[sdiy] digisound power supply

[Mike Gorman]

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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