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![Pin configuration of MT8870 DTMF decoder 2.2.1 DTMF Decoder Circuit](https://i2.wp.com/www.researchgate.net/profile/Bernard_Okon/publication/307477088/figure/download/fig1/AS:401080581148674@1472636470791/Pin-configuration-of-MT8870-DTMF-decoder-221-DTMF-Decoder-Circuit-Unit-design-Figure-6.png)
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![embedded - Multiple DTMF circuits able to detect the pressed keys but](https://i2.wp.com/i.stack.imgur.com/TUXac.png)
embedded - Multiple DTMF circuits able to detect the pressed keys but
![DTMF Decoder Circuit | Cell, Microcontrollers, Phone](https://i.pinimg.com/originals/19/24/a5/1924a5d214836c6e77e2736004d6253a.png)
DTMF Decoder Circuit | Cell, Microcontrollers, Phone
![DTMF Based Remote Control System](https://i2.wp.com/bestengineeringprojects.com/wp-content/uploads/2015/02/circuit-diagram-of-dtmf-coder.png)
DTMF Based Remote Control System
![Dtmf Decoder Circuit Diagram Explanation - Circuit Diagram](https://i2.wp.com/www.electronics-diy.com/schematics/1074/dtmfdecoder_pcb2.gif?strip=all)
Dtmf Decoder Circuit Diagram Explanation - Circuit Diagram
![DIY - DTMF Tone Generator and Decoder Circuits](https://i2.wp.com/www.engineersgarage.com/wp-content/uploads/2019/07/Circuit-Diagram-MT8870-IC-Based-DTMF-Decoder.jpg)
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![DTMF & Arduino: answer, listen for code, reply. - Project Guidance](https://i2.wp.com/www.electronics-diy.com/schematics/1074/dtmf-decoder-schematic.gif)
DTMF & Arduino: answer, listen for code, reply. - Project Guidance
![DTMF 8870 Circuit Explanation](https://i2.wp.com/www.qsl.net/oe3mzc/mt8870.gif)
DTMF 8870 Circuit Explanation