[sdiy] digisound power supply

[ian taylor]

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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