Just curious, why do most wired doorbells need a transformer, with the asso= ciated hassle of wiring from a mains source to the tranformer and then to t= he bell, when they could just as easily use a 9V battery in the sounder uni= t instead?
I presume there's a good reason, just I'm too much of a numpty to work it o= ut for myself.
I know there are some battery only devices, but they are all horrible and d= on't meet SWMBO's audio requirements nor visual aesthetic requirements. An= d 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 sor= t of ring for SWMBO!).
Matt