> > I've got four of their 820uF/63v caps on my furnace board. It's like > > a 3 second UPS :-) > > The 105C is a fairly big deal. Is that a 5,000 hour lifetime part?
Yes. I intentionally overspec'ed those because they're on the *furnace*. I.e. they're subjected to wider extremes than normal home-internal devices. Plus, I put four of them in parallel to cut down the per-cap ripple current (and to save space). > Not terrible, but marginal even for an alarm clock if you ask me. Hmmm... what's in the alarm clock... 220u alel = 2k hours, 85c 47u tant = 500k hours, 125c 150u tant = 500k hours, 125c 180u alel = 5k hours, 105c Note that the 220u doesn't have much ripple on it; it's the bulk cap for the wall wart. I suppose I could replace that with an FC if it dies, but even if it fails open the clock will still work. It's there mostly to guard against wiggling the power cord and interrupting the power for a split second. Of course, the clock *is* at room temperature all the time :-) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user