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Old 28th November 2001, 07:42 PM   #21
paulb is offline paulb  Canada
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After Nelson Pass announced that passdiy.com will be up soon, I looked at the Aleph 3 again. Turns out my transformer provides the right rails but I think its VA is a big light.
The Aleph 3 draws about 2 amps per channel = 100 watts, or 200 watts total. I think the transformer should therefore be 400 VA.
Meanwhile, mine is just 288VA. What happens if I tweak the current down to (say) 1.44 amps per channel? Will the sun go supernova?
Starting the hunt now for large surplus computer grade caps...
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Old 28th November 2001, 07:56 PM   #22
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paulb,

Is your transformer getting hot, after an hour or so?
Is there a large voltage drop between load and noload condition in your supply?

If you can answer no to both questions, your transformer should be OK for ALEPH3.
However I am using a 500VA tranny for my ALEPH3, almost no drop, very cool running. So if you can pick up a larger tranny it will be perfect.

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Old 29th November 2001, 12:58 AM   #23
paulb is offline paulb  Canada
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He he, thanks but I haven't built the thing yet. I'm going to choose the amp design around the transformer I have because they're so expensive. And I'm cheap. And the power supply is already built, and I'm lazy, too.
I'll be biamping or triamping, so I don't need a whole lot of power. My assumption is that 288VA is not enough (for 30W per channel!) so I'm thinking about reducing the bias current by about 25% and living with less power output.
If, when I build this, the transformer gets hot I guess I'll reduce it some more.
My assumption is that you need a transformer of twice the VA as the DC power required.
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Old 29th November 2001, 02:34 AM   #24
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Paul,
why not get another similar transformer and built a monobloc out of it? The original Aleph 3 looks cute as a monobloc.

all passfans out there....what we've been waiting for "Coming in early December 2001" check out http://www.passdiy.com


[Edited by cp642 on 11-28-2001 at 10:01 PM]
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Old 29th November 2001, 05:32 AM   #25
paulb is offline paulb  Canada
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Quote:
Originally posted by cp642
Paul,
why not get another similar transformer and built a monobloc out of it?
You missed the part where I said I'm cheap. I can make do with half the power.
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Old 27th December 2001, 10:23 PM   #26
pa is offline pa
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Question Mini-Aleph some news ?

Hi !
Mini aleph is a very intersting project for biamp and 5.1 HomeCinema systems..
Anyone has some news ?
Pa
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Old 28th December 2001, 12:08 AM   #27
paulb is offline paulb  Canada
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Maybe Grey will favor us with an update on his mini-Alephs.
[prediction: "Been busy, haven't got to it yet". I can practically say it in my sleep now. If only I didn't have to work to afford my hobby.]
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Old 28th December 2001, 04:57 AM   #28
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Drat!
(Grumble, grumble...Paul's on to me...gonna have to figure out a new line...)
Actually, I've been working on an amp circuit, but not that one. Oh, and mastering the new software (Circad--couldn't hang with the 100 pin limit on the other one Geoff located [used over 200 pins on the amp circuit I've been fiddling with], although I'm sure it's a fine piece of code) that we were talking about in another thread.
How about: "The Swedish Bikini Team dropped by and wanted me to check the fit on their new outfits..."
Actually, the truth is that I've spent a lot of time stuffing my face with turkey and ham and lots of other good home cooking. And building the heat sinks for the second pair of Alephs (water cooled again), and...well, yeah, you know the line. Mea culpa.

Grey
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