Proteus-3 power supply

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.
Post Reply
User avatar
Posts: 2117
Joined: Sun Dec 02, 2007 6:03 am
Gear: 6th
Location: Rocket City USA

Proteus-3 power supply

Post by cornutt » Sun Dec 27, 2015 5:12 am

Anyone know what voltages should come out of the power supply on a Proteus-3? Thanks.
Switches, knobs, buttons, LEDs, LCD screens, monitors, keys, mice, jacks, sockets. Now two joysticks!

User avatar
Active Member
Active Member
Posts: 669
Joined: Tue Nov 18, 2008 11:29 am
Gear: dk'tronics speech synthesizer :P
Location: Greece

Re: Proteus-3 power supply

Post by Yekuku » Sun Dec 27, 2015 9:35 pm

I cant be of much help since I have not seen a proteus PSU, but the e4 series of samplers use a switching mode PSU that deliver +12V,-12V, +5V, -5V.
If I remember correct the-5V goes to the DAC .
I hope this might help a bit.
It is all about sharing...

User avatar
Senior Member
Senior Member
Posts: 978
Joined: Sun Sep 26, 2010 10:20 pm
Real name: Francis
Gear: Roland D-50 + PG-1000, JP-8080.
Korg Kaossilator, MicroKorg,
Yamaha Motif Rack.
Location: French Canada

Re: Proteus-3 power supply

Post by fh991586 » Mon Dec 28, 2015 12:05 am

My Proteus FX uses a 9VAC 1amp external psu, if that can be helpful.
Available for sale:
-Chamber of Sounds Jupiter III (mk1) & Jupiter T (mk1)
-The Complete DX7- Howard Massey (with original enclosed sounds on soft disks)

Posts: 4
Joined: Sat Dec 26, 2015 3:58 am

Re: Proteus-3 power supply

Post by raito » Tue Dec 29, 2015 10:59 pm

Why yes, yes I do! Helping out someone else isn't bad for a first post, now, is it?

The Proteus 1/2/3 use the same power (and are the same other than ROM -- that Proteus 3 is pretty rare). I don't think the XR models are any different, other than the expanded memory.

The power is on a 6-pin connector. Here are the voltages:
1 +12V
2,3 +5V
4,5 COM (Ground)
6 -12V

The original power supply may be a Skynet SNP-9031. You can still find them, if you look.
This purports to be original:
ZV311 at EPR Electronics

These may be compatible, and less expensive:
Mean Well PT-45B at Jameco
Artesyn LPT62 at Mouser

The power supply is the weak point of these units. From info on the net, recapping helps. In my case, I think the regulators may be the trouble. When my Proteus fails to boot, I only get a couple volts on the 12V rails. When it does, I get 13.5 or so. Other have trouble with sag.

Here's some other informative links on this: ... splay.html ... ew_803.jpg

Post Reply