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Old 15th May 2013, 09:05 PM   #1
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Default Multiple parallel caps in a PS is there a downside?

I'm building a new power supply for my sound processor's dac daugher card. I have an extra transformer around and some caps. I have a few at 1000uf, 2200uf, and 470 uf. I would like to bet about 3000-6000uf since the ps will support about 5 DAC AK4395 dac chips. Is there any downside in having multiple caps in parallel feeding the regulator. Is it better to go out and purchase one larger cap per regulator?

Last edited by steven2583; 15th May 2013 at 09:47 PM. Reason: Mistated what I wanted put serial instead of parallel
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Old 15th May 2013, 09:33 PM   #2
DF96 is offline DF96  England
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Caps in series add ESR, and usually need voltage balancing resistors. You will need a lot of 1000uF if you are going to use them in series (and parallel) to get 3000uF. Remember, caps in series reduce their net capacitance.

Did you actually mean caps in parallel?
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Old 15th May 2013, 09:38 PM   #3
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I misstated. I want to use them in parallel.
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Old 15th May 2013, 09:47 PM   #4
DF96 is offline DF96  England
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Caps in parallel are fine. Some people do that as a matter of habit, as you can get reduced ESR and inductance. Just be careful where the ground currents go.
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Old 15th May 2013, 10:41 PM   #5
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Quote:
Originally Posted by DF96 View Post
Caps in parallel are fine. Some people do that as a matter of habit, as you can get reduced ESR and inductance. Just be careful where the ground currents go.
Valve amplifiers often have 2 or 3 stages of RC to get very low voltage ripple.
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Old 16th May 2013, 03:23 AM   #6
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Is it better to have one larger cap or multiple small ones? I'm thinking using ELNA Silmic II and a Nich Muse cap.
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Old 16th May 2013, 11:01 AM   #7
AndrewT is offline AndrewT  Scotland
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How about asking the Forum to change the title of your Thread?
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Old 16th May 2013, 11:07 AM   #8
tinitus is offline tinitus  Europe
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title changed to concern paralel caps instead of series connected


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Old 22nd May 2013, 02:40 AM   #9
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Try some inductance CLC in there for low ripple.
Downside? Running out of space for more caps inside the chassis.
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Old 22nd May 2013, 07:31 AM   #10
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What he said plus all the time it takes soldering them all together. The upsides in SQ are generally more than an adequate reward for the time spent IME.
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