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Adafruit Electret Microphone Amplifier with Adjustable Gain

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Quoting product code: A87RK

£9.99

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About this product

Overview

  • Fully tested and assembled breakout board
  • All headers included (to solder yourself)
  • Great low-noise performance

Product overview

• Fully tested and assembled breakout board
• All headers included (to solder yourself)
• Great low-noise performance
• 20-20KHz electret microphone
• Maxim MX4466 op-amp for amplification
• Small trimmer pot on the back to adjust gain (25x to 125x)

Add an ear to your project with this well-designed electret microphone amplifier.

This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, we use the Maxim MAX4466, an op-amp specifically designed for this delicate task! The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amp breakouts we've tried!

This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT. On the back, we include a small trimmer pot to adjust the gain. You can set the gain from 25x to 125x. That's down to be about 200mVpp (for normal speaking volume about 6" away) which is good for attaching to something that expects 'line level' input without clipping, or up to about 1Vpp, ideal for reading from a microcontroller ADC. The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!

Using it is simple: connect GND to ground, VCC to 2.4-5VDC. For the best performance, use the "quietest" supply available (on an Arduino, this would be the 3.3V supply). The audio waveform will come out of the OUT pin. The output will have a DC bias of VCC/2 so when its perfectly quiet, the voltage will be a steady VCC/2 volts (it is DC coupled). Connect the OUT pin directly to the microcontroller ADC pin.

Regarding AC coupling what capacitor value do I need to connect to a ADC

Asked by: ELEC
I am sorry but we cannot give any product design advice regarding this , I am sorry for any inconvenience this may cause you.
Answered by: Darren
Date published: 2016-03-12
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