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Power Adapter for ACA Mono Blocks?
Power Adapter for ACA Mono Blocks?
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Old 6th July 2019, 02:42 PM   #1
Dneu2011 is offline Dneu2011
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Default Power Adapter for ACA Mono Blocks?

I tried digging through the forums and had no luck finding an answer. Do the Pass mono blocks use the same power adapter as the stereo units? I just finished building a pair and below is what I ordered.

MEAN WELL GST120A24-P1M 24V 5 Amp 120W Regulated Switching Table Top Power

Are there other cheaper alternatives to this that have worked well?

Thanks.
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Old 6th July 2019, 02:58 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Power Adapter for ACA Mono Blocks?
if brick is good for stereo amp , it's even better when feeding just one channel
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Old 7th July 2019, 05:12 PM   #3
Nelson Pass is offline Nelson Pass  United States
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Power Adapter for ACA Mono Blocks?
Quote:
Originally Posted by Dneu2011 View Post
Are there other cheaper alternatives to this that have worked well?
The Mean Wells are a little more expensive, but I have found them to be
quieter than most, and they do come with a warranty.

Two issues that you have to deal with on switchers -

The rating of the supply has to be at least the peak current draw of the
supply, not the average.

The switchers use sensing circuits to see if the the load has too low an
impedance, and some of them won't turn on into big capacitors. Others
will deliver limited current until the capacitor is charged.

And of course there is always noise....
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Old 8th July 2019, 12:51 AM   #4
MEGA_amp is offline MEGA_amp
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I use one of these to power an ACA, picked up two, one for each channel for MOFO as well, work great, and cheap

LRS-150-24 MEAN WELL | Mouser
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Old 9th July 2019, 06:25 AM   #5
xrk971 is online now xrk971  United States
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Power Adapter for ACA Mono Blocks?
If you want to use a very low ripple linear alternative. The SLB SR PSU can work very well. Under 1mV rms ripple with 4A of current and just requires connection to a trafo. It handles rectification, CRC, and ripple control.
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Last edited by xrk971; 9th July 2019 at 06:29 AM.
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Old 11th July 2019, 07:01 PM   #6
kamco is offline kamco
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On the other hand, if you want to do something totally over the top that's impractical from a cost, size, weight and usability perspective...

500VA 30+30 transformer > 25A Bridge rectifiers > 22mh toroidal chokes > 50V 30,000 uf capacitors > LT338 regulators (set at 23V) > 50V 30,000 uf capacitors. Connected to the ACA with Neutrik terminated star quad cable.

Kind of silly for a a measly 8 watt amplifier, but if you have all of parts in your amp-building stash, why not? Thanks to Nelson Pass for the excellent design.

Ken
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Old 11th July 2019, 07:25 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Power Adapter for ACA Mono Blocks?
I like overkill

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Old 11th July 2019, 08:32 PM   #8
Dennis Hui is offline Dennis Hui  Canada
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Power Adapter for ACA Mono Blocks?
Nice! Haven't seen a TO-3 regulator in a while.
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