Newbie amp project power supply noise

rory1327 · 28th December 2011, 07:05 PM

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.

mickeymoose · 28th December 2011, 09:17 PM

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

zyker · 28th December 2011, 10:09 PM

My Mini-A works great with a bunch of Cs.

rory1327 · 29th December 2011, 12:55 AM

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.

jkuetemann · 29th December 2011, 01:20 AM

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.

rory1327 · 29th December 2011, 06:02 AM

I'll give it a try. Thanks

AndrewT · 29th December 2011, 10:35 AM

Mains electricity SAFETY is your first important lesson !

rory1327 · 29th December 2011, 06:33 PM

Thanks Andrew, I've sort of learned that one over the years and on the job.

28th December 2011, 07:05 PM	#1
rory1327 diyAudio Member Join Date: Oct 2011	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.

29th December 2011, 01:20 AM	#5
jkuetemann diyAudio Member Join Date: Dec 2010 Location: Paris, Ontario	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. __________________ ---Jason Kuetemann--- The greatest trick the Devil ever pulled was convincing the world he didn't exist; and like that, he's gone.

29th December 2011, 10:35 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Mains electricity SAFETY is your first important lesson ! __________________ regards Andrew T.

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28th December 2011, 09:17 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	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

28th December 2011, 10:09 PM	#3
zyker diyAudio Member Join Date: May 2011	My Mini-A works great with a bunch of Cs.

29th December 2011, 12:55 AM	#4
rory1327 diyAudio Member Join Date: Oct 2011	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.

29th December 2011, 06:02 AM	#6
rory1327 diyAudio Member Join Date: Oct 2011	I'll give it a try. Thanks

29th December 2011, 06:33 PM	#8
rory1327 diyAudio Member Join Date: Oct 2011	Thanks Andrew, I've sort of learned that one over the years and on the job.

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