CCCAC:Projekte/OctoCore/Telephone

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I'm not sure, never really poked around this, but i think this Chip (a Low voltage transmission circuits with dialler interface) looks very interesting. The last example in it's datasheet has a complete schematic for a simple phoneline interface with DTMF and Microphone in.

Von „http://altes-wiki.aachen.ccc.de/CCCAC:Projekte/OctoCore/Telephone“