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Old 24th August 2001, 03:17 AM   #1
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Hi,

What is the voltage drop on the PSU when it is loaded with the rest of the circutry. To get the rails to 45 VDC unloaded you need to use a 33V [(Vrms+1.4)*sqrt2] transformer. But is it enough? I am thinking about getting a pair of 500VA torroids from Piltron and they do have 33V secondaries. Would increasing the PSU capacitance decrease the voltage drop?

dee
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Old 24th August 2001, 04:16 AM   #2
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Dee,
I'd recommend going for 750 VA, minimum (I've got 1000VA Plitrons on my Aleph 2s, filched from an unfinished project--still need to order proper transformers for the Alephs). 500 VA would be cutting it a bit thin. The 45V rail isn't unloaded--it's going to have to deliver 3A or so at that voltage, and that's at idle. If you pull back too much, the rail will drop, and the transformer will tend to run hot.

Grey
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Old 24th August 2001, 04:26 AM   #3
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Default PSU

Thanks Grey,

I was just doing some calculating before jumpin' in both feet. Is 33Vs enough or jum to 35V? Going to the 1.5KVA puts you in the 38V minimum output which vould yield a 55VDC unloaded output. How much would the load pull that down? 10%?

dee
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Old 25th August 2001, 02:34 PM   #4
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Most informative

dee
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Old 25th August 2001, 07:46 PM   #5
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Hi,
you can find a good PSU software from Duncan's:

http://www.duncanamps.com/

It works fine, I think.
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Old 26th August 2001, 12:22 AM   #6
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thanks, Now i just have to figure out the loa on the PSU. Has anybody actually measured the Aleph 2 load on the PSU is it really 3.3 A per side?

dee
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Old 27th August 2001, 01:08 AM   #7
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More like 3A per side.
I run mine a little hotter, simply because I can get away with it. The water-cooled system I use can dissipate the extra heat easily.

Grey
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