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DTMF Decoder:

This board decodes DTMF signal either from an audio source or phone line to 4 bit binary TTL(5V) level output. It also indicates outputs with LED. Can use directly with microcontrollers to develop various DTMF related applications like remote monitoring, remote control, Caller ID, Auto Dialer.


  • Decodes DTMF as 4 bit binary
  • TTL level output for direct connection to microcontrollers 
  • Low power 5V DC operation 
  • LED indication of outputs 
  • Simple to use 
  • Based on excellent HT9170 IC 


  • Remote Control systems 
  • Caller ID applications 
  • FM receiver based remote control 
  • Remote control using Mobile phone