Description 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. Onboard amplifier, microphone sound 100 times magnification, and the output from the connector pins. The input frequency range of 300Hz to 20KHz. (20Hz – 20Khz is audible for human ear) Distance :0-5m, this parameter depends on the decibels of the sound source. 5 V DC power supply; The frequency discriminator identify the frequency output of the frequency discriminator. Set up another to set the frequency, the output of the switch. Precision multi-turn potentiometer to adjust the frequency. Compact size: 38 X 18mm, saving space. 3mm screw holes for easy installation. Documentation on this page.
