paralleling 10uf polyster to the psu bank increases sound quality? any benefits? - diyAudio
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Old 20th April 2014, 04:55 PM   #1
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Default paralleling 10uf polyster to the psu bank increases sound quality? any benefits?

Im thinking to use a 10uf /400V polyster cap in parallel with the psu bank of 40,000uf/100V would there be any advantages? Will there be any improvement in sound quality?
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Old 20th April 2014, 08:07 PM   #2
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No and no. Assuming you don't use just one 40000uF cap, but multiple in parralel, the total ESR will already be very low, possibly even lower than the poly cap on it's own. And the added 10uF is peanuts in terms of capacitance compared to the already avaliable amount.

There are situations where parralelling e.g. a film cap is benificial. If the bank has an impedance peak for example, you can reduce this, but not knowing if, and at what frequency this peak exists, you could also make things worse. That's whay 'just adding' a random cap of random value is a bad idea.

Last edited by funk1980; 20th April 2014 at 08:10 PM.
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Old 20th April 2014, 10:48 PM   #3
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Actually, it can possibly have benefits.

The ESR of those large caps is at relatively low frequencies. At high frequencies the caps don't "look" so good. So the paralleling of a film cap that continues to operate at higher frequencies can help to shunt HF stuff, including pulses from the rectifier and from the line itself (assuming any pass through or bypass the transformer and the main caps.

So, sure no harm, no foul by putting the film cap across the electrolytic cap.

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Old 21st April 2014, 02:30 AM   #4
jcx is offline jcx  United States
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usually the big caps are nowhere near the actual load "demand" point of the active output device collector/drains

the physical distance involves trace and wiring - which adds so much extra L and R to the point that you simply can't see the effect of the tiny cap placed across the big caps

put local RF bypassing with required/designed high frequency well damped low Z performance at the output device leads - not at the big caps end of the ps wires/trace


rectifier snubbers should be across the diodes or the xfmr secondary pair entry into the bridge

Last edited by jcx; 21st April 2014 at 02:34 AM.
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Old 21st April 2014, 02:36 AM   #5
gootee is offline gootee  United States
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Quote:
Originally Posted by jcx View Post
usually the big caps are nowhere near the actual load "demand" point of the active output device collector/drains

the physical distance involves trace and wiring - which adds so much extra L and R to the point that you simply can't see the effect of the tiny cap placed across the big caps

put local RF bypassing with required/designed high frequency well damped low Z performance at the output device leads - not at the big caps end of the ps wires/trace


rectifier snubbers should be across the diodes or the xfmr secondary pair entry into the bridge
Strongly concur.
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Old 21st April 2014, 09:35 AM   #6
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Quote:
Originally Posted by jcx View Post
usually the big caps are nowhere near the actual load "demand" point of the active output device collector/drains

the physical distance involves trace and wiring - which adds so much extra L and R to the point that you simply can't see the effect of the tiny cap placed across the big caps

put local RF bypassing with required/designed high frequency well damped low Z performance at the output device leads - not at the big caps end of the ps wires/trace


rectifier snubbers should be across the diodes or the xfmr secondary pair entry into the bridge
+1

Also check out this thread:
Is bypassing PSU capacitors effective?
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Old 21st April 2014, 12:19 PM   #7
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Quote:
Originally Posted by rhythmsandy View Post
Im thinking to use a 10uf /400V polyster cap in parallel with the psu bank of 40,000uf/100V would there be any advantages? Will there be any improvement in sound quality?
probably not. What you can do, if you are worried about quality is split your 40,000 into 35,000 + 5,000 uf. 35,000 will remain as part of your power supply, 5,000 install as close as possible to output transistor. Just make it, dont worry about visual appearance. In that case you can decrease parasite inductance ( wires that go from PS to output transistor)
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Old 27th May 2014, 11:47 PM   #8
gman76 is offline gman76  United States
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Quote:
Originally Posted by Devilsdance7775 View Post
probably not. What you can do, if you are worried about quality is split your 40,000 into 35,000 + 5,000 uf. 35,000 will remain as part of your power supply, 5,000 install as close as possible to output transistor. Just make it, dont worry about visual appearance. In that case you can decrease parasite inductance ( wires that go from PS to output transistor)
Yes, agreed. Put the charge reservoir near to user of the charge (output stage). Also you could get fancy and invert one channel (assuming two channels are powered from a common supply) and flip the output terminals to get the polarity back. The demand on the supply will be greatly reduced.
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Old 29th May 2014, 01:04 PM   #9
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If you're unlucky, you'll end up with a resonant tank, because of the double-pole-configuration.
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Old 29th May 2014, 07:32 PM   #10
gman76 is offline gman76  United States
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Originally Posted by doctormord View Post
If you're unlucky, you'll end up with a resonant tank, because of the double-pole-configuration.
I think not. What two poles? What frequencies? Resonate with what?
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