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Old 8th June 2012, 10:57 PM   #81
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rjm -

Interesting...

Is there anything special about the TDK ceramics you call out in your blog post??? I have quite a few Kemet ceramics (both C0G and X7R varieties); they should be ok shouldn't they???
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Old 9th June 2012, 01:10 AM   #82
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No, there is nothing special about them, they are standard x7r or the like, multilayer ceramics and anything similar should work just as well.
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Old 21st June 2012, 02:46 AM   #83
RNMarsh is offline RNMarsh  United States
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In order of good-better-best: X7R is not so good. COG is better and NPO is best as ceramics go. -RNM
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Old 26th June 2012, 02:21 AM   #84
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In order of increasing temperature stability ... and price.

Did you or anyone ever test whether this was actually an important (read: audible) feature when using the capacitor in bypass (not signal coupling) applications? I have vague recollections of seeing hysteresis loops on scope traces in an article I read years ago. Was that yours?
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Old 26th June 2012, 03:40 AM   #85
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The work of Cyril Bateman. X7R, X5R, Z5U, Y5V distord very bad, only NPO-COG are adecuated for audio:

Capacitor Sounds, Speaker Cables and Crossover Inductors.
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Old 26th June 2012, 05:02 AM   #86
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I guess what I'm asking is has anyone swapped X7R for NPO as bypass caps for an opamp and claimed to hear a significant improvement?
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Old 26th June 2012, 05:48 PM   #87
RNMarsh is offline RNMarsh  United States
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Many, many people and audio equipment manufacturers have heard changes reported over past several decades when bypassing on the power supply using differect cap dielectrics. I suspect it depends a lot on the circuits PSRR just how much affect it has. Many tube circuits seem to be more affected than IC's.
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Old 26th June 2012, 11:18 PM   #88
jcx is offline jcx  United States
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I recall one such audio bypass cap "tasting" test rated X7R bypass "better sounding" - at least while Blinding was in place

% distortion of the PS ripple shouldn't have much effect, only a very high Z PS ( == bad ) would let your circuit "see" bypass C dielectric effects at audio
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Old 27th June 2012, 08:47 AM   #89
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SE tube designs are not the usual place where one can find small smd capacitors

However I'm wandering. How is it possible to hear a difference in an opamp circuit that has over 100dB of PSRR? For PS bypass caps ner the IC pins I use X7R's and I'm perfectly happy with that. When I need a smd cap which is in the signal path I go straight to the film caps. Those are a bit expensive and bulky (most in 1206 or larger package). For the record - I don't have the golden years disease

Just my 5 cents. Regards, Venci.
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Old 7th July 2012, 06:42 PM   #90
RNMarsh is offline RNMarsh  United States
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It probably makes little difference... I havent listened, myself to that IC app you are describing. If it works for you, what else matters? I am saying - for readers here under a wide variety of conditions and circuits -that if you dont know what to do or what to use, go with the better caps rank listed to assure yourself of the best results.
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