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Adafruit Electret Microphone Amplifier - MAX4466 with Adjustable Gain [ADA1063]
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- Adafruit Part Number: 1063
- Stock Type: Sensors >> Sound/Noise
- In Stock & Ready to Ship
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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). 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 our 3.7W stereo amp) if you want to connect the amp directly to speakers . If you're connecting to a microcontroller pin, you don
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This product from Adafruit comes with easy to find/use information on how to use it and implement it into an arduino project; this makes getting started with it easy. It can be used to identify amplitudes of different frequencies with an FFT library in arduino (Though the higher frequencies seem to display a lot of noise from my tests.) you can also simply use the device to record audio 'loudness' and can be used as a form of human presence sensor as people tend to make a lot of noise. In fact I purchased a second one for a project to identify human presence where I will use it along with a list of other sensors to identify if someone is in the room. Overall I am very satisfied with this product as it allows you to add the functionality of a microphone to a project without having to develop complex circuits or prepare software for it.
I bought two. One was DOA and the other had a frozen potentiometer with solder in it.
It worked at the level it was frozen at, but trying to get it unstuck damaged it and now it doesn't work either.
Would have been nice to have the pins pre-soldered but was not a big issue. A small hassle to find example code to test this out but I would recommend going to the actual Adafruit site and running their supplied code.
Yes, this microphone is not that sensitive. It is smaller than a quarter and didn't claim to be that sensitive. HOWEVER, for me at least, this is a very simple fix. For example, if you are trying to decipher something like a clap then do a little testing, and change the threshold corresponding to where you want to sense the clap from. All it takes is changing the threshold that "detects" the clap. Granted the distance from the microphone can make the clap register a very different value but that is not the microphone's fault. Use multiple at different position if you have to.
Works well and does as described. Will update if I have issues.
The only problem is that there is zero protection on the audio output line. If it comes into contact with the bias supply, the MAX4466 is gone instantly, so do not wire these to a TRS connector, you'll blow the board the first time you plug it in. They're fine with mini XLRs.
update March 2018:
Well, it was working great for a while. Then just stopped sending sound to my monitor. Gain adjustment doesn't seem to make a difference. No crash or water... just decided to stop between flights.
Turning the little trimpot fully CCW gives the most sensitivity, which seemed fine to me.