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Which power supply. Old Soundcraft Spirit Live.


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Hi guys,

I'm trying to find a power supply for an old Soundcraft Spirit Live. It was just donated to me and

I plan on using it as another backup desk. Do you know what PSU this is meant to use?

I have the manual and it makes no mention of the required supply. I believe this is a standard

supply at 17-0-17 with 48V phantom, suspecting the PSU is the CPS150.


Can you confirm my suspicion that the CPS150 is the correct device?


Does anyone (In the UK) have a spare PSU available for sale?




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I checked around that page, but the desk isn't listed anywhere. http://www.blue-room.org.uk/public/style_emoticons/default/unsure.gif


Having now taken the desk apart for basic checks on faders and pots, it appears in good condition.

I've metered out the power connector and checked the channel strips to identify the power feeds.


The power is fed to the TL072's through 10ohm resistors, as this IC is max 18v-0-18v the power fed from

the PSU must be 15-17v split. The Phantom feed is a very simple 47uF 63v capacitor with a parallel

12K resistor. This feeds to the channel strips, then the Mic ports through a pair of 6k8 resistors. The phantom

power goes nowhere else on the board.


So I suspect the power supply must be a well regulated unit with split 17v and a 48v DC feeds.

The desk has no regulation on board and barely any smoothing which is surprising.



I think I'll be powering up the bench supply later today to get the desk running for complete checks. I'll worry about

phantom power once the desk is tested.


Thanks for the feedback guys. http://www.blue-room.org.uk/public/style_emoticons/default/smile.gif

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I saw a Spirit Live 16 channel a little while back, and was surprised to nitice it used the same power supply as my old Seck 18-8-2, and a google gives this, which has helpful photos.




Oh yes, and a schematic...

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Most of the old spirits just need 17 0 17 and 48, all well regulated and smoothed as there's little power control in the desk.


You could look on eBay for any desk power supply with the right voltages, it wouldn't be hard to add extra smoothing if you had to.

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