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 onboard 3V regulator so you can supply anything from 3.3 to 5V DC.
The board provides both DC and AC (via 10µF) coupled outputs to suit your audio equipment. When connecting to a microcontroller's analogue input use the DC coupled output. It won't drive speakers directly but it should work with in-ear earphones and of course it will drive an amplifier should you need speakers.
- AC and DC coupled outputs
- DC output 0.67V bias with 100mVpp signal
- 100Hz to 10,000kHz frequency response
- 3.3 to 5V DC power supply
- Dimensions: 15.8 x 14.1 x 2.9mm (0.6 x 0.6 x 0.1in.)
- Adafruit part no.: 2716
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