Decoupling Caps, quite interesting

mdlover · 15th June 2003, 07:04 PM

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....

will try soon.

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

15th June 2003, 07:04 PM	#1
mdlover diyAudio Member Join Date: Jun 2003 Location: HK	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.... will try soon. cheers.

16th June 2003, 08:00 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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 __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

16th June 2003, 01:57 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	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. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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16th June 2003, 05:15 PM	#6
crown300 diyAudio Member Join Date: Oct 2002 Location: pittsboro, NC	(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.

16th June 2003, 06:59 PM	#8
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	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®

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