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Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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2
votes
1answer
280 views

Electret Condense Microphone, the function purpose of parallel capacitor

I got a schematic diagram of Electret Condense Microphone(ECM), shown as in the below. I would like to know the function purpose of C1 and C2. Each of value is 33PF and 10PF. Thanks.
0
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2answers
150 views

Limiting/Amplifying Microphone Output?

I have a microphone whose output needs to be limited to 0V-5V. The microphone itself should be picking up audio from its environment (such as a living room). Later, specific signals will be identified ...
1
vote
1answer
484 views

Filter circuit in Microphone [closed]

I am using VS1053 audio recording IC with a microphone.There, I found some filter circuit.How do they help the IC? https://www.sparkfun.com/datasheets/Components/SMD/vs1053.pdf
2
votes
1answer
244 views

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 ...
3
votes
3answers
290 views

How to drive a speaker/microphone from a digital circuit?

I’m having a hard time understanding how to use speakers or microphones. My end game here is a sequencer I’m going to lay out what I think so that you guys can correct me and help me understand why ...
-1
votes
1answer
847 views

Digital Microphone : I2S data output

I have been playing around with some digital microphones, which have an I2S interface. I managed to get it working (Arduino board with small I2S mems board). At least, I think I did. When reading the ...
0
votes
1answer
67 views

Possible to read voltages with a DMM that's coming from an unpowered microphone?

I have an Aneng 8008 auto-ranging "true RMS" DMM with an AC mode that can measure mV. I have an unpowered lavalier microphone but when I put the probes on the ground and right or left contacts of the ...
0
votes
1answer
55 views

How to safely determine which pins output a microphone signal?

I've got a Bluetooth device that has a ten-pin mini-USB output port (a Sena GP10 GoPro bluetooth audio receiver). Two of those pins output a mic-level microphone signal, but I don't know which ones. I ...
6
votes
2answers
1k views

Will providing line-level signals into a mic input damage the recording device?

I've got a cell phone, gopro, and DSLR that I want to record audio into. I don't want to record audio into a separate device. The problem with analog mic-level (millivolt) signals is that they ...
-1
votes
1answer
95 views

Wireless Mic signal cuts out [closed]

My church uses 2 wireless microphone systems. One is an Audio-Technica lavalier the other is a 4-channel system (sorry, I don't remember the brand) About 6 months ago (after several years of flawless ...
1
vote
0answers
126 views

Is it possible to build an in-line stereo amplifier for piezo contact mics (stereo pair) with 2.5v plug-in power?

From one idea to the next, here's the back story: I'm currently taking an interest in sound design, and read an article about making sound effects from recording via contact microphones. I already ...
1
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0answers
123 views

Is it safe to plug a computer into itself? [closed]

I have a USB dongle (with microphone and headphone 3.5mm jacks). Is it safe to plug the headphone out into my motherboard microphone/line in? Would there be any grounding, feedback, impedance ...
0
votes
2answers
455 views

Part Identification: Electret Mic

I'm currently trying to reverse engineer a remote in my headphones (one of these three button things). The remote seems to work fine, but the mic is intermittent - at times it will work perfectly, at ...
0
votes
2answers
455 views

Microphone PCB Questions [closed]

I've been working on a project to build a microphone in DIY after finishing my audio engineering internship, but it seems like my knowledge in electronic isn't good enough to fully understand what i'm ...
0
votes
1answer
105 views

mic left and mic right to single TRRS mic

how to connect mic left and mic right to single TRRS mic connection. The first figure shows mic left and mic right connected to microphone output jack. I want to replace this output jack with the TRRS ...
2
votes
0answers
210 views

Dual antiphase electret mic preamp topology

I am currently trying to make a preamp for an electret mic pair, which are placed physically in antiphase. The main idea is to subtract one mic's signal from another and therefore boost the signal ...
1
vote
4answers
4k views

Possible cons of excessively long microphone cable (XLR)

I'm very new to this page and anything electrical in general. I considered putting this on the music SE page but I thought this site may prove more helpful. I have a small personal "studio" (put ...
3
votes
1answer
1k views

Can I connect multiple electret microphones for better gain?

Is it possible to connect multiple electret microphones in order to increase sensitivity (gain) of the microphone(s)? If yes, how do I connect them? Update: Obviously one solution is to increase the ...
3
votes
1answer
3k views

What is the best preamplifier circuit for electret condenser microphone?

I have one old German directional dynamic microphone "SEL BST 205-1" and I remove everything inside it and pack 2 condenser microphones from mobile phones "Nokia 5130". Like preamp I use this ...
2
votes
1answer
459 views

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 ...
3
votes
1answer
165 views

Determining speed of turbocharger via sound?

There are inductive sensors which can be retrofitted to turbochargers to measure their speed, like this: Examples can be seen here. Installation requires some careful and precise drilling and ...
0
votes
3answers
4k views

How to get audio from a sensor for an Arduino [closed]

I am working on an Arduino project that requires recording sound that is playing and flashing LED strips to go with whatever is playing in the air. Currently I am using a sensor called the KY-038 but ...
-2
votes
1answer
1k views

Iphone 7 plus mic frequency range [closed]

I recorded a video from some birds around my car while the car was off and its alarm system was on. After watching the video I noticed that there is an oscillating noise recorded by the phone near ...
2
votes
2answers
382 views

How to make mix mono into stereo audio

I am trying to mix a mono microphone into both channels of stereo audio. The output of the microphone amp is yellow. The stereo in is red. I am using 2 schottky diodes in order to mix. Is this an ...
0
votes
1answer
461 views

Auto Audio Gain Control IC for normalized audio from line level input

The problem I am having is like this: I am using an aux cord line level output from a smartphone to a MSGEQ7 chip which samples the frequencies and splits it into 7 channels which can be seen as an ...
3
votes
1answer
361 views

How to connect a diy audio signal to my “expensive” audio interface

I'm a hobbyist and after some experimentation (around 4 years) I want to connect my signals I create on the breadboard to my expensive audio interface. Until now I was using the "mic" input on my ...
1
vote
2answers
268 views

Arduino uno, control two lights with microphone

I am new to arduino and other electronic things, I want to try to control two lights on my room using it, I made this a sketch oh how I think the circuit would go, can someone with more experience ...
-1
votes
1answer
653 views

Electret microphone - How to Reduce sensitivity

I am doing a classic LED - sound reactive project. The only thing that is bothering me is that my electret microphone (MAX4466 from adafruit) is clipping, and it is because the maximum gain of this ...
0
votes
1answer
137 views

Rating loudness level with electret microphone

I would like to build a loudness sensor with an analogue output. It should provide an relatively stable DC voltage which draw conclusions about the loudness level. Therefor I use an electret ...
0
votes
0answers
179 views

Mini jack microphone only works in headset

This is so weird. I have never seen anything like this before. I have a Kingston HyperX headset. The microphone is detachable and looks like this. When I plug this directly into my PC or USB adapter (...
1
vote
1answer
127 views

HPF cut-off in microphone pre-amplifier

In the below circuit, do Rbias and R2 both affect the cut-off frequency? Or is it simply 1/2*pi*R2*C2
1
vote
1answer
607 views

Confusion about TRRS jack and mic input

Above is a mic jack going into a pre-amp. As you see the tip of the jack and the ring of the jack are both connected to the plus side of the electret microphone. And when plugged in, it seems like ...
7
votes
5answers
6k views

Why does my electret microphone amplifying and filtering circuit output so much noise?

Background information I'm currently designing a input conditioning circuit that amplifies and filters a electret microphone signal in preparation for the signal to be processed by an ADC (analogue ...
1
vote
2answers
142 views

Giant Resistor vs Current divider

1 GigaOhm resistors are so damn expensive. (Don't ask, I'm trying to build a large diaphragm condenser microphone from scratch) As an microphone pre-amplifier I am trying to bias a transistor and ...
0
votes
1answer
78 views

Mic Not Muting when switch is pressed

I mocked up the circuit that eliminates the popping sound heard when the mic button is pressed on a mic cable. However, the signal that the capacitor is attached to, the other terminal to R || Switch ...
0
votes
0answers
559 views

Increase electret microphone bias voltage

I've got a Zalman zm-mic1 microphone, that was working just fine on my laptop. I bought a new rig a couple of months ago and the microphone is really quiet, digital amplification introduces an ...
0
votes
1answer
43 views

Is it worth modding an external audio jack to a camcorder? [closed]

I have a good HD camcorder that records low fidelity audio. Instead of buying a new camcorder, I am tempted to try some external microphones on it, because the electret microphone wires are only 2 ...
1
vote
3answers
810 views

Microphone sensor for picking up voice from across the room

I'd like to create kind of a DIY Google Home using a Raspberry Pi and voice recognition software. I'm looking for a microphone sensor that will pick up my voice from across the room, but nearly all ...
-1
votes
2answers
143 views

How to convert sound energy to dc voltage? [closed]

I am ee student at METU and i have a project that is about vehicle moving depending to notes of flute. In first step,i need to convert notes of flute to dc voltage. I guess i need a basic microphone ...
0
votes
2answers
715 views

Electret microphone amplifier for computer using transistor

I'm trying to make a electret microphone amplifier using transistor to connect on my computer using a P2 connector, the problem is that using the amplifier the sound actually is lower than connecting ...
0
votes
2answers
136 views

Multi-channel Wireless Microphone vs Home Wireless Telephone System

I'm curious why a wireless microphone system for school plays requires a multi-channel receiver while a home telephone system allows as many conversation participants as there are handsets with only ...
0
votes
3answers
488 views

Microphone saturation avoiding desired signal from being detected

I'm trying to detect a known signal under heavy interference. I'm working with 2 smartphones and an interfering speaker. I'm sending a signal from one smartphone speaker to the other smartphone ...
0
votes
1answer
46 views

Replacement for the INMP401 Microphone [closed]

Sparkfun sell a module with the INMP401 module on (Datasheet), it has a small amplifier circuit and I have been using it in a project. I am creating my own PCB for this and I've just noticed that the ...
0
votes
2answers
328 views

Building an electret microphone amplification circuit, it's not working

Here's the schematics: The circuit is powered by a 9V battery. There is a voltage divider that gives 4.5V between R4 and R5, this voltage is applied to the negative pole of the electret microphone (...
1
vote
0answers
76 views

earphone microphone out put voltage range

I want to send a signal through the 3.5mm jack(microphone port) to an android mobile and process the signal using android mobile application I created. But I don't know the voltage range the ...
-1
votes
1answer
158 views

Interfacing PIC32MZ Microcontroller with Microphones

Microcontroller: PIC32MZ2048EFH144 (10 Bit ADC) Software this runs on: MPLABX Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/60001191G.pdf This Microphone has a built in USB port. My ...
3
votes
1answer
391 views

Piezo transducer preamp and AGC/compressor

I've been suggested this circuit as a good low-noise high gain piezoelectric transducer preamp (used to pick up really faint sounds in water). It is nice because it includes a high pass filter (yet ...
0
votes
1answer
94 views

Sound localizing robot

currently working on a Hobbyist Electronic Project. I have just bought the Rover V2 robot. I have attached 3 microphones to the robot- Front, Left and Right Facing. I have written some basic code to ...
0
votes
3answers
506 views

Using Microphone preamplifier IC Max4468

I am designing microphone preamplifier using MAX4468 (datasheet), but the reference diagram shows output from microphone (microphone input) going to both inverting and non-inverting terminals of the ...
0
votes
1answer
483 views

multiple microphones to audio jack [closed]

Would it be possible to have two microphones (which simply output a varying voltage between two terminals) connected to an audio jack (i.e. the standard laptop 3.5mm mic jack) and reproduce the sound ...