[sdiy] Nice info on decoupling caps

[ASSI]

On Saturday 21 January 2012, 13:42:02, Harry Bissell wrote:
> Wow thanks for these links. I just got a real booster course in decoupling
> capacitor understanding.

You are welcome.  I almost didn't post it, but now I'm glad I did.

> WHY Y5U capacitors SUCK !!!  (we know they did, but did ~you~ know ALL the
> reasons why ? ... hint, its NOT just temperature stability...)

Well, they are perfect for what they were designed, but that hasn't stopped 
anybody from using them for things they are bad at.  BTW, all high-k 
ceramics are to varying extent piezo- and even pyro-electric.

> HAH !   And I thought I was pretty knowledgeable about decoupling caps.

One can never know too much.

As an additional remark, I didn't list any of the excellent Application 
Notes on decoupling techniques various manufacturers have published (there 
are about a handful from each of the big analog names).  That doesn't mean 
you shouldn't read them, quite to the contrary.  I haven't included them in 
the list because they often are only available as PDF and the links can get 
unwieldily long.  Also, you'll often find nuggets of wisdom in Datasheets 
and IC Application Notes.  If the author(s) even go to such lengths as 
specifying a manufacturer part number for a capacitor (thinking of some of 
late Jim Williams' stuff), that should give you pause to think before you 
decide to do it differently.

To get some SynthDIY back into this: Don Buchla had a lot of reason to write 
"no substitutions!" next to many capacitors in his schematics.


Regards,
Achim.
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