[sdiy] digisound power supply

Mon Mar 29 22:25:37 CEST 2010

Ian,

These Power One Style PSU's don't come with mains plugs, they are designed
to be mounted within other equipment.

It's not too hard to connect up an IEC socket, fuse and switch. I can always
send you some photo's of how I mounted mine. It might also be worth rigging
up some form of DC distribution, something like the MOTM ones for +/-15V and
5V, here:

http://www.synthtech.com/testcart/index.php?main_page=product_info&cPath=67&
products_id=182

or like the Oakley Dizzy for just +/-15V

http://www.oakleysound.com/dizzy.htm

It makes isolating and de-bugging individual modules so much easier.

I suspect the eBay seller I mentioned has a few of these PSU's, so I'll
likely bid for one myself, though I'll try not to bid against you.

Regards

Mike Gorman

-----Original Message-----
From: ian taylor [mailto:ioddity2001 at hotmail.com] 
Sent: 29 March 2010 20:54
To: mikegorman at btinternet.com; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] digisound power supply

Hi Mike thanks very much for replying, I had almost given up getting any,
im sure this subject has beeen covered many times before,
but as the list doesn't have a search function (does it?)
I might have to go through 1000's of posts before I came to something
appropriate!
(this is why I like forums much better to be honest although I might be
missing something...)

According to the digisound documentation the upgraded (1 amp) psu should
power around 40 modules,
which is more than I can fit into my cabinets so should suffice, 
and as you say I can add more supplies if needed.
I don't mind about overkill, so long as I can't damage anything.

That ebay psu certainly looks like a great find i'll give that a go assuming
I don't get outbid.
The only thing is I can't see any mains type plug, but no doubt I can get
the info I need from R3 online.

Well thanks again. hopefully i'll get my system up and running soon, cheers.

> From: mikegorman at btinternet.com
> To: ioddity2001 at hotmail.com; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] digisound power supply
> Date: Mon, 29 Mar 2010 18:55:17 +0100
> 
> Ian,
> 
> I noticed that you didn't appear to get any replies to this query, so I
> thought I'd throw in a few ideas.
> 
> I was going to suggest a Power One style supply. I sourced one from
Farnell
> in the UK by a maker called Calex, like this one:
> 
> http://uk.farnell.com/calex/32212b/psu-open-frame-12v-15v-1-7a/dp/4893864
> 
> but they also do a triple output version, here:
> 
>
http://uk.farnell.com/calex/32305b/psu-open-frame-5v-3a-12v-15v-1a/dp/489389
> 0
> 
> 3A on the 5V rail is massive overkill for the Alphadac and keyboard
> requirements, but it is a good linear supply, if a little on the expensive
> side.
> 
> Depending on how many cards you have in the Alpadac, I suspect you will
need
> at least a few hundred mA on the 5V rail, so the small regulator you
linked
> to would probably not be the best solution, as apart from probably needing
a
> heatsink, (dropping 10V at 200mA is a couple of watts of power that will
> need dissipating somewhere), you are also adding to the load on the +15V
> rail, which could stretch some limits there as well.
> 
> Whilst browsing on eBay today though, I came across a similar supply to
the
> Calex at a much more reasonable price, here:
> 
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350333193755
> 
> When you get a supply working again though, I think it would be a good
idea
> to find out what the current consumption of all of the modules are. At
least
> then you would be able to add extra PSU's for the 15V rails should this be
> required.
> 
> Hope that helps.
> 
> Regards
> 
> Mike Gorman
> 
> 
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of ian taylor
> Sent: 24 March 2010 12:18
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] digisound power supply
> 
> 
> Hi all, im sure you come across power supply issues again and again...
> 
> I have around 30 digisound modules and a keyboard that need power,
> looks like my original digisound supply has given up so im looking for a
> replacement.
> I've seen a couple of people who have used power one and motm supplies,
> so maybe one of those will do the job?
> (the motm tripple supply looks good but im not sure its powerful enough to
> drive all my modules)
> I'm really not confident enough to rebuild my existing supply although I
do
> have the 1A version.
> 
> I need +/- 15 volts ideally about 1 amp per rail so all the modules can be
> powered,
> plus a separate +5 volt supply for the alphadac controller.
> The board inside the keyboard does have an output for 5 volts, but
according
> to the literature I need a separate one,
> I have no idea how much current the alphadac needs but obviously more than
> the keyboard board provides.
> I do have a separate little power supply board to provide 5 volts from
10~15
> volts ac,
> which I was hoping would give me the extra 5 volts from the main supply,
> rather than use 2 separate ones,
> here's a link to the item:
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160413173496  
> 
> Does anyone have experience with powering this system? And specifically
the
> keyboard/alphadac combination?
> Or any ideas whats best to go for?
> I'm in the UK so would prefer to source it here, 
> regardless I need to power up the system so I don't mind getting one
shipped
> in.
> 
> Cheers.
>  		 	   		  
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