Picked up a Studiomaster Series 3 mixer some jerk had on Ebay. Heres the auction.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=005& ;amp ;amp ;sspagename=STRK%3AMEWA%3AIT&viewitem=&item=15012526 6756&rd=1&rd=1

I didn't have the cash at the time to buy this item but was watching it. I knew that it was a Studiomaster board despite the description and sent an email after it ended for the heck of it. I offered to trade some old aluminum wheels and tires that I had laying around here and to my surprise, the guy was very interested. VERY INTERESTED.

We did the deal ( I am somewhat local) and in my euphoria, I didn't notice that the board didn't have a power cord till I got it home. Just a 6 pin jack where a PSU would plug into. No PSU included. I called the guy and he said he bought it at an auction and they told him that it worked perfectly. (Obviously, he doesn't really know this and was trying to offload it.)

My question is... any ideas on how I can get a power supply for this? Anyone know where I can look? I got the scematic from studiomaster (model EP4) but it looks somewhat difficult to build. My brother who is way more knowledgable with electronics than me said it would most likely need a custom transformer.

The board is in amazing pristine condition. Looks like the day it was new actually.

I guess I couldn't really use the tires that I traded so its not a terrible loss but I don't know where to turn to get this working. The board is discontinued as far as I know.

Heres a pic of the 6 pin jack in the rear.



Any help would be greatly appreciated. I don't know where to turn and found this forum via google.

It should be simple. Check the schematics and list what voltages you need.

Roddy's right. You don't need to duplicate the design of the original power supply, just provide the proper voltages with the same, or more, current capacity as the original. Often you will end up with a better supply than the original anyway, as that's where a lot of manufacturers try to save money.
You might be able to use a few off the shelf or surplus regulated power supplies instead of building from scratch.

Ask over here too: http://www.prodigy-pro.com/FORUM/

Rodabod wrote:It should be simple. Check the schematics and list what voltages you need.

Thanks for the reply!

The schematics don't specifically list the voltages. However, someone listed this info in another forum. I don't know if it is correct though as it is from another board.

Pin 1 0V (audio)
Pin 2 -15V (audio)
Pin 3 +15V (audio)
Pin 4 +48V
Pin 5 0V
Pin 6 +15V

beckertronix wrote:Roddy's right. You don't need to duplicate the design of the original power supply, just provide the proper voltages with the same, or more, current capacity as the original. Often you will end up with a better supply than the original anyway, as that's where a lot of manufacturers try to save money.
You might be able to use a few off the shelf or surplus regulated power supplies instead of building from scratch.

Ask over here too: http://www.prodigy-pro.com/FORUM/

THanks for the link. I will post over there and see what happens.

Anyone want to take a look at the schematic and see if they could tell what the voltages would be? I can't post it publicly as they are selling it at studiomaster.

HEY! Why am I listed as a troll?

vlad335 wrote:The schematics don't specifically list the voltages. However, someone listed this info in another forum. I don't know if it is correct though as it is from another board.

Pin 1 0V (audio)
Pin 2 -15V (audio)
Pin 3 +15V (audio)
Pin 4 +48V
Pin 5 0V
Pin 6 +15V

Sounds typical - +/-15V for the supply rails and +48V for phantom. The desk may not have the most massive headroom with only 15V to play with.

Can you get a spec for the original transformer in terms of current capabilities?

Otherwise, you'll have to go through the boring process of adding up the number of opamps, noting their type, and then figuring a safe value for operating them. Post a schematic if you have one.

For phantom power, count the number of mic channels and multiply by the minimum spec. (which I can't remember). Err on the side of caution to avoid sag and to provide a safety factor.

If you want, you can buy a PCB which can provide the necessary voltages which is realtively easy to build for an electronics novice.

Thanks greatly! What the hell, Studiomasters not helping me anyway.

Heres the schematic.

vlad335 wrote:HEY! Why am I listed as a troll?

You'll love it when, some posts later, they'll call you a 'piece of shit'. Or worse ! We all go through it though. Good luck with the power supply.