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Old 14th December 2012, 05:17 PM   #21
1moreamp is offline 1moreamp  United States
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Join Date: Dec 2005
Location: Northern California
I found one of these many years ago. Mine is the EMS 13 90 version 0 to 13 volts and 0 to 90 amps controlled. It draws 15 amps off the wall socket like this so it needs its own 110 circuit if driven to full power. The pic is the 40 25 model but they look the same just different outputs as stated in the name. I have knocked a circuit breaker open with this one so its advisable to have its own 110 circuit. Works like a champ though. IIRC I only paid about $150.00 for this shipped. They sell for $450.00 and up to $700.00 though. Pricey but has been very reliable, and single rack mount size makes it fit the bench nicely. They do have a cooling fan inside them that can be a bit noisy as it seems to have one speed full on. But nothings perfect and I can live with the fan noise issue...

PS By the way these are stack-able so if I got one or two more I could cross connect them to get combined output if I need more power. only draw back is that each one will need its own 110 circuit breaker feed. Its a switcher, but even with high efficiency supplies there are limits to how much current a 110 VAC power circuit can deliver.

And for reference purposes a old school PPI art series A600.2 will draw about 80 to 81 amps if driven just below clipping into 4 ohms mono or 2 ohms stereo, so this size supply is only good for about 600 to 700 watts Class AB amps, and about 900 watts Class D amps. After that you will likely need bigger wall power to accommodate anything larger power wise.
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Last edited by 1moreamp; 14th December 2012 at 05:47 PM. Reason: description
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Old 13th October 2013, 11:45 PM   #22
rrae is offline rrae  Norway
diyAudio Member
Join Date: Mar 2011
Found out, that this topic have very informative content.
Well, i found on ebay DELL AA24150L server power supply, it has 175a on 12v rail!
Dell MJ046 2100W Power Supply for PowerEdge 1855 1955 Enclosure | eBay
Would this PSU be good for testing larger amps?
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Old 14th October 2013, 09:01 AM   #23
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
would be OK for car amplifiers that should be able to run on 12Vdc.
regards Andrew T.
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Old 5th November 2013, 04:07 PM   #24
nikb47 is offline nikb47  United States
diyAudio Member
Join Date: Oct 2013
Location: idaho
I know this thread is pretty much back from the dead but there are lots of options for bench power supplies and most of us diyers should be more than capable of converting some of them. I have scanned the threads a little bit and haven't seen much here so here is some excellent info.

A simple high quality 12Volt 100Amp Power Supply- Part1 - RC Groups
How to convert Server Power Supplies - RC Groups

Most of these server power supplies can be had for $10-$20 shipped each.

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Old 5th November 2013, 05:01 PM   #25
nikb47 is offline nikb47  United States
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Join Date: Oct 2013
Location: idaho
^^^ Off topic of dummy loads so I started a new thread.

Affordable Bench Test Power Supply DIY
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