Adafruit silicon mems microphone breakout spw2430 adafruit 2716 p the adafruit silicon mems microphone breakout uses a spw2430 tiny mems mic with a frequency range of 100hz to 10khz unlike a traditional electret microphone this mic doesn t require an amplifier or bias resistor it s all in the package it outputs approximately 100mvpp with a 0 67v dc bias which is good enough for a line level input the peak to peak voltage can go as high as 1vpp if the sound is very loud there s an onb