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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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