Electret Microphone Amplifier - MAX9814 with Auto Gain Control
Qty | Discount |
---|---|
1-9 | $7.95 |
10-99 | $7.16 |
100+ | $6.36 |
Description
Add an ear to your project with this well-designed electret microphone amplifier with AGC. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, we use the Maxim MAX9814, a specialty chip that is designed for amplifying electret microphones in situations where the loudness of the audio isn't predictable.
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, 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 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 1-100uF blocking capacitor in series (100uF sounds best).
For audio-reactive projects, we suggest using an FFT driver library (such as the one in this library) which can take the audio input and 'translate' it into frequencies. If you just need to keep track of audio levels, see our sound-level meter tutorial for Arduino
Each order comes with one assembled and tested board, with an electret mic pre-soldered on, and a small piece of header. Our tutorial will get you started with using and testing the microphone amplifier and you can check out our general-purpose microphone amplifier tutorial for other project ideas and code.
Electret Microphone Amplifier - MAX9814 with Auto Gain Control (0:25)
Technical Details
- Board Dimensions: 26mm x 14mm / 1" x .6"
- EagleCAD PCB, Fritzing object, datasheets and more in the tutorial
Revision History:
- As of December 12, 2022 – we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.
Learn


-
Pimoroni
United Kingdom -
Triopak Oy
Finland -
van alles en meer
Netherlands -
SpikenzieLabs
Canada -
Amicus Engineering Pte. Ltd.
Singapore -
Digi-Key Electronics
United States -
ABRA Electronics
Canada -
Optimus Digital SRL
Romania -
Mouser Electronics
United States -
Robofun
Romania -
Fab.to.Lab
India -
kjdelectronics
United States -
Go Tronic
France -
AndyMark
United States -
Gotron BVBA
Belgium -
Kiwi Electronics
Netherlands -
Electrokit Sweden AB
Sweden -
The Pi Hut
United Kingdom -
Makersify
United Kingdom -
Play-Zone
Switzerland -
GRobotronics
Greece -
3DMakerWorld, Inc.
United States -
NTREX, Inc.- Devicemart
South Korea -
BOTLAND B. DERKACZ SP.J.
Czech Republic -
BOTLAND B. DERKACZ SP.J.
Poland -
BerryBase
Germany -
Core Electronics
Australia -
Letmeknow
France
See our Distributors page for a complete list of distributors.