Sound Frequency Sensor Module Sound Activation LM567 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. Note: make sure VCC and GND is not reverse (can damage ic) 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 1. Power up, power LED up 2. Choose and use a fixed voice source, which is the one for identifying, keep it continuously output. 3. adjust adjustable resistor, until indication LED on 4. turn off sound source, Signal indicating LED off, now the calibrating is finish. We suggest to use the software called audioSCSI which can output a fixed frequency to your computer. Mengenalkan Sound Activation: https://www.facebook.com/notes/indoware-elektronik/sound-activation-dengan-ic-lm567/743292299023388 http://blog.indo-ware.com/?tf=news amp;aksi=lihat amp;id=87 Album Produk: https://www.facebook.com/media/set/?set=a.735019339850684.1073741875.383734711645817 amp;type=3 video pengujian http://www.youtube.com/watch?v=tu8ULmZ2V5U https://www.youtube.com/watch?v=LeA6CtHa6Sw https://www.youtube.com/shorts/R9SJEeF07IU https://www.youtube.com/watch?v=_aR8R-oVqTw https://www.youtube.com/watch?v=ZZ2QuJgy7ZY Adjustable Frequency Identification voice module, provided example at 1KHz voice recognition, only 1KHz frequency sound to trigger the LED, sound of the other frequencies will be filtered out. Features: On-board frequency discriminator can identify the audio signal of a fixed frequency.