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Electronics Symentics
Duel Tone Multi Frequency Circuits
DTMF Coder Makes Low Cost Sine Wave Generator: 10/13/94 EDN-Design Ideas
DTMF Generation With 3.58 MHz Crystal: National Semiconductor Application Notes first published05-Aug-1995
DTMF Generator / Decoder: tutorial with example circuit diagrams
DTMF Products for you: DTMF decoder can be powered from a 9V battery or from your parallel printer, schematic and windows demo program, design by Schmidt Technologies
DTMF Proximity Detector:
DTMF Tone Decoder: hears touch tones and displays them as telephone numbers.
Dual Tone Multiple Frequency DTMF: National Semiconductor Application Notes first published04-Nov-1995
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