transformers are around 250VA or 300VA ratings. I know these are recommended values for long term stability, lower heat, constant current class A consumption, bla bla bla...
But in practice, if my maths are right, one F5 channel would consume 1.3A times 36v (2x18vac voltage swing), which is around 47VA.
Now my question is not wether is it recommended a 47VA trafo (I know it isn't), but if one F5 channel just consumes 47VA.
Does one F5 channel needs just 47VA?
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Old 13th September 2010, 06:36 PM   #537
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47VA, no.
Because the transformer does not see/feel/react to/heat up the same as it would do passing 1.3Aac through a resistor.
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Old 13th September 2010, 09:50 PM   #538
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thanks

It has something to be with the inductance, or because of the lower resistance than a transformer coil use to have comparing it with a resistor?

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Regi
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Old 15th September 2010, 10:58 AM   #539
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Is it OK one slow-blow 1.25A fuse to protect one F5? I am going dual psu for it, but Nelson Pass psu schematic doesn't specify if it is for one channel or two. I live in 230v. I will use the thermistors in the transformer.
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Old 15th September 2010, 11:15 AM   #540
AndrewT is offline AndrewT  Scotland
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It has something to be with the inductance, or because of the lower resistance than a transformer coil use to have comparing it with a resistor?
it's mainly due to the heating effect in the primary and the secondary depending on I^2 rather than simply I.
The current pulses that charge up a capacitor input filter demand that the transformer be de-rated according to the manufacturer's data.
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