We just love everything about this overengineered project - it’s clearly a labor of love, and the fit and finish really reflect that. Check out the video below for more on that - it’s pretty neat! A separate, special interface card provides an auto-patch capability using an RDA1846S RF transceiver module with it, can connect to any phone in the system from a UHF handy-talkie. The interface does the work of detecting when a phone goes off-hook, and does the actual connection between any two phones. The main board supports five line interface daughterboards, which connect each phone to the switch via an RJ11 jack. The private exchange is entirely scratch-built, with a PIC32 acting as the heart of the system, performing such tasks as DTMF decoding, generating ring voltage, and even providing a CAN bus interface to his home automation system. The idea is to support a bunch of old landline phones distributed around the house, and beyond, in a sort of glorified intercom system. And hacker admits that this is very much a “because I can” project.
Right up front, we’ll stipulate that there’s absolutely no practical reason to do something like this. This private analog phone exchange is not one of those, but it’s still a super cool build that’s probably about as ambitious as getting an old step-by-step or crossbar switch running. It doesn’t happen often, but every once in a while we stumble upon someone who has taken obsolete but really cool phone-switching equipment and built a private switched telephone in their garage or basement using it.
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