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Taidacent DTMF Decoder/Encoder Full Form Dial Tone Generator Dual Tone Multi-Frequency Audio Decoding Digital Display: Amazon.com: Industrial & Scientific
GitHub - dilshan/dtmfgen: Library to generate DTMF tones only using Arduino Uno.
DIY - DTMF Tone Generator and Decoder Circuits
Arduino DTMF Generator
DIY - DTMF Tone Generator and Decoder Circuits
Keypad DTMF Generator Module Audio Encoder Transmitter Board for Arduino UNO Pro | eBay