WM8741 Eval Board

ChrisR1983 · 8th October 2009, 12:43 PM

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

Bill Fuss · 8th October 2009, 02:51 PM

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.

sq225917 · 8th October 2009, 07:42 PM

Chris what cd player do you have..

gripracer · 8th October 2009, 08:55 PM

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.

ChrisR1983 · 9th October 2009, 09:14 AM

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.

gripracer · 9th October 2009, 09:46 AM

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

sq225917 · 9th October 2009, 01:28 PM

Search for feedback on this forum for the quality of Alberts service and honesty....

you might also like to try teddy pardos teddyreg design.

Bill Fuss · 9th October 2009, 01:37 PM

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.

8th October 2009, 12:43 PM	#1
ChrisR1983 diyAudio Member Join Date: Aug 2009	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 __________________ Chris R -------

8th October 2009, 07:42 PM	#3
sq225917 diyAudio Member Join Date: Jun 2004 Location: sheffield	Chris what cd player do you have.. __________________ hoping to pick up some things.

9th October 2009, 09:14 AM	#5
ChrisR1983 diyAudio Member Join Date: Aug 2009	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. __________________ Chris R -------

9th October 2009, 01:28 PM	#7
sq225917 diyAudio Member Join Date: Jun 2004 Location: sheffield	Search for feedback on this forum for the quality of Alberts service and honesty.... you might also like to try teddy pardos teddyreg design. __________________ hoping to pick up some things.

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8th October 2009, 02:51 PM	#2
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	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.

8th October 2009, 08:55 PM	#4
gripracer Banned Join Date: Mar 2009 Location: Atlanta, GA	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.

9th October 2009, 09:46 AM	#6
gripracer Banned Join Date: Mar 2009 Location: Atlanta, GA	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

9th October 2009, 01:37 PM	#8
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	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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