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Capacitor question
Capacitor question
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Old 8th September 2016, 08:04 AM   #1
sumotan is offline sumotan  Indonesia
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Default Capacitor question

Hi Guys
It's my first post. Got a question, as diyers we all go to great lengths
to match resistors, transistor etc for our projects right but I have not
come across any articles about matching capacitors be it film or e caps.
Generally tolerance is given at +- 20 % but from my understanding this
tolerance only refers to voltage so does this applies to capacity as well and
what about esr do caps vary that much in tolerance. This might sound
goofy but I do notice that SQ is affected when changing caps of the same
brand, same voltage & same capacity. So much so that even sound
stage is affected too and this is happening after 50 hrs of burn in. These
caps are audiophile caps & not the el cheapo types. Would be great if some
experts here can shed some light to this

Thank you
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Old 8th September 2016, 09:21 AM   #2
AndrewT is offline AndrewT  Scotland
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the voltage does not have that 20% tolerance.
The capacitance can have a tolerance from 0.3% to +50% -20%
esr and other parameters are as defined in the specification and rarely have a tolerance attached. Just upper or lower limits.
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Old 8th September 2016, 09:51 AM   #3
sumotan is offline sumotan  Indonesia
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Hi AndrewThank you for the prompt reply so my understanding is incorrect then. Lol
Having said that is there a way to match capacitance of caps ?


Thanks
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Old 8th September 2016, 10:35 AM   #4
SY is offline SY  United States
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Capacitor question
Yes, use a capacitance meter. For matching, the absolute accuracy isn't as important as relative accuracy (repeatability). Under $15 at EBay.
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Old 8th September 2016, 10:48 AM   #5
sumotan is offline sumotan  Indonesia
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Thank you SY yes I just found that out . Lol
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Old 8th September 2016, 11:12 AM   #6
DF96 is offline DF96  England
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For most caps (e.g. coupling, decoupling) matching is not needed - assuming competent circuit design. Matching is needed for filter caps in a stereo system - the important thing is to get the same value in each channel, not necessarily exactly the value calculated by the designer. Don't buy 'audiophile' caps, as these are merely an efficient means of money transfer. Instead, for filter caps, buy twice as many as you need and choose those which are nearest to each other in value.

If the sound changes when you change a cap to another which is nominally the same then the most likely explanation is a change in value - possibly combined with poor circuit design. If it was an audiophile cap then poor quality may be another issue.

By the way, we often don't "go to great lengths to match" resistors as 1% is good enough and generally far better than we can match caps.
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Old 8th September 2016, 11:25 AM   #7
sumotan is offline sumotan  Indonesia
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Thank you DF 96 yes your right on the money notice SQ differenceon split power supply on either analog input or output of either amps
or dac. As with don't buy audiophile cap comment Im afraid I can't be
in agreement . Im not an expert in electronics but as far as caps are concern
I believe I've play with more then enough to comment. Every cap be it generic
or boutique has a sound signature & it is this familiarity that allows one to mix
& match to tailor the sound to once flavor if I may add. Like it or not, as long
as caps are in the circuit be it decoupling or coupling, they will add a signature
more so in analog stage.


Many thanks again for the advice
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Old 8th September 2016, 12:54 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by sumotan View Post
Thank you DF 96 yes your right on the money notice SQ differenceon split power supply on either analog input or output of either amps
or dac. As with don't buy audiophile cap comment Im afraid I can't be
in agreement . Im not an expert in electronics but as far as caps are concern
I believe I've play with more then enough to comment. Every cap be it generic
or boutique has a sound signature & it is this familiarity that allows one to mix
& match to tailor the sound to once flavor if I may add. Like it or not, as long
as caps are in the circuit be it decoupling or coupling, they will add a signature
more so in analog stage.


Many thanks again for the advice
If you operate a capacitor as a filter then different types will sound and measure differently.
If the wrong type of capacitor is chosen for a particular duty, then the performance of the circuit is likely to be measurably different.
If you choose the wrong value of the correct capacitor type, then the performance of the circuit is likely to be measurably different.
Correct operation of the circuit requires the Builder to select the correct type to suit the duty and the correct value to suit the operation.
Sound quality then falls out of the equation - the circuit operates as the Designer intended it to.
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Old 8th September 2016, 01:09 PM   #9
TonyTecson is offline TonyTecson  Philippines
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Capacitor question
or different values of caps will surely sound different....
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Old 8th September 2016, 01:57 PM   #10
sumotan is offline sumotan  Indonesia
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Hi GuysBe it in the signal path or not Sq will still be affected either with different values or different brand.
An example Im now meddling with a Buf03, decoupling to the Buf03 is a 470uf cap. This is a straight forward layout nothing to actually design to make the Buf03 work. Just by changing different brands of cap here will have a profound difference in SQ.
In theory on digital side caps used should have no affect on SQ as long as the caps are
correctly chosen for the application but then again its does affect SQ. So here again I've
opened another can of worms. Probably there's goona lots of different views but for me
it's all about trying out & listen to what changes in SQ when substituting caps


Thanks for sharing your opinions & experience
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