oh no! where can i find a PSU for an Allen&heath GS3 ?

  • Thread starter Thread starter earworm
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i did a few more searches on this forum and found a link to a site where they do mods for soundcraft Ghosts and allen & heath mixers,
i mailed them and they say they should be able to sell or build me a psu that should work,

but i havent found yet how much Volt and Ampere the psu for the GS1 gives,

does anyone know this? (the A&H tech support people haven't replied yet)

thanx
 
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nice, i received an email from the tech support:

both the MPS9 and the RPS11 will work with the GS3.

The MPS9 gives +/-15VDC @1.25A per rail and +48VDC at 100mA.
The RPS11 gives +/-16VDC @ 5A per rail and 48VDC at about 500mA.

The RPS11 is considerably more powerful than you need for the GS3, but will work fine. You need to make sure that you get one with the correct DC cable, as the standard RPS11 comes with a 10-pin circular connector for the GL4000 as standard. The RPS11-3C comes with the correct cable though. If you need a cable for this purpose, the part number is 002-225.



what does this mean: 1.25a PER RAIL ?
can someone explain what they mean with
"+/-15VDC @1.25A per rail and +48VDC at 100mA. " ?

thanks
 
more is good, i'll remember that,
if the psu is too weak i'll blow the psu,
and if the psu is too strong,,,,,will i blow the mixer? or only if the voltage is too high? :o

and what if i just connect a NON linear psu to my mixer...will it explode?
 
If the PSU doesn't provide enough current, you probably won't blow it, but it will probably effect the life of the unit, and could run hot. But the worst symptom will be on the audio output of the mixer... underpowering the op amps in the signal path will cause distortion and a lack of "punch".

You won't blow the mixer with a high current supply, voltage is the critical spec... the mixer will only pull as much current as it requires.
 
earworm said:
nice, i received an email from the tech support:

both the MPS9 and the RPS11 will work with the GS3.

The MPS9 gives +/-15VDC @1.25A per rail and +48VDC at 100mA.
The RPS11 gives +/-16VDC @ 5A per rail and 48VDC at about 500mA.

The RPS11 is considerably more powerful than you need for the GS3, but will work fine. You need to make sure that you get one with the correct DC cable, as the standard RPS11 comes with a 10-pin circular connector for the GL4000 as standard. The RPS11-3C comes with the correct cable though. If you need a cable for this purpose, the part number is 002-225.



what does this mean: 1.25a PER RAIL ?
can someone explain what they mean with
"+/-15VDC @1.25A per rail and +48VDC at 100mA. " ?

thanks
Click to expand...

There are two different voltage supplies, the +-15 for the opamps, and the +48 for phantom power. The A is the max amperage supplied, you shouldn't exceed that, or power supply components will overheat and shut down. Usually PSUs are designed to be OK again after they cool down, but it's not a good idea to push it.

Power supplies only provide as much current as is demanded, so it's not a problem to use a power supply with a higher amp rating. The voltage supplies must be correct, within certain tolerances. Phantom power I believe can range from 45 to 52 volts, the opamps will be happy with anything from +-12 to probably as much as 18 volts, but at reduced headroom with lower voltages.
 
earworm said:
and what if i just connect a NON linear psu to my mixer...will it explode?
Click to expand...

I don't of much audio stuff that runs off switching power supplies . . . I wouldn't risk it, myself.
 
these guys:

http://www.orchid-electronics.co.uk/

tell me that they can build me a switching psu that will work on the gs3,
for €320

would i dare to use this then? you say it might not be safe?
it seems to be a decent company, they're very friendly in their emails,
but i've got this other company that can make me a different psu:

a linear psu from a soundcraft, the CPS-150

i found one on ebay, and they offer it for about the same price, plus the right cable to connect to my mixer

http://cgi.ebay.com/SOUNDCRAFT-CPS-...tcZphotoQQssPageNameZWDVWQQrdZ1QQcmdZViewItem

what would you choose?
 
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earworm said:
these guys:

http://www.orchid-electronics.co.uk/

tell me that they can build me a switching psu that will work on the gs3,
for €320

would i dare to use this then? you say it might not be safe?
Click to expand...

It seems somewhat expensive to me, because the parts for a linear supply don't cost that much. But maybe you aren't up to building a power supply, I don't know.

It's not that a switching supply is dangerous, it's that they aren't necessarily designed for audio. A switching supply will yield a noisy power supply; whether or not that noise creates a problem for audio depends on the power supply design and the requirements of the audio circuit. That is probably why their design is expensive.

The advantage of a switching supply is that it's more efficient than a linear supply. But opamp-based audio circuits don't need that much power (<1.25A in your case), so nobody cares too much if some gets wasted.
 
Did you try just asking the shipping co. about a tracking number and re-tracking the package? Asking the shipping co. who were the "first" handlers/drivers on that day to verify whether they had seen a smaller box "taped" to the console box! I don't think they could have missed this if it were,because that would have been to odd of a package! Just.....and I mean just, say for instance the seller DID tape the power supply to the console, it should've been some trace of it on the bigger box. ( tape residue,pulled off card-board if ripped from the bigger box, etc.) Investigate completely, before spending more money on buying/building a power supply for a "not to sure of a working console"...! Hope it works out for you! ;)
 
i contacted the shipping co and they say that if there is no 'tracking number' on the second package its impossible to track,
and it was just a cardboard thing with nothing on,

the seller says that on the outside you couldn't see that there was an extra box..in the big package.

and i inspected the box five million times and there's hardly any traces of ducktape being pulled off or whatever

the shipping company says its the responsability of the seller, and since he has an 'account' he should start the investigation, too bad cause he's acting a bit like a bitch i think. and then, lets start an investigation, lets look for a rectangular box :( ,,,,thats it..

i have to wait 30 days before i can file that ebay claim, i already 'talked' to ebay about it and they're on my side, not that it helps much,
seems like the max amount of money i can get back is $175
(or can ebay force the seller to pay the total amount back?)

so if i get that, and maybe if i sell my soul to someone i'll have enough for a new psu, and if the console wont work, damn.....
 
Power supply unit for Allen & Heath ( MPS8-P clone)

Hello,
I found this thread via google.

I just wanted to let you all know that I am now building (on demand) power supply units for many Allen & Heath mixers. Out of frustration of not being able to find one (and a local night club, here in Portland needing one), I built one based on the MPS8-P. Except that it has a built in fan and can withstand more use, heat, work, etc.

After materials and labor, the final cost on these will be $865

There are 4 LEDs (green for power, blue for -15v, red for +15v & amber for +48v).
The next revision will include individual fuses for each power supply at no additional cost!

If anyone is interested, I can crank one of these out pretty quickly (depending on my regular work load and schedule, etc.).

Check out my website at: www .wireaudiorepair. com/mps8p/ for pictures of the power supply unit.

btw, I realize this as my first post might seem offensive to some, as I just registered. Yes, I am promoting my product, but I am a musician of 24 yrs., an audio tech of 17 yrs and run my own independent business. I am here to provide help to the growing demand of A&H mixer users in need of a power supply for their mixer! Thanks again.

Sincerely,
Eric
 

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