Re: How to find doorbell transformer
This is a bit "out there" and may not work, but if you have access to a tone generator and probe kit (used by telephone installers) you may be able to connect the tone generator to the wires at the bell or the button and use the probe to find out where the wire goes inside the wall. Eventually it should lead you to the transformer.
(I haven't tested this out. It was just a thought.)
By the way, DO NOT use the tone generator/probe on 120V circuits. The doorbell is low-voltage, between 12 and 16 volts.
If you want to buy a tone generator, they sell them at big-box home improvement stores, but you'll pay $50-150.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.