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to do with DTMF


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Hello, I was just wondering if anyone knows where I can get plans to make a portable DTMF Decoder :)
I tried searching and found nothing.. What I would like is that the device that hearing a DTMF tone prints it to a little LCD display.  It’s just an idea..  If there anything like that great if not I better start learning and maybe in a year or so I can start working on something.. ;D

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