[sdiy] Supercaps!

[Magnus Danielson]

From: "Bert Schiettecatte" <bschiett at etro.vub.ac.be>
Subject: RE: [sdiy] Supercaps!
Date: Mon, 9 Aug 2004 01:04:27 +0200
Message-ID: <000b01c47d9c$0fd62880$0302a8c0 at etro.vub.ac.be>
> 
> -----Original Message-----
> From: Roy J. Tellason [mailto:rtellason at blazenet.net] 
> Sent: maandag 9 augustus 2004 0:58
> To: Bert Schiettecatte
> Subject: Re: [sdiy] Supercaps!
> 
> 
> > > Any comments? Suggestions? Super cap hate mail?
> > 
> > It would seem to me that the discharge curve with any nontrivial current
> > draw would be what would make such a use a not real terrific idea... 
> > 
> > That curve starts out darn near vertical.
> 
> Sure, but can't you circumvent that by using some circuit to boost the
> voltage and keep it regulated until the cap has discharged almost
> completely?

No. The boosting would draw considerably amount of energy too, so I think the
chance of long hold-out is just very slim. The thing is that the voltage
drops to low levels on the same time might you not eat much more current than
the PIC already does. Maybe someone could spend his greys on the issue, but it
is not instantaniously obvious that it should work, at least not to me. But
then, I haven't designed low-voltage, low-current switches.

Cheers,
Magnus