What is DTMF (dual tone multi-frequency) and how does it work?
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What is DTMF (dual tone multi-frequency) and how does it work?
DTMF - Wikipedia
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What Is DTMF?
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DTMF - Wikipedia
DTMF
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HOW TO - Make a DTMF phone dialer - Make:
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DTMF Tones and Signaling Explained
Bell Telephone DTMF dial and phone schematics
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