06-27-2023, 02:32 PM
(06-27-2023, 02:25 PM)user328 Wrote: I'm gonna get a cheap 9VDC wall wart and wire it to the yellow and black wires in a regular telephone cable
That's actually exactly what a dc power supply is. The phone just has a transformer coil in it. So you would not save any power, and it would not be as safe, without fuses and what not.