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Electret
welcome aboard > kit > sensors > electret microphone amplifier
- Supply Voltage: 2.4v-5v
- Output: Rail-to-Rail - up to to 5vp-p
- Frequency Response: 20Hz - 20 KHz
- Adjustable Gain 25x-125x
- https://www.adafruit.com/product/1713
The chip at the heart of this amp is the MAX9814, and has a few options you can configure with the breakout. The default 'max gain' is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground.
You can also change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500. The ouput from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog/Digital converter that is up to 3.3V input.
If you want to pipe it into a Line Input, just use a 1-100uF blocking capacitor in series (100uF sounds best).
src: adafruit.com
| guide | url |
|---|---|
| Adafruit AGC Electret Microphone Amplifier - MAX9814 | https://learn.adafruit.com/adafruit-agc-electret-microphone-amplifier-max9814/overview |
| MAX9814 Datasheet | https://cdn-shop.adafruit.com/datasheets/MAX9814.pdf |
| Adafruit: Tiny Arduino Music Visualizer Project | https://learn.adafruit.com/piccolo |
| Adafruit: Microphone Amplifier Overview | https://learn.adafruit.com/adafruit-microphone-amplifier-breakout/overview |