Seems to me a JFET input op-amp with high gain and a nice
loop antenna tied to it would be wonderful for that.  Haven't seen
an IC specifically for doing that, though.

Mike H.

On 4/13/06, William Chops Westfield <westfw@mac.com> wrote:
>
> On Apr 13, 2006, at 6:11 PM, Peter Todd wrote:
>
> >> In particular, can I make reliable lithium power-fail
> >> safety lights that I can just stick to a wall anywhere in the
> >> average USian home?
> >
> > You should look up Quantum Research Group's QTouch series of ICs,
> > for instance the QT110 chip. They work by measuring the
> > capacitance change when someone touches an electrode.
>
> I'm not looking for a touch switch this time.  I'm looking for
> something that can detect power failures without being connected
> to wires...
>
> BillW
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