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Dual Tone Multi-Frequency: Circuit, Working, and Applications
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DTMF TONE DIALER
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MT8870 DTMF Telephone Dial Tone Decoder
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DIY - DTMF Tone Generator and Decoder Circuits
DIY - DTMF Tone Generator and Decoder Circuits
Dual Tone Multi Frequency (DTMF) - Signal Identification Wiki
DTMF (Dual Tone Multiple Frequency)
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DTMF Decoder / Encoder
What is DTMF (dual tone multi-frequency) and how does it work?