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Old 28th December 2011, 07:05 PM   #1
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Default Newbie amp project power supply noise

Hello all, my first post so correct me if I step out of line.
I am starting to build a mini-a (10W). Working on PSU filtering. Considering a CLC.
If there is residual ripple noise on the plus and minus rails does it cancel in the amp?
If I use inductors in each leg of the PSU and they are not well matched, is there a possibility that the two ripple currents could be shifted in phase, and thus additive, and thus create noise in the amp? Considering 30,000uf, 2.2mH, 15,000uf. Any suggestions or precautions? Thanks for the help.
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Old 28th December 2011, 09:17 PM   #2
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First off: No audio related Q is out of line!
The filtering you describe seems to be overly ambitious for the output power.
Please supply the schematic for your amp and PS to get quality advice. E
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Old 28th December 2011, 10:09 PM   #3
zyker is offline zyker  Malaysia
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My Mini-A works great with a bunch of Cs.
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Old 29th December 2011, 12:55 AM   #4
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Thanks both. I guess I can breathe a little easier. My first project and not sure of which issues are most important. I'm sure I'll be back before I'm done.
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Old 29th December 2011, 01:20 AM   #5
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A little CRC filtering is also quite effective without the bulk of an inductor, a 0R22 in each rail between cap banks will give suprising ripple reduction without much voltage drop.
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Old 29th December 2011, 06:02 AM   #6
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I'll give it a try. Thanks
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Old 29th December 2011, 10:35 AM   #7
AndrewT is offline AndrewT  Scotland
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Mains electricity SAFETY is your first important lesson !
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Old 29th December 2011, 06:33 PM   #8
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Thanks Andrew, I've sort of learned that one over the years and on the job.
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