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Old 8th October 2009, 11:43 AM   #1
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Default WM8741 Eval Board

Guys

I've recently managed to 'finangle' a free evaluation board from Wolfson (WM8741) - I've been told it will arrive in the post tomorrow

I am going to need some help putting this into a fully working DAC - simply because my DIY electronics skills aren't as good as my 'finangling' skills.

SO - can anyone point me in the direction on the following

- A schematic for a power supply and how I connect this up?
- A method of getting the audio out (RCA) on my CD Player and into the SPDIF input on the DAC?

Thanks all

Chris
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Old 8th October 2009, 01:51 PM   #2
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Hi Chris, I suggest you go to the PS forum and ask for suggestions. Those guys know how far to go with a PS for digital.
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Old 8th October 2009, 06:42 PM   #3
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Chris what cd player do you have..
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Old 8th October 2009, 07:55 PM   #4
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1. You can buy little adjustable regulator boards on ebay that do the trick

2. Also, you can use a computer power supply, I think the Wolfson's PSRR is good enough for a noisy PC power supply.

3. Also, standard 3 and 5 volt wall warts will work as well

none of those are super-noiseless, but they will work.
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Old 9th October 2009, 08:14 AM   #5
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Thanks for the feedback so far.

I currently don't have a CD player - I'm using a Sony DVD player at the minute that is pretty rubbish.

I'd be interested to build the best possible power supply I can and house it in an enclosure.
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Old 9th October 2009, 08:46 AM   #6
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here is a really excellent regulator kit:

http://cgi.ebay.com/SPEEDO-MK2-Regul...item1c0d14cc06

But for easy and versatile (can be applied to essentially ANY non-power-amp project) pick up this set.

http://cgi.ebay.com/Variable-DC-Powe...item41449a9b57
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Old 9th October 2009, 12:28 PM   #7
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Search for feedback on this forum for the quality of Alberts service and honesty....

you might also like to try teddy pardos teddyreg design.
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Old 9th October 2009, 12:37 PM   #8
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As the board employs it's own regulator circuits I don't think building a complicated high quality PS would benefit it at all. You could use 7812/7912s or 317/337s to build a pretty robust unit, or pick more exotic units to use and just use the recommendations in the device data sheets.
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