How about something like this?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3D283-3015=
-ND

-marc

On Fri, Feb 5, 2010 at 1:54 PM, Isaac Marino Bavaresco <
isaacbavaresco@yahoo.com.br> wrote:

> Em 5/2/2010 15:56, Marc Nicholas escreveu:
> > All this talk of cheap UPSes is timely...
> >
> > I'd like to be able to provide a few seconds of +5vdc to a device so th=
at
> > when its main power line fails it gets to "finish what its doing" (which
> it
> > will if it is no longer being fed data, but needs a second or two to do
> so).
> >
> > Super or ultra caps come to mind, but I've never worked with them and
> some
> > casual Googling hasn't turned up too much of interest.
> >
> > Any suggestions on where to start or tips? Obviously I don't want to end
> up
> > with blown caps and/or blown device!
> >
> > TIA.
> >
> > -marc
> >
> > P.S: Oh, power draw for the device is 150mA nominal....so hoping I can
> just
> > do something with a Schottky, resistors and cap!
> >
> >
>
> This cap:
> <
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3DP10617=
-ND
> >
> is rated at 120000uF x 16V and costs just $12.50 @ unit.
> Charge it to 10V, use a buck regulator and it will last over 4s before
> the voltage drops to 5V, more if you charge it closer to its rated voltag=
e.
>
> Regards,
>
> Isaac
>
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