MAX9814 Electret Microphone Amplifier Board with AGC Function - Auto Gain Control Programmable Attack and Release Ratio Low THD - DC 2.7v-5.5v - 20mm x 15mm

Description:

This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, it uses 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 and '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 µF blocking capacitor in series.

Specification:

• Function:Microphone Amp

• Primary Attributes:Automatic Gain Control (AGC)

• Supplied Contents:Board(s)

• Type:Audio

• Utilized IC / Part:MAX9814

• This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT

• Automatic gain, selectable max from 40dB, 50dB or 60dB; Low Input-Referred Noise Density of 30nV/ - Low THD: 0.04% (Typ)

• Supply Voltage: 2.7v-5.5v @ 3mA current (can use Arduino 3.3V / 5V )

• Output: 2Vpp on 1.25V bias; Frequency Response: 20Hz - 20KHz; Programmable Attack and Release Ratio

• For the amplification, the module has built-in Maxim MAX4466