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dtmf decoder

  1. M

    Can MT8870 DTMF decoder module handles none audible signals?

    Hi great members, I've a question that never been answered. I'd like to use DTMF decoder with 8870 chip but before I order it globally, I tested normal calls between cellphones and no DTMF detected and after some research I got that mobile network is transmitting DTMF as digital signals...
  2. S

    Problem with KT3170 DTMF Decoder

    I am attempting to make a circuit with the KT3170 chip. Outputs from chip sent to Arduino pin. Arduino will receive 4 numbers and display them on the LCD screen. It's working But sometimes the Arduino will take the value from a number 2 times. Like I dial 1 . Arduino will receive a 11 . I...

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