gEDA-user: Alarm clocks and switching regulators

[DJ Delorie]

> My bulk capacitors are Al electrolytics.  Speaking of board real
> estate -- yikes!  But how else am I going to get ~700uF of capacitance
> to deal with the 120Hz ripple?  (Without spending $30 each on
> high-tech capacitors, that is.)

Panasonic FC series caps.  680uF 63v is available in 12.5mm diameter
(35 mm tall!)  size.  Rated to 105C, they're only $1.35 at Digikey.

I've got four of their 820uF/63v caps on my furnace board.  It's like
a 3 second UPS :-)