larkim used his keyboard to write :
Just curious, why do most wired doorbells need a transformer, with the
associated hassle of wiring from a mains source to the tranformer and then to
the bell, when they could just as easily use a 9V battery in the sounder unit
instead?

I presume there's a good reason, just I'm too much of a numpty to work it out
for myself.

I know there are some battery only devices, but they are all horrible and
don't meet SWMBO's audio requirements nor visual aesthetic requirements. And
wiring something up doesn't meet my requirements. (And wireless ones are
either crap, don't work in my house, look ugly or don't make the right sort
of ring for SWMBO!).

Matt

As others have said, most bell pushes have illumination which would be
a constant drain on a battery. Plus, batteries go flat without
informing you so you miss people at the door who have been stood there
ringing a defunct doorbell. Much, much better to have a transformer and
mains power.

For many years we've had the Freidland Underdome D792 bell and it does
exactly what it says on the tin. It's small, unobtrusive, but bloody
LOUD!!

I work from home and when our next-door neighbours (we live in a
semi-detached) are out during the day, or away on holiday, I love to
play my music (Led Zeppelin, AC/DC, The Who, Deep Purple etc., etc) at
very loud volume and was always missing deliveries/callers when we had
a namby-pamby 'ding-dong' type thing, but not anymore - this bell can
be heard all over the house, even when listening to Robert Plant and
the boys in full gusto lol