Posted by Chris R. [ 192.55.52.4 ] on April 13, 2005 at 12:18:44:
In Reply to: Re: National Semiconductor Amp Modules posted by Wayne Parham on September 21, 2004 at 22:19:56:
Wayne,
About supply regulation on these chip amps...
The one I built uses two 12KuF (or maybe 15KuF) caps very close
to the chip itself. Using a scope, I can watch the PS droop.
At the point the amp starts clipping, I'm getting only a small
amount of droop. I could go measure it again if anyone cares.
Adding a ~4A regulator would significantly complicate the design and make the project less attractive.
One thing I noticed that was interesting was that in at least
one of my HT receivers, the PS caps were about the same size I'm
using for a single amp. The accountants got to that desing. 
About the previous comment about bigger caps coloring the sound, I
can't imagine how that would work. I can understand how undersized
caps could cause problems, though.
Chris
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