[sdiy] stocking up on CAPS

[Andre Majorel]

On 2005-10-03 21:59 -0400, peter mcquain wrote:

> I just ran out .22uF caps putzing around with Ray Wilson's White/Pink
> noise source, and am preparing to order more caps. I have lots of
> RF-appropriate values (33p, 470p, 220p, etc.) in silver mica and
> ceramic, plenty of .1 and .01's for decoupling and a good collection
> of electrolytics. My question is this: What would be a good range of
> values for poly/film caps to stock up on. Already on my list is .22uF,
> .47uF, and .001uF (1000n).

Here are the values used in a selection of 85 modules from CGS,
Oakley, Jim Patchell and Tellun :

  1 4.7p ceramic low-k .2"
  3 10p .2"
  2 10p ceramic .2"
  1 18p .1"
  1 18p .2"/.3"
  3 18p ceramic low-k .2"
  4 22p ceramic low-k .2"
  4 22p ceramic low-k plate .2"
  1 27p
  1 33p ceramic .2"
 17 33p ceramic low-k .2"
  7 33p ceramic low-k plate .2"
  4 47p .2"
  1 68p .2"
  2 82p .2"
 12 100p .1"
  6 100p .2"
  3 100p 1% polystyrene .2"x.2"
  2 100p ceramic .2" 
  1 100p ceramic low-k (np0/c0g) .2"
  5 100p ceramic low-k .2"
  8 100p ceramic low-k plate .2"
  1 100p ceramic plate .2"
  2 150p ceramic low-k (c0g) .2"
  2 150p ceramic low-k plate .2"
  2 220p .2"
  5 220p ceramic low-k .2"
  1 220p ceramic low-k plate .2"
  5 330p .2"
  4 470p .2"
  1 470p ceramic .2"
  6 470p ceramic low-k .2"
  3 470p ceramic low-k plate .2"
  1 470p ceramic plate .2"
  1 1n
  7 1n .2"
  3 1n 1% polystyrene .2"x.2"
 18 1n 100v polyester .2"
  2 1n 100v polypropylene .2"
  6 1n 50v polystyrene .5"
  5 1n 63v polyester .2"
  2 1n 63v polypropylene/polystyrene .2"
  5 1n polyester .2"|1n ceramic .2"
  1 1n polyester .2"
  3 1n polystyrene .6"
  6 1.5n .2"
  4 1.5n 100v polyester .2"
  4 1.5n 100v polyester film .2"
 11 2.2n .2"
  3 2.2n .2"/.3"
  6 2.2n 100v polyester .2"
  1 2.2n polystyrene .2"/.3"
  1 2.2n polystyrene .6"
  6 3.3n 100v polyester .2"
  4 4.7n .2"
  6 4.7n 100v polyester .2"
  1 4.7n 63v polyester .2"
  1 5.6n .2"
  4 6.8n 63v polypropylene .2"
  2 10n
 29 10n .2"
  2 10n .2"/.3"
  5 10n .2"/.3"/.4"
  6 10n 100v polyester .2"
  2 10n 50v polystyrene .5"
  3 10n 63v polyester .2"
  2 10n 63v polypropylene .2"
  1 15n .2"
  2 15n 100v polyester .2"
 12 22n .2"
  4 22n 100v polyester .2"
  4 33n .2"
  8 33n 100v polyester .2"
  1 33n 400v polyester .3"
  3 47n .2"
  4 47n polypropylene (low leakage) 0.3" or 0.4"
  5 100n
132 100n .2"
 25 100n .2"/.3"
 95 100n .2"/.3"/.4"
157 100n .3"
  8 100n 400v polyester .3"
 47 100n 63v ceramic .3"
 71 100n 63v polyester .2"
 36 100n ceramic .2"
 41 100n ceramic .3"
  2 100n ceramic multilayer .2"
 20 100n ceramic multilayer .3"
 16 100n ceramic multilayer c0g .3"
  2 100n polyester .2"
  1 220n
  1 220n .5"
  1 220n 63v polyester .2"
  1 330n .2"
  1 330n 100v polyester .3"
  2 470n 25v electrolytic .1"
  5 470n 63v polyester .2"
  1 470n polyester .2"
  4 680n 63v polyester .2"
  3 1u (mks) .2"/.3"/.4"/.5"/.6"
  3 1u .1"
  1 1u .8"
  2 1u 25v .1"
  4 1u 35v .1"
  2 1u 63v .2"
 18 1u 63v polyester .2"
  4 1u 63v polyester .3"
  1 1u polyester .2"
 14 2.2u 25v .1"
  4 2.2u 25v .2"
  1 2.2u 35v .1"
  2 2.2u 50v .2"
 17 2.2u 63v .2"
  1 2.2u 63v polyester .3"
  2 4.7u .1"
  3 4.7u 35v .2"
 22 10u .1"
  3 10u 25v
 66 10u 25v .1"
  2 10u 25v .1"/.2"
  6 10u 25v .2"
  5 10u 25v tantalum .1"
  4 10u 35v .1"
  2 10u 35v bipolar .1"
  1 10u tantalum .1"
104 22u 25v .2"					# Note 1
  2 47u .1"
  2 47u 25v .1"
  3 47u 25v .2"
  2 47u 35v .1"
  2 100u 25v 3.5mm
  3 100u 35v 3.5mm
  3 220u 16v .2"
  2 1000u 35v .2"/.3"
  2 2200u 35v .3"

Note 1: most of those are per-board bypass caps for Oakley
modules. Tony has said he switched to 2.2 µF because the inrush
current at power-on made his Power One PSU lock up.

-- 
André Majorel <amajorel at teaser.fr>
http://www.teaser.fr/~amajorel/