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-   -   Wolfson WM8741 Evaluation Board (http://www.diyaudio.com/forums/digital-line-level/163837-wolfson-wm8741-evaluation-board.html)

ChrisR1983 25th March 2010 06:50 PM

Wolfson WM8741 Evaluation Board
 
Guys

For this eval board I have purchased the 2x 12v transformer: AC 230 V Toroidal Mains Transformers : Mains Transformers : Maplin

Am I right in saying I can connect this directly to the Wolfson eval boards connections for + and - 12v?

Thanks

Chris

glt 26th March 2010 05:48 AM

No. You need DC +12 and DC -12. Each of the secondaries connect to a regulated power supply generating +12v and -12v

ChrisR1983 26th March 2010 12:23 PM

I thought the eval board did this as it included a rectifier?

What can I use to convert my 2x 12v AC to DC that is easy and inexpensive?

Thanks

Chris

paulb 26th March 2010 01:31 PM

Power Supply for Preamps

ChrisR1983 26th March 2010 01:36 PM

Thanks Paul; that's a little beyond my capabilities.

Any other simple ideas?

glt 26th March 2010 02:59 PM

You can use something like this: Low Current Bipolar Power Supply (LCBPS) - A Regulated CLRC Supply

ebay has other kits but they take a "center-tapped" secondary. Since you have dual secondaries, you need a power supply that takes in dual secondaries...

ChrisR1983 26th March 2010 03:02 PM

will K18231A Power Supply : Miscellaneous Kits : Maplin work?

glt 26th March 2010 04:01 PM

That kit will only provide the +12v. You need a kit that has two regulators: one for positive voltage and one for negative voltage

richie00boy 26th March 2010 04:19 PM

Quote:

Originally Posted by glt (Post 2132177)
ebay has other kits but they take a "center-tapped" secondary. Since you have dual secondaries, you need a power supply that takes in dual secondaries...

No you don't. Simply connecting the two windings in series gives you a "centre tap".

Chris I don't think you will find what you need as a ready made item. Have you a small budget for the power supply? As I may be able to build one for you.

glt 26th March 2010 04:32 PM

I was trying to make it easy for the guy... :-)


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