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-   -   Decoupling Caps, quite interesting (http://www.diyaudio.com/forums/chip-amps/16497-decoupling-caps-quite-interesting.html)

mdlover 15th June 2003 07:04 PM

Decoupling Caps, quite interesting
 
I have replaced the 1000uF power decoupling Caps with 2x470uF in parallel today and they do have a difference.

Hard to tell which is better, the sound is more energetic with parallel Caps (good for pop rock), a bit laid back with single Cap.... ;)

how about other combinations, like 3x330uF or even 4 to 5x220uF....:idea:

will try soon. :D

cheers.

Nuuk 16th June 2003 08:00 AM

That's interesting mdlover. I'm sure some of the speed and delicacy of the GC's is down to the small amount of capacitance used and perhaps using even smaller caps paralleled gives more of the same!

The GC world awaits the results of your further experiments with bated breath and smoking soldering irons ;)

Peter Daniel 16th June 2003 01:57 PM

It was also my experience that bass was more pronounced (if not too boomy) with parallel caps, but overall I preferred smotther presentation of single caps.

Nuuk 16th June 2003 03:33 PM

Quote:

It was also my experience that bass was more pronounced (if not too boomy) with parallel caps, but overall I preferred smotther presentation of single caps.
Peter, correct me if I am wrong but didn't you try paralleled 1000 ufds rather than smaller values?

carlosfm 16th June 2003 03:42 PM

Quote:

Originally posted by Nuuk


Peter, correct me if I am wrong but didn't you try paralleled 1000 ufds rather than smaller values?

I think (correct me if I'm wrong) that Peter tested with BGs.
They are different animals.
Anyway, I always bypass the 1000uf caps with 0.1uf and that gives lower PSU impedance at high frequencies.
In these case, I may not notice any difference in using two 470uf caps.
Or the difference would be subtle.

crown300 16th June 2003 05:15 PM

(gotta jump in sometime.....)
I have been trying to do some Spice on the GC power supply and have noticed that at high current levels (= 2 Amps) the electrolytic is recieving very large ( > 10 Amps) charging pulses. For a Panasonic FC type cap this is way over its limit of RMS ripple current - 2.5 amps.
IMHO, it seems the use of two smaller caps would make this less of a problem.

Peter Daniel 16th June 2003 05:17 PM

Quote:

Originally posted by Nuuk


Peter, correct me if I am wrong but didn't you try paralleled 1000 ufds rather than smaller values?


I was playing only with 1000u caps (so 2 x 1000 in parallel).

JOE DIRT® 16th June 2003 06:59 PM

Correct me also if I am wrong I prefer multiple caps and have them bypassed with smaller caps to keep the impedance to ground lower...thats just how I have done my design approach..I find the smaller caps more rugged for power supplies

DIRT®

mikelm 16th June 2003 07:02 PM

Quote:

Originally posted by crown300
(gotta jump in sometime.....)
I have been trying to do some Spice on the GC power supply and have noticed that at high current levels (= 2 Amps) the electrolytic is recieving very large ( > 10 Amps) charging pulses. For a Panasonic FC type cap this is way over its limit of RMS ripple current - 2.5 amps.
IMHO, it seems the use of two smaller caps would make this less of a problem.

I think that the ripple current would be an average figure and normally quoted at quite a high temperature so the 10 amp pulses may not be that great a problem especially if ( in the real world ) the caps don't get too hot.

cheers

mike

Peter Daniel 16th June 2003 08:36 PM

Quote:

Originally posted by JOE DIRT®
Correct me also if I am wrong I prefer multiple caps and have them bypassed with smaller caps to keep the impedance to ground lower...thats just how I have done my design approach..I find the smaller caps more rugged for power supplies

DIRT®

I also preferred many things that I thought should be appropriate and in line with the usual audiophile wisdom, untill I actually started to listen to what I build. It's not always apropriate any more;)


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