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SparkFun Electret Microphone Breakout
project on project

Inflate with a Broken Balloon
by HomeMadeGarbage

Description: This small breakout board couples an Electret microphone (100Hz–10kHz) with a 60x mic preamplifier to amplify the sounds of voice, claps, door knocks or any sounds loud enough to be picked up by a microcontroller’s analog-to-digital converter. Each breakout comes fully assembled and works from 2.7V up to 5.5V.

The Electret Mic Breakout translates amplitude (not volume) by capturing sound waves between two conducting plates (one a vibrating diaphragm and the other fixed) in the microphone and converting them into electrical waves. These electrical signals are then amplified and picked up by your microcontroller’s ADC.

Get Started With the Electret Microphone Guide!


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Customer Comments

  • What is the Output Impedance of this? Will it work if connected directly to a PC Soundcard? How about the Electret Microphone itself?

  • Can this be used as a drop-in replacement for adafruit’s model (

    • I don’t see why not - we do use a different op-amp for the pre-amplifier and we do not have selectable gain. Our specs a slightly different…just depends on your application and your gain requirements.

  • How do i configure this to pick up only small breathing sounds? It seems like once I make a sound it keeps logging the knock knock even if I have the volts >= 2.0 && volts <= 3.0

  • Is the output centered on 0?

  • How is this different from BOB-09964?

    • This is a revision of that product. They still have the same function but the revision has an updated filter for better performance. There is also a tutorial with a couple example projects and more projects to follow in early July.

      • Got it, thanks! I’m always curious what’s different when there’s a new revision of a product.

Customer Reviews

5 out of 5

Based on 3 ratings:

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1 of 1 found this helpful:

Easy to use. Sensitive

As a “Mr. Wizard” experiment with the kids we set out to measure the speed of sound. Previous attempts used a firecracker to interrupt/allow a laser beam, because a very loud noise was needed to detect the arrival of the sound. With the electret microphone breakout I was able to easily detect the sound of a popping balloon. Now I can do the experiment legally and accurately.

John Gardner

1 of 1 found this helpful:

Higher sensitivity than the MEMS microphone

Developed a white noise system for our Advance Physics Lab for the students to explore.long data sampling. Have several different diameter tubes with different lengths and placed a speaker at one end that is powered by a white noise generator and the other end the SparkFun Electret Microphone Breakout that is then connected to digital oscilloscope. The digital oscilloscope takes a long data record 2-Mega-points and an FFT is performed to find the resonant frequency of each of the tubes. The SparkFun Electret Microphone Breakout worked very well for this and will be using it in more labs.

Related Tutorials

Electret Mic Breakout Board Hookup Guide

June 23, 2016

An introduction to working with the Electret Mic Breakout Board.

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