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Pin Configuration

  • GND - GND
  • VCC - VCC, 3-12V, DC, use 5V directly is fine
  • OUT - output, when detect certain frequency output TTL low
  • FIN - Identifier frequency input, this can input the frequency for identifying, be aware the amplification should lower 0.2V
  • FOUT - Identifier frequency output pin, this pin output the identifying frequency which is set
  • ROUT - Amplifier real time output pin, detect audio amplifier signal real time output.


  • make sure VCC and GND is not reverse
  • Use adjust resistor, make sure the indicating LED off and then start to use, since there is noise in the environment, so you have to set the noise to a small frequency area.

How to use

Steps Note -
Power up power LED up -
Choose and use a fixed voice source, which is the one for identifying, keep it continuously output. use phone app, recommanded 500KHZ, less noise to ear -
tuning trim pot, until singal indication LED on
  • counter clockwise turn for high HZ, clockwise turn for low HZ
  • the trim pot has no stop, and reach limit after 15 turns, so when you turn 15 turns, try reverse direction.
  • trim pot only reach the frequency in a very small range, and LED on
  • Do not turn too fast, and keep close to sound source, otherwise can miss the frequency.
  • keep microphone board close to sound source
turn off sound source, Signal indicating LED off, now the calibrating is finish. - -

Suggest to use the software called

  • audioSCSI which can output a fixed frequency on PC end
  • Audio test ton generater or frequncy sound generator on android.