Re: Incorrect bell?
The idea of using the ringing current to switch another power supply to supply the bell with about the same amount of energy as what is coming down the line anyway seems a bit over-complicated!
If you have a mains transformer in your parts drawer (any voltage output will do just for a first test; if your transformer has a centre tap, try end to end and centre to end), try connecting the secondary of that to the bell terminals, and the primary between pins 3 and 5 of the RJ-431. Even an old loudspeaker transformer from a valve radio might work, at least just for a try.
The trembler contacts rely purely on magnetic attraction, not repulsion, so polarity should not matter -- but this is the real world, where not everything pays any mind to "should". Try using a bridge rectifier, if you can't get the bell to operate satisfactorily from AC.
A ringing phone line is an energy-limited source; so the worst that is likely to happen is, it won't ring on an incoming call and it will pull down the voltage so much that none of your other phones on your line ring, either.
Have fun experimenting!
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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