Ahh, I get it, you mean a double layer cap like Kanthal Globar makes (I
think they are the "Maxcap" people). I haven't really kept up on that
stuff, but aren't those parts usually designed to provide microAmps over a
period of time? I also seem to recall that they take hours and hours to
charge.
They are amazingly small for what they do, but all the ones I have seen are
still battery sized (about .25 - .6 inches tall and about .5" across).
Best Regards,
-jjf
-----Original Message-----
From: Chris Faherty [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 11, 2000 6:59 AM
To: Palm Developer Forum
Subject: RE: Powering a device from the Palm III - knew I missed somethi
On 11-May-2000 Fitzpatrick, Joe wrote:
> Are you sure you mean .1 farad? Generally a digital bypass cap would be
> somewhere around .1 micro farad. I don't keep up on passive technology,
but
> a 5 volt electrolytic .1 farad cap would need to be about the size of a
> paint can. Actually, I'm not sure if it could be built. In not up on the
> latest materials and manufacturing tolerances.
Yup. They are called memory capacitors. Don't know how they do it but they
are very common, even Radio Shaft has one that is .22 Farad. They are
designed to preserve static RAM for several weeks; at least that's what I
used it for. The one from RS is a Maxcap brand, bought it in 1989 and it is
about the size of 3 stacked lifesavers. The one in the Palm is much
smaller.
We found a 3.3 Farad in some equipment and boy did it hold a charge!
/* Chris Faherty <[EMAIL PROTECTED]> */
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