DTMF Decoder Breakout

Cart add.png


The DTMF (Dual Tone Multiple Frequency) breakout boards decodes the key press from mobile phone to 4 digit binary code. If you've wondered how an IVR works when you call customer support, it uses an DTMF decoder. So whenever you press a key on your phone, it is decoded and it plays the pre-recorded messages. It can be used to control devices, move robots from a distance.


  • Based on MT8870 or compatible decoder.
  • Works in differential mode
  • Indication LEDs for the binary output
  • Output pins taken out.

How to connect?

The board has a standard 3.5mm audio jack with which you can connect to phone. You may buy the standard 3.5mm audio cable. .