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On the back, we include a small trimmer pot to adjust the gain.
The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!
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.
Using introduction:
Connect GND to ground, VCC to 2.4-5VDC.
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).
If the audio equipment you're using requires AC coupled audio, place a 100uF capacitor between the output pin and the input of your device.
If you're connecting to an audio amplifier that has differential inputs or includes decoupling capacitors, the 100uF cap is not required.
The output pin is not designed to drive speakers or anything but the smallest in-ear headphones- you'll need an audio amplifier (such as 3.7W stereo amp)
If you want to connect the amp directly to speakers. If you're connecting to a microcontroller pin, you don't need an amplifier or decoupling capacitor - connect the OUT pin directly to the microcontroller ADC pin.
For audio-reactive projects, we suggest using an FFT driver library which can take the audio input and 'translate' it into frequencies.
Package Included:
2* MAX4466 Electret Microphone Amplifier Module
Eric Kelly
Reviewed in the United States on October 20, 2023
Prompt service. I ordered these for a students project. Unfortunately I threw the package away and had to reorder. Second order arrived quickly. No issues with devices. Student has will install next week.
beethoven2493
Reviewed in the United States on July 23, 2022
This little package worked *great*, and there was even a datasheet available online somewhere. But I could not for the life of me figure out the sensitivity control and the instructions were sorely lacking. Ended up breaking one trying to turn the little screw thinking it was the sensitivity. Still, used it in my project very successfully.
ケンケンSOLくん
Reviewed in Japan on February 19, 2022
①プラス ②入力信号 ③マイナス ＜作成＞100均のLEDグースネックスタンドライトのグースネックを外し、根元の電池ボックス部(単3電池3本)にこのマイクの①プラス③マイナスを接続。 ②入力信号にΦ3.5小型入力4ピンジャックのマイク端子線を接続。 ③マイク端子マイナスとマイク4Pプラグマイナスを接続 ④4Pジャックをパソコンのマイクヘッドフォン4端子入力に差し込み、電池ボックスのスイッチをon。 ⑤パソコンデバイス設定でこのマイクを選択。出力はパソコンのスピーカーで対応。 ⑥マイク入力が正常にきれいに入り、TEAMS会議先の相手にもきれいに聞こえる。 ゲインボリュウムは真ん中ぐらい。⑦音質は少し輪郭がボヤっとするが、周囲60㎝通話で複数人の音がひらえる。
カスタマー
Reviewed in Japan on January 4, 2022
少し前に入居した上階の住人があまりにも大きな音をたてるので、足音に同期してブザーを鳴らす装置を、本品＋圧電式ブザー＋arduinoで作製(arduino初挑戦)。部屋のちょっとした音には反応せず、足音だけに反応させるのは、直繋ぎ・フィルタやアンプ無しでは難しいかと思いきや、±3digitくらいに閾値をおくことで結構いい感じに仕上がる。装置の効果があったのか、最近は夜中に足音で目覚めることがなくなりました。
JGH
Reviewed in the United States on February 24, 2021
I see there are a lot of great reviews but these microphones need to be very close to whatever you want them to pickup. I tried to make a music reactive display using them. Unless the speakers playing music were a couple inches away it wouldn't pick up anything. The little trim pot on the back of the mic doesn't seem to adjust sensitivity.
Christopher Bowman
Reviewed in the United States on August 7, 2020
I tried to use them for a project without the arduino board. It should work on paper, but it didn't. I can't fault them for it though because it is not designed for my use
I'm a real customer
Reviewed in the United States on March 4, 2020
These are super cool and accurate. My arduino is giving me a nice fat range of values to utilize.There are other microphone sensors WITHOUT the amplifier and let me say they are NOT worth the time because they will return noisey and inaccurate values.Try these out - I'm using them for robot eyes that wake up when you talk, open widely when you shout, and fall asleep if quiet.
Sailin' Gypsy
Reviewed in the United States on February 8, 2020
Not only can they be used as sound level meter sensors used in many projects, they are actual microphones that can be hooked directly to a pre-amp, mixer, or an analog to digital converter. If you use 5 volt power, output levels, even from background noise, will be almost 5 volts, and any intended input will clip. Using 3.3 volts on Arduino or Pi will give you about a 2 volt floor that will eliminate most clipping. There is some slight noise in the output, so I am going to try 2.5 volt vcc. Great find.
ebastro
Reviewed in the United States on July 11, 2019
This is a nice microphone for DIY projects. It has only three connections, power, gnd, and signal. It is amplified, but I found it works better when the sound is close by. I plan on using it to detect sound by a small robot.
marcia krause
Reviewed in the United States on May 29, 2019
It works very well and seems to match the stated specifications. I used it to play around with beat detection and FFT stuff, and it seems to do exactly what I expected
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