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Old 25th March 2010, 05:50 PM   #1
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Default 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
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Old 26th March 2010, 04:48 AM   #2
glt is offline glt  United States
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No. You need DC +12 and DC -12. Each of the secondaries connect to a regulated power supply generating +12v and -12v
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Old 26th March 2010, 11:23 AM   #3
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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
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Old 26th March 2010, 12:31 PM   #4
paulb is offline paulb  Canada
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Power Supply for Preamps
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Old 26th March 2010, 12:36 PM   #5
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Thanks Paul; that's a little beyond my capabilities.

Any other simple ideas?
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Old 26th March 2010, 01:59 PM   #6
glt is offline glt  United States
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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...
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Old 26th March 2010, 02:02 PM   #7
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will K18231A Power Supply : Miscellaneous Kits : Maplin work?
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Old 26th March 2010, 03:01 PM   #8
glt is offline glt  United States
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That kit will only provide the +12v. You need a kit that has two regulators: one for positive voltage and one for negative voltage
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Old 26th March 2010, 03:19 PM   #9
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Quote:
Originally Posted by glt View Post
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.
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Old 26th March 2010, 03:32 PM   #10
glt is offline glt  United States
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I was trying to make it easy for the guy... :-)
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