using .1 or .01uf for decoupling capacitor? - diyAudio
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Old 16th December 2012, 03:24 PM   #1
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Default using .1 or .01uf for decoupling capacitor?

I would like to use .01uf polystyrene capacitor for Decoupling in psu and near the amplifier pins instead of .1uf polyster film cap would that create any problem? can I go with .01uf cap instead of .1uf?what could be the drawbacks?
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Old 16th December 2012, 05:05 PM   #2
AndrewT is offline AndrewT  Scotland
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Too big to get in close.
Use a 0.1 ceramic, but NOT C0G.
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Old 16th December 2012, 05:07 PM   #3
RNMarsh is offline RNMarsh  United States
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Use the 0.1Mfd. -RNMarsh
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Old 16th December 2012, 05:28 PM   #4
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does the type of the capacitor affects the quality of sound? at decoupling? like ceramic, polyster film (box) which is pretty commonly used, polypropelene? upto what factor it makes difference?
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Old 16th December 2012, 05:33 PM   #5
AndrewT is offline AndrewT  Scotland
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high esr to reduce risk of ring.
very small size to allow very short routes.

It seems that you are still not reading the relevant posts on the Forum.
Members take time to post on this Forum.
It seems to be normal to read what is being posted.
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Old 16th December 2012, 06:26 PM   #6
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i agree but wanted to know if somebody has bad experience using .01uf... or .1uf paralleled with .01uf?
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Old 16th December 2012, 06:36 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Add the smaller capacitor in parallel with the standard decoupling capacitor.
Upping the standard decoupling capacitor values is also a valid option.

rgds, sreten.
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Old 16th December 2012, 06:58 PM   #8
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just now installed the .01uf styroflex now the upper mids and highs have more layers... thank you...
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Old 17th December 2012, 01:14 AM   #9
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Quote:
Originally Posted by rhythmsandy View Post
does the type of the capacitor affects the quality of sound? at decoupling? like ceramic, polyster film (box) which is pretty commonly used, polypropelene? upto what factor it makes difference?
The purpose of the typical 0.1 uF (usually ceramic) as a local decoupler is not to provide soundstage or "layers" as you claim. The purpose of that capacitor is to make the amplifier less prone to high frequency instabilities. As such, it is wise to heed Andrew's advice regarding "very short routes". You should solder it directly to the supply pins on the bottom of the board. Keep the leads short and clip all excess. A good capacitor keeps its legs together.

Quote:
just now installed the .01uf styroflex now the upper mids and highs have more layers... thank you...
You can certainly experiment around with different local "audio quality" bypass caps in an attempt to provide more "clarity" "soundstage" "layers" etc. Try bigger values and follow above advice regarding short routes etc for best results. But leave the 0.1 uF ceramic in place. You need it for stability.
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Old 17th December 2012, 03:00 AM   #10
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i have used a kemet .1uf polyster capacitor in place did not take it out...

but believe me the purpose of the capacitor is completely different and I accept it.. but i dont know how its making that difference...
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