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Old 14th July 2011, 08:13 AM   #1
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Join Date: Jul 2011
Default Tips for building D-class?

I just ordered Hypex UCD400 HxR D-class amp & SMPS400 power supplys, and I'm building 2 mono amps on their own boxes. I have some experience on electrics and I know the basics, but now I started thinking that what should I understand when building such an amplifier to get all it's potential out without any distortions or other problems?

- Should I somehow physically separate the amp & power supply from each other?
- Should I use twisted wires somewhere?
- Are there any other potential problems with distortions etc. that should be noted?
- After the amp is ready, how could I measure that is is built correctly before connecting it to the pre-amp & speakers (and blowing them away IF something was wrong)?
- I tried to search for the building instructions for Hypex UCD, but they are mostly just "connect-this-wire-to-there" instructions without any deeper knowledge on shieldings or distortions. Are there any GOOD instuctions around?

All hints are more than welcome!
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Old 14th July 2011, 11:31 AM   #2
marce is online now marce  United Kingdom
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Join Date: Jun 2007
Location: Blackburn, Lancs
EMC Information Centre - The EMC Journal (Free in the UK)
They have a series running regarding EMC and SMPS, Class D etc, it is worth looking at, as Cladd D designs are a potential EMC nightmare.
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Old 14th July 2011, 11:38 AM   #3
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Thanks for the tip, Marce!

I couldn't find much information from the site anyway, since I'm from Finland I can't get those free informations.

Are there any "EMC for dummies" guides for D-class DIY'ers around..?
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Old 17th July 2011, 07:24 AM   #4
marce is online now marce  United Kingdom
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Join Date: Jun 2007
Location: Blackburn, Lancs
Try these links, articles you want are near back of publication.
http://www.compliance-club.com/pdf/Issue93.pdf
http://www.compliance-club.com/pdf/Issue94.pdf

http://www.nxp.com/documents/applica...te/AN10912.pdf
http://www.onsemi.com/pub_link/Collateral/AND8301-D.PDF

Check data sheets and application notes for thye various driver chips that are available for SMPS.
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