On 01/17/2016 03:19 PM, Don Y wrote:

[snip]

It's a delightfully simple circuit: power -- switch -- bell -- back to
power
yet can be *******ized in countless ways! And, you don't want the
homeowner
to have to make changes -- just *mount* the bell, ideally (and touch up
any paint around it)

How about 2 buttons in series, each with a diode across it (opposite
polarity)? With no button pressed, no current flows. Press either
button, and current flows. Polarity depends on which button was pressed.
Now you have a 2-door doorbell with less wiring.

--
Mark Lloyd
http://notstupid.us/

"Happiness is the only good. The time to be happy is now, The place to
be happy is here." --R.G. Ingersoll