> Is there an off-the-shelf solution for a doorbell that uses light 
> and maybe
> even emits a loud sound? Preferably wireless, and easy to install by 
> a
> non-professional.

As people have noted, they certainly exist. Can even be bought here on 
the bottom of the world :-).

For even better results I've seen a normally closed relay contact with 
a plug to fit a home lighting circuit fuse holder. A fuse can be 
installed in the plug in unit. I've seen this used with both doorbell 
and telephone input. When the relay is operated at ringing cadence the 
lights flash. Better used with incandescent bulbs rather than 
fluorescents / CFLs :-).

Most exciting was when someone inadvertently plugged a TV into the 
lighting circuit :-). When the phone rang the TV would go berserk. Got 
their attention. Hard on the TV no doubt.



            Russell
 

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