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Old 1st January 2018, 06:07 PM   #11
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally Posted by globalplayer View Post
^Forget what I said.
From the Mean Well LRS psu schematic it seems that - (GND) output is connected to input ground and case.
No negative of the power supply is not connected to the chassis, however safety ground is, thus the output of the supply would be floating.
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Old 1st January 2018, 08:29 PM   #12
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally Posted by Zen Mod View Post
most certainly OP meant Aleph 3 , 30, Volksamp (30)
Now I remember. Just moving one in my sound room this morning....
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Old 1st January 2018, 08:50 PM   #13
globalplayer is offline globalplayer  Germany
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Quote:
Originally Posted by Nico Ras View Post
No negative of the power supply is not connected to the chassis, however safety ground is, thus the output of the supply would be floating.
OK.
A misunderstanding on my side.
Thank you for clarifying.
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Old 1st January 2018, 08:56 PM   #14
Zen Mod is offline Zen Mod  Serbia
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SMPS for Pass A3
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Originally Posted by Nelson Pass View Post
Now I remember. Just moving one in my sound room this morning....
yup

it just arrived at OPLDF
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Old 2nd January 2018, 04:32 AM   #15
tribute is offline tribute  Australia
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Well this has generated a little interest, however I still do not know if the Aleph 3 can operate at over 30VDC with adequate heat sinks, Also if I am correct operating the amp with 2 SMPS would allow it to run cooler? Cheers again for all your input
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Old 2nd January 2018, 06:43 AM   #16
grimberg is offline grimberg  United States
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This eBay listing offers a SMPS which delivers 24V and 20A. This would be a perfect fit for a regular Aleph 3. Use two, as mentioned above, to get dual polarity.

AC 110V-220V TO DC 5V 12V 24V Switch Power Supply Driver Adapter LED Strip Light | eBay
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Old 2nd January 2018, 05:08 PM   #17
Bare is offline Bare  Canada
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Hmmm I bought a pair of SMPS contraptions (connex) each at 25 v.
Thinking such could be ideal for a dual supply .
[No .. Not for a Pass amp project ].
One proved Sketchy on first power up.
Soon dying taking out the Amp board attached to it, Adding further insult to injury; the other Smps soon proved unstable.
0 out of 2 ! Not good.
Support ? None provided. Caveat Emptor Kids.

Plus a lot of needless worry /replacement effort to repair the collateral damage.
Finally fitted a Cap multiplier PS I assembled.. Which works "fine".. 3 yrs on.

Laptop Smps only (if ever again) for Me at least
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Old 2nd January 2018, 05:28 PM   #18
grimberg is offline grimberg  United States
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I prefer and use linear power supplies. However, I've been around long enough to understand that when a member is fixated on one kind of solution, there is very little chance to convince that person otherwise.
The SMPS units made for computers and sold under some well regarded brands (e.g. Corsair, Seasonic, etc.) are very reliable. eBay offerings vary widely and I would rather not use them. What I suggested was a unit that claims to deliver voltage and current compatible with the demands of the amplifier in question. But as you said, Caveat emptor!
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Old 2nd January 2018, 06:11 PM   #19
Nico Ras is offline Nico Ras  South Africa
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SMPS is a bad choice for dynamic loads such as class A/B however it performs great for class A. But as grimberg remarks brand names are important else you may encounter an ugly experience like Bare mentions.
There is nothing magical about SMPS but Meanwell seems one of the better choices in Chinese brands which I have used in the past without complains.
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Old 3rd January 2018, 11:13 PM   #20
tribute is offline tribute  Australia
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Hi Guy's, Thanks for all your feedback & help. I have managed to find a 12VDC to +/- 32VDC (adjustable down to 20v) on Ebay that I think will do the trick nicely.
350W DC12V To Dual 32V Boost Power Supply Board For HiFi Amplifier Car Amp | eBay
In my parts bin I have a 12VDC 14amp SMPS which should be able to feed the converter nicely. Cheers
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