> You can't drive the ringer unfortunately because it requires a much higher voltage to drive it, something like 48 volts I seem to recall. You can, provided y

> You can't drive the ringer unfortunately because it requires a much higher voltage to drive it, something like 48 volts I seem to recall. You can, provided you also add a boost converter [1] to generate the ring voltage from the input supply voltage. [1] https://en.wikipedia.org/wiki/Boost_converter https://en.wikipedia.org/wiki/Boost_converter