dont know if anyone will see this, as this reply is to an old post, but what the hey
I've got a ID caller display unit that uses 3 AAA bats , thats 4.5volts, i've convertered the unit to be power off unit, so the unit has no batteries in it, its completely empty, i wired up the phone jacks outter contacts, which go to the 2nd phoneline in a house, the 2 inner ones are perfectly fine. Those connections are routed for power from the outer contacts directly into the wires that go to the batteries if there was any and that goes into powering the unit
I have somewhere else in my house a little 3 AAA battery pack holding them and wired up to the houses 2nd line,
so throughout the house on the 2nd line theres 4.5 volts available, is that ok to do that, would that be any risk of fire or warm up of wires ?
some history
long before i had done this, i had played around with, first i connected a 9V to it to see what happens,, then i tried a mono audio signal, that sounded good, then i tried a composite video signal, it had a little noise in it, then i tried sending the TV output coax signal along the wires, noise in that,
then i went to put the whole cable tv signal along it, that was total fuzz for the most partr, but worked more or less
but the caller id offline powering was something i could do with what i had learned, only 4.5 volts didnt seem like much,a nd it appears that the unit doesnt even use that much power anyway
so theres some history for you
is there RISK of fire or any RISK of any kind,