A microphone module with a small electret capsule. Output ‘DO’ (active
high) is switched when the sound level exceeds a preset level. A pot allows
adjustment of the level. The analog output signal is available at the ‘AO’
pin. Except for the smaller size of the capsule and its lower sensitivity the
module is identical to the ‘Big Sound’ module.

Working voltage: DC 4-6V Interface definition: AO: analog output sensor GND: ground VCC: Power supply input range: 3V-24V. DO: Digital Output (comparator output)