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Old 24th August 2012, 01:02 AM   #31
Tenson is offline Tenson  United Kingdom
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Dragging up an extremely old thread; is it worthwhile using NP0 type caps for bypassing op-amp supply rails, as opposed to more common ceramic caps like X7R? Is the difference only really shown in the audio signal path?
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Old 24th August 2012, 01:05 AM   #32
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I'd bypass them. The better ceramics clean up supply rail fluctuations better.
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Old 24th August 2012, 11:43 AM   #33
AndrewT is offline AndrewT  Scotland
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the x7r are probably working just fine.

I can't see what advantage an NP0 could bring in local decoupling.
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Old 24th August 2012, 11:52 AM   #34
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My understanding is that X7R caps are "lossy" and NP0 are not. The lossy quality of the X7R is what makes it good at suppressing noise.
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Old 24th August 2012, 12:24 PM   #35
DF96 is offline DF96  England
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Yes, that is my understanding too. The slight RF lossiness of the bigger ceramic caps means that parasitic impedances and resonances in PCB traces are not merely retuned (as an NP0 would do) but damped away. As always, use the appropriate cap for the job and ignore myths and fashions about 'good' and 'bad' audio caps.
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Old 24th August 2012, 01:10 PM   #36
Tenson is offline Tenson  United Kingdom
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Thanks for the replies!
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