On Tue, 13 Oct 2020 13:22:10 +0100, T i m wrote:

Maybe an audio 'repeater' in / behind the bell push (cellphone
speaker?) would be better than a LED, even if it was only a momentary
'Beep', as you pressed the button?

I think a beep when button pushed is a better indication that the
button has worked than a flashing LED.

How about a self resonating magnetic(*) beeper across a resistor in
series with the bell push? Resistor value "adjusted on test" to drop
enoough volts for the beeper but not to stop the ding-dong
ding-donging.

(*) Magentic as I'm not sure how tolerant a piezo beeper would be to
the back EMF from the ding-dong- solneoide.

--
Cheers
Dave.