[sdiy] Where to buy ceramic caps

Mattias Rickardsson mr at analogue.org
Sat Dec 30 11:56:56 CET 2017


Assuming you are designing for audio, isn't 3 Mohm a bit too noisy?

/mr


Den 30 dec. 2017 10:39 skrev "David G Dixon" <dixon at mail.ubc.ca>:

> So, after much cogitation, I'm thinking that I may just do this the other
> way round.  Instead of trying to keep my resistances within a certain range
> (around 30k) with all different capacitor values, I could use the same
> capacitor value for all 12 stages.
>
> If I used 10nF, then the resistances would range from about 374 ohms to
> about 3.01M.  These values fall within the range where I could use one or
> two standard 1% resistors to achieve the value within about 0.01% of the
> target.  The advantage is that 10nF falls within the range of C0G caps,
> which are standard 5% tolerance (and often significantly better).  Plus,
> there is the added convenience of only having to deal with one value of
> capacitor.  I could buy a pile of these (I can get them for 12 cents apiece
> at my local shop) and sort them into groups.  This is a value that my DVM
> reads quite accurately, so that's easy enough to do.
>
> The beauty of this is that I can actually build it in different ways and
> try
> them out.
>
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