DTMF Decoder and Phone Audio Matrix Switching
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- Опубликовано: 27 сен 2024
- Playing with a revised DTMF decoder MT88L70 3.3v power/GPIO, and audio matrix switching.
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Using a 3.3v powered DTMF decoder makes it easier to interface directly with ESP32 compared to the 5V version, which requires level shifting.
The ongoing phone line experiments may expand between just two node direct interfacing.
An MT8808 8x8 analog crosspoint switch is being tested to see if phone line audio can be routed between channels. This may enable a central coordinator to manage call requests and phone line routing between multiple nodes, including multi node party line call connections.
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This would be some really useful knowledge if say, comms were down.
You could essentially have comms between some tight knit friends, and private.
Way beyond my base of skill and know how, but very cool, none the less!
TTL outputs SHOULD be 5 volts.. 3v3 is just lame :D
cool project, Captain Crunch would be jealous I'm thinking...
if we had battery powered Arduinos and some knowledge a couple of decades ago it would’ve been a lot cheaper making calls from pay phones
Does Captain Crunch know about Cap'n Crunch?
very nice a microcontroller pbx with the switching. Could even add a voice prompt with the little voice boards breakout boards or even an old 80s voice chip. Nice to see a solution outside of raspberry pi.