power supply E-MU Proteus MPS

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power supply E-MU Proteus MPS

Postby Fred » Sun Apr 16, 2017 12:14 pm

Hi, I have lost the powersupply of my E-MU proteus MPS.
Can somebody help me for the electr. diagram/circuit of the powersupply? Or other info?
On the photo of the original powersupply is listed only: Out CT 18V AC 1,5 amp.
But there are going three wires in the synths. Two to the on/of switch and one directly to the bottom of the print (probably the 'ground'?).
So I am wondering, what kind of AC transformer do I need? Probably a dual- trafo, but......2 x 18 V or 2 x 9 volt?
Interesting: the Proteus FX uses a singel 9 V AC powersupply.
Thanks for helping!
Fred
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Re: power supply E-MU Proteus MPS

Postby madtheory » Mon Apr 17, 2017 12:57 pm

If you don't understand why the switch is wired that way, you should hand this over to a tech. That's a basic circuit- you'll electrocute yourself.
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Re: power supply E-MU Proteus MPS

Postby Fred » Mon Apr 17, 2017 1:57 pm

Thanks for the warning MT, but I am not uncommon working with wiring, My only problem is - in the absence of the electr. diagram - that I like to know the AC voltage the trafo should deliver, read my question above. I wished somebody owns the powersupply and can measure the three outs of the trafo.
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Re: power supply E-MU Proteus MPS

Postby Yekuku » Mon Apr 17, 2017 10:28 pm

Hi Fred and welcome aboard.
According to this pic from syntaur :
Image
It looks like it is a center tapped (CT) transformer that outputs 2 x 9V = 18VAC (9V-0V-9V).
I think that the pinout is also printed on the top, but the pic quality doesnt help to take a readout. My guess is , according to the printed pinout, 9V (Left pin) - 0V (Top pin) - 9V (Right pin)
Dont get madtheory wrong, power mains transformers can be lethal, if you don't know _exactly_ what you're doing.
It is all about sharing...
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Re: power supply E-MU Proteus MPS

Postby commodorejohn » Mon Apr 17, 2017 10:55 pm

I think it's actually 18V-0V-18V, but I'll try to remember to dig mine out this evening and check.
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Re: power supply E-MU Proteus MPS

Postby Fred » Tue Apr 18, 2017 8:41 am

commodorejohn wrote:I think it's actually 18V-0V-18V, but I'll try to remember to dig mine out this evening and check.

Thank you for your reply Yekuku and CommodoreJohn !!
Yes I suppose also that it is a center tapped transformer. I saw the photo before.
CommodoreJohn, I really hope you can find out what is the case 9-0-9 or 18-0-18? That will be of great help!!
The top pin will be the 'zero'?
And do you think the synth needs 2 x 1,5Amp or in total 1,5Amp?
(pfff..... I've wrote several times to E-mu, but no reaction at all...)
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Re: power supply E-MU Proteus MPS

Postby Fred » Tue May 02, 2017 9:54 am

commodorejohn wrote:I think it's actually 18V-0V-18V, but I'll try to remember to dig mine out this evening and check.

This is a polite reminder for CommodoreJohn:
I really hope that you or an other user can make it clear: 9-0-9 Volt or 18-0-18 Volt?
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Re: power supply E-MU Proteus MPS

Postby Fred » Tue May 23, 2017 10:50 am

For anyone who wants to build this powersupply:
I've got my Proteus MPS working!
I bought a 230 (or 115) V to 2 x 9 Volt transformer like this one
http://docs-europe.electrocomponents.co ... 59b32a.pdf
You need 2 x 9Volt AC 1,5 amp ( or a 18V CT [center tapped]), not 2 x 18V AC!
The connector to the MPS is a mini-din-connector with 3 pins.
You connect two pins on the transformer, so it delivers
on the din connector:
left - middle pin 9V
right - middle pin 9V
right - left pin 0 (zero) V. (I didn't dare to try 18V here).

NB: Only for experienced technicians to construct, working with electricity is live threatening!!
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