[sdiy] Where to buy ceramic caps

[Michael E Caloroso]

NOW you're getting it.

You may be able to avoid large megaohm values by halving cap values to
maintain the RC product.  Halving may be as simple as two caps in
series, which still allows the same value cap in the design paradigm.

MC

On 12/30/17, David G Dixon <dixon at mail.ubc.ca> wrote:
> 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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