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DTMF Dialer Coding Table
National Semiconductor NS TP5088 Tone Dialer chip provides simple means DTMF generation and simple interfacing with uProcessor.
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DTMF Tone Decoder
This project displays telephone numbers decoded from tones. A microphone picks up the tones, a preamplifier boosts the signals, an SSI-202 DTMF chip decodes the tones, a Basic Stamp acts as an interface to an LCD display and also provides \"RS-232\"
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