Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [mems-microphone]

36 questions
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How do I minimize oscillation in this 2-wire electret MEMS microphone interface?

Circuit is as follows: Ignoring the ground/shield separation at the audio jack, you get a two-wire interface at the plug. The FET does double duty as a minimum drop source follower power supply (DC) and mixer output (AC input via C2 after adding…
user107063
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Help with finding the type of output for a mems mircophone

I am using this MEMS microphone for a stethoscope project. The data sheet recommends the following interface circuit. I can't seem to find where it states specifically that it is a differential output instead of a single-ended one. Am I right in…
EcksDeECksdeee
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MEMS microphone gain calculation for MCU ADC

I've got a Knowles SPH1642HT5H-1 (pdf link) analog MEMS microphone that I'm planning to connect to one of the ADC inputs on an STM32. I've done what I think are the correct calculations to determine the gain and offset that I will require but would…
Andy Brown
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Can I connect a MEMS mic directly to this spectrum analyzer chip?

I have a ICS-40181 MEMS mic and want to do basic spectral analysis using the popular MSGEQ7 chip for the purpose of a sound reactive project. Can I simply connect one into the other (with cap/res as directed) or do I need an amp between them?…
Glebbb
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How to check if MEMS microphone is working?

I am using a MEMS microphone that I got from Digi Key ( Part Number: 1428-1021-1-ND). I soldered the mic on a PCB board using hot-air and then add an amplifier to increase the gain (Operational Amplifier Mouser Electronics 595-LPV802DGKR). I made…
Tesla001
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Microphone connection diagram

I am trying to replicate project Jasper of raspberry pi. Currently I am using a USB to audio converter (shown in image below) and a regular PC mic. However the audio reception range is very small. So, I am planning to make my custom mic with opamp…
Whiskeyjack
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How to remove INMP441 MEMS microphone low-frequency noise

I have code that allows me to record I2S audio from the INMP441 MEMS microphone module using an ESP32. The data is read from the data out pin of the device. When I take the Fourier transform of this signal while recording a 2 kHz tone, I get a large…
Grabt234
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How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs single channel audio peak to peak at approximately…
AV_Sig2k19
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Polar pattern of typical speakers and microphones found in smartphones

I'm interested in knowing how is the directivity of the typical microphones and loudspeakers found in smartphones and tablets affected as they operate in the near ultrasound region (18-21 kHz). Near ultrasound region smartphone's transducers…
VMMF
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Can I connect my ADMP401 straight to my computer's microphone jack?

So I'm looking to get a bit more value out of this little 'ol microphone I have. It has a Vcc, GND, and an analog data port on the breakout board. Could I splice a 3.5 mm jack wire and connect the microphone to my computer's microphone port to…
shortstheory
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Testing an I2S slave device

i have a MEMS mic with digital I2S output. What is the easiest way to test that my microphone communicates right? No need to verify the sound, i just need to verify on bit level that communication occurs. For example how can i test it with an…
vasf
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Interfacing to MEMS microphone with PDM output: what is causing this DC bias?

I have a MEMS microphone (IM72D128V01, using this eval kit) with PDM output connected to a STM32U5 NUCLEO board. (Background: it's connected to the ADF/Audo Digital Filter peripheral which I have configured to provide a 5th order CIC filter with a…
davegravy
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I2S microphone data synchronization for left and right channel

I have I2S MEMS microphones (transmitters, stereo) in slave mode and a microcontroller in master mode. When the WS pin iw 0 (low) the data available on the SD pin is for the left channel (microphone 1.) When the WS pin is 1 (high) the data…
CuriousByte
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Low-pass filter on PDM data provides data that does not have a FFT

I'm trying to convert PDM data into analog form by passing the data through a low-pass filter in Matlab. My approach is fairly simple and matches the answer given in this Electrical Engineering Stack Exchnage thread: How can I convert an audio PDM…
dg1271
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Choosing an OpAmp for MEMS mic preamp stage

I am trying to create an updated version of a mems mic board, like this one from sparkfun. They use an INMP401 mems mic (which is not recommended for new designs) and an OPA344 for the preamp stage (20 years old, from the datasheet creation…
gustavovelascoh
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