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Adafruit Electret Microphone Amplifier - MAX9814 with Auto Gain Control

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About this product

Overview

Product overview

• 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 change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500• The output 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 1uF blocking capacitor in series

This fancy microphone amplifier module is a step above the rest, with built in automatic gain control. The AGC in the amplifier means that nearby 'loud' sounds will be quieted so they don't overwhelm & 'clip' the amplifier, and even quiet, far-away sounds will be amplified.This amplifier is great for when you want to record or detect audio in a setting where levels change and you don't want to have to tweak the amplifier gain all the time. The chip at the heart of this amp is the MAX9814 (with it's datasheet in the downloads tab), 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 change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500. The output 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 1uF blocking capacitor in series. For audio-reactive projects, we suggest using an FFT driver library found hereWhich can take the audio input and 'translate' it into frequencies.

with an electret mic pre-soldered on, and a small piece of header. Adafruits tutorial will get you started with using and testing the microphone amplifier and you can check out their general-purpose microphone amplifier tutorial for other project ideas and code

I need adjust the agc values. Can you please advise where MICBIAS (pin 13) and TH (pin 14) pins are on the pcb.

Asked by: Robert
This information is detailed in the Technical datasheet which is available from the download tab on the products webpage, if you do need any in-depth Technical support please feel free to give us a call on 0333 400 9500 or email us on technical@maplin.co.uk
Answered by: Russell
Date published: 2017-05-28

what is the power supply required and current consumption 

Asked by: RonB
Full information can be found in the link below. https://www.adafruit.com/products/1713
Answered by: Dominic
Date published: 2015-12-18

does this pre amp have a mic on the pcb? Thanks CC

Asked by: abcde
Yes that's correct.
Answered by: Dominic
Date published: 2015-07-17
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