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2 pcs of MAX4466 microphone module
Description:
The MAX4466 is a micro power operational amplifier , has been optimized for use as a microphone preamplifier.
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).
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 it’s 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.
Features and benefits:
Power supply voltage: + 2.4V to + 5.5V (can be directly connected to development board)
Power supply rejection ratio: 112dB
Common mode rejection ratio: 126dB
AVOL: 125dB (RL = 100kΩ) rail-to-rail output
Static supply current: andlt;24μA
Gain bandwidth: 600kHz
Size: 20.8mm x 13.8mm x 7.5mm
Applications:
Cellular phone
Digital repeater
Headphones
Hearing aids
Microphone preamplifier
Portable computer
Speech recognition system
NigelCHP
Reviewed in the United Kingdom on August 6, 2024
Tried these connected to a ESP32 running WLED but performance was very poor. Returned and bought an IMNP441 instead, which works really well.
Brent
Reviewed in Canada on February 14, 2023
One sensor was new in the package. The other had leads soldered, then cut off. Both sensors didn't work.
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