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![CTCSS - DTMF - Tone Decoder / Encoder - IW5EDI Simone - Ham-Radio](https://i2.wp.com/iw5edi.com/wp-content/uploads/2013/07/dtmf1.gif)
![DTMF, Dual Tone Multi Frequency, MT8870DE DTMF Decoder](https://i2.wp.com/www.electroniclinic.com/wp-content/uploads/2020/06/mt8870-interfacing-with-arduino.jpg?fit=1702%2C1014&ssl=1)
![Dual Tone Multi-Frequency: Circuit, Working, and Applications](https://i2.wp.com/www.elprocus.com/wp-content/uploads/DTMF-based-Decoder-Circuit.jpg)
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![DIY - DTMF Tone Generator and Decoder Circuits](https://i2.wp.com/www.engineersgarage.com/wp-content/uploads/2019/07/Prototype-MT8870-IC-Based-DTMF-Decoder-Circuit.jpg)
![Generate DTMF Tones Only Using Arduino - Arduino Project Hub](https://i2.wp.com/hackster.imgix.net/uploads/attachments/887152/arudino-wiring_schem_Rqwhm9u43t.jpg?auto=compress%2Cformat&w=680&h=510&fit=max)