Mark Willis wrote:

> A second fuse is redundant, really, IMO (so far.)  Maybe you can
> convince me, though?  <G>

  I thought the battery was there as a glorified Zener?  If the fuse or
Polyswitch opens because it happens to be subjected to a ridiculous
over-voltage (60V or 100V) and you have the regulator connected to the
source side of the fuse, does not the regulator and possibly your
circuit-to-be-protected begin to develop smoke enuresis ever-so-shortly
afterward?
--
  Cheers,
        Paul B.