RotaryCell: Making an unmodified rotary phone work over LTE with an ESP32-S3

Post by wpm » Wed, Sep 02, 2026, 1:24 AM UTC

mikeweiss wrote: post #18

ralferoo wrote: post #14

Accepting 5V over the RJ-11 jack seems asking for trouble. Someone is going to plug it into a regular phone socket at some point, so it needs to be capable of surviving at least 60VAC. Even if a secondary pair is used, there are so many different wiring standards in use, it'll end up plugged into something live sooner or later.

Dunno about you but I don't know anyone with live RJ-11 jacks in their house anymore.

Post by ssl-3 » Wed, Sep 02, 2026, 6:23 PM UTC

K0balt wrote: post #48

ssl-3 wrote: post #26

Earlier quoted context omitted.

What are the chances of this telephone falling out of the sky due to battery failure?

I was going to say pretty low but then I realized you weren’t just be ing snarky lol I got this article conflated with another I was reading. My apologies to all. Still, if you don’t want your phone to fall out of the sky, Put it on a drone with proper battery limit discipline.