Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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4 votes
0 answers
148 views

imx6q sabre board microphone

I have been trying to record audio using the circuit below. It is different from the normal microphone circuit in that the MIC_IN and MICBIAS are separate paths. I tried to connect an electret ...
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3 votes
1 answer
235 views

Need help identifying the 4 microphone wires in my laptop webcam

I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
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3 votes
0 answers
798 views

Convert 3V unbalanced microphone to 48V phantom balanced

I have the following circuit in an existing product, which has a microphone, power switch, LED indicator, and is powered by 2 AA batteries: simulate this circuit – Schematic created using ...
2 votes
0 answers
2k views

How to represent a microphone using a voltage dependent current source in LTspice?

I am using the following schematic and I'm trying to simulate it in LTspice but I am not sure how to represent the microphone. My instructor said I should use a voltage dependent current source but I ...
2 votes
0 answers
314 views

Poor man's oscilloscope - more simple

In our lab we have NI cards and work with -10 to 10V. Oscilloscopes are rare and some mobile and quick-and-dirty solution would be fine for debugging. Therefore the 'poor man's oscilloscopes' that ...
2 votes
0 answers
1k views

How to connect Electret Microphone module and OPAMP?

I am trying to build a circuit that gets electret microphone input and maps into 0-1V for utilizing in ADC. The microphone module suggests using such circuitry When I tried that circuit and talked ...
2 votes
0 answers
187 views

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 ...
2 votes
0 answers
457 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 ...
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2 votes
1 answer
351 views

How do I wire a Shure WL 185 to to iPhone or iPad?

I have this old but very nice mic. Old days I recorded audio to the camera or recorder. Nowadays I record to iPhone so I do not have extra recording device and cameras are action cameras usually ...
2 votes
0 answers
88 views

Audio: Camera activated external microphone

I want to build a relay circuit that turns on an external microphone (powered by an internal 9V battery) when a connected camera is turned on (a camera offering only 1V plugin power through a 3.5 mm ...
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2 votes
0 answers
2k views

Noise-cancelling headphone concept

Inexpensive noise-cancelling headphones use a single microphone located in a little lump between the plug and the earphones. They seem to work fairly well for ambient noises, but not for handling ...
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1 vote
0 answers
60 views

Push to talk mic over music

I have an amplified mic and I want to mix it with an mp3 player output. I tried something like this without a relay (just a button with 2 pairs of contacts), but I hear a pop when I press the button (...
1 vote
0 answers
81 views

Amplifying electret microphones with wrong bias power

I have an issue. I'm making a device that can switch between two microphones for a two way radio. The microphone that comes with the radio is an electret microphone that gets its plugin/bias power ...
1 vote
0 answers
108 views

Designing of a ribbon microphone (sort of) output transformer

I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in ...
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1 vote
1 answer
59 views

Frequency decoder circuit microphone not working?

Thank you Vladimir - I have I believe corrected the microphone element of the circuit but it is still not working. I've attached a fresh circuit diagram. I've added an LED to detect when the circuit ...
1 vote
0 answers
104 views

I2S slave communication without an MCU - how to generate the clocks?

I am designing an audio amplifier circuit which uses an I2S digital MEMS mic (INMP441) for picking up voice signals and an I2S class-D amplifier (MAX98357A) for amplification. I have attached the ...
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1 vote
1 answer
99 views

Repair wiring of ATR6550 Condensor Microphone with 3.5mm Jack

I own a ATR6550 Condensor Shotgun Microphone in which at some point before going to my university i forgot a battery at it leaked causing corrosion on connections in battery Section and some broke out....
1 vote
0 answers
57 views

CTIA TRRS to 2 x TRS (for laptops): is the mic plug TR shorted together for bias power?

When you connect a (CTIA) mobile headset TRRS plug to a PC with separate green/pink jacks you can find Y-splitters TRRS(F) to 2 x TRS(M). My question: since the PC mic-in(pink jack) expects 3 ...
1 vote
2 answers
473 views

How to supply a microphone with plug-in-power via TRS or TRRS plug?

I would like to use a Rode VideoMicro microphone requiring low-voltage phantom power, or plug-in power, on a device which does not supply plug-in-power. There seem to be commercial options, though I ...
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1 vote
0 answers
57 views

Electret microphone amplifier to control an LED strip

First sorry about my English. So my problem is so simple but I can't figure it out. I have a frequency to voltage circuit which is working perfectly but I want to control it by the voice. https://...
1 vote
0 answers
50 views

Building a “if” statement circuit where i can control different light diodes

I want to design a circuit to react in different ways depending if a microphone picks up one frequency and in different way if it picks up the some other frequency. I want different lights to shine ...
1 vote
1 answer
580 views

How does a channel know to drive in I2S TDM mode?

I'm learning I2S right now and I am curious about working in an environment where 8 or so audio devices could be in the setup. I understand TDM mode would allow the Controller (Master in legacy terms) ...
1 vote
1 answer
105 views

dB SPL Calculation is not making sense- values are seemingly too high

I am using an electret with a sensitivity of -38.44 dBV to make sound measurements at a distance of 1m. I decided to add an amplification circuit with a gain of 125. So in the end to convert to SPL, I ...
1 vote
1 answer
202 views

How to connect microphone mono to stereo power amp

I try to connect mono microphone to stereo power amp like this image. I connect line of microphone to left and right of power amp input and ground of microphone to ground of power amp but it have no ...
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1 vote
1 answer
130 views

Troubles with mic preamp for headphones with integrated microphone

I am designing a preamp intended to interface with a microphone in common headphones (e.g. apple earpods, or sony headphones with a microphone) which will then connect to my ADC's inputs. I've ...
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1 vote
0 answers
544 views

SIM800L microphone problem

I want to feed SIM800L a microphone signal. I found this page in the datasheet and it worked but I need more a sensitive microphone. I want to hear voices in room as much as possible, like a spy bug. ...
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1 vote
0 answers
59 views

NPN condensor mic pre-amp really noisy

I have designed a pre-amp and I am having a lot of noise when silent. It seems to be around 70 Hz on my scope, but jumps around. I've tried adding bypass filters on the NPN emitter legs, as well as ...
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1 vote
0 answers
154 views

Audio Loopback Dongle Sanity Check

The same circuit as in Explain “Audio Loopback Dongle"; I wanted to know how it worked. Anything I couldn't figure out I found out via CircuitLab's time analysis: simulate this circuit – ...
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1 vote
2 answers
243 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
1 vote
0 answers
127 views

MEMS Microphone noise floor power level & audio noise spikes measurement

I have a circuit with a MEMS microphone and would like to be able to measure the audio noise spike contents and check the noise floor power level in the audio circuit. My intention is to connect the ...
1 vote
0 answers
450 views

Can I replace electret microphone with audio connector and expect similar results (sound levels)?

Last night I built a circuit that allows me to obtain sound via a SEED Grove Sound Sensor and input it into my MKR Zero for frequency analysis. It's as simple as this: simulate this circuit – ...
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1 vote
0 answers
303 views

Using an active bandpass on a very small signal

I am trying to design a active bandpass filter for an electret microphone (the output will then be read through a microcontroller to control some LEDs) (Image source - Electronics Tutorials) I want ...
1 vote
0 answers
200 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 ...
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1 vote
0 answers
88 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 vote
0 answers
782 views

Switch CB Radio mic with SPST button

I'm a beginner with this type of electronics, but want to try this. I have a CB radio with a 6-pin mic/controller. The pinout looks like this: There is a DPDT switch in the mic that switches ...
1 vote
0 answers
683 views

Choosing resistor/capacitor for wiring microphones

I've been researching how to wire up a electret mic and found this to be very common. I can't seem to find any info on what values should be used. Most people use 1k or 2.2k resistors and 4.7uF caps. ...
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1 vote
0 answers
177 views

Best possible specs for a MEMS mic in 2014?

I want to use the best MEMS mic that's on the market today (June 2014) in terms of audio quality. Since I know that "shopping" questions are forbidden, I'll phrase it like this: What are considered ...
1 vote
0 answers
1k views

Connecting a geophone to Arduino

Simple question: I want to connect my geophone to an Arduino input. The geophone I have is actually output to a microphone jack and I can plug it directly into my computer. I'm pretty sure I can treat ...
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1 vote
0 answers
2k views

Electret condenser microphone, LM386 amplification... does size matter?

I've built a motorcycle intercom, of which comprises of two amp units, one for the rider, one for the pillion. Both are powered by a 9v battery each, and the option (using a jumper) to enable boost. ...
0 votes
0 answers
54 views

DAQ sound acquisition

I have a simple USB DAQ device (datasheet). I was hoping that with differential voltage I would be able to measure simple sounds and convert/store them as a simple audio file (e.g. WAV, MP3). I see ...
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0 votes
0 answers
37 views

Why does some electrets buzz and others have fantastic SNR on the same pre-amp?

I have a tiny wireless mic preamp which sounds muffled. I swapped it for high quality capsules, they produce crazy amounts of buzzing. I am using short wires and complete foil shielding. The tiny low ...
0 votes
1 answer
63 views

Connecting/wiring MEMS mic breakout to 3.5mm audio jack and reading from it?

I've been trying to develop a model for estimating the flowrate of urine based on audio (inspired by studies such as this one) and want to use it to make a device that could be used from home that ...
0 votes
0 answers
76 views

How to electronically sample speaker output

I have a device which, under normal conditions, is connected to a 16 Ohm 0.25W speaker via two terminal blocks. When the speaker is connected it enables the device to play a song or other tone when ...
0 votes
0 answers
148 views

Calculating SPL in octaves from .wav file recorded with microphone in Python

I made a recording of my environment with a microphone with the following specs: The recording has a sample rate of 44.1 kHz and a bit depth of 16. I use: y, sr = librosa.load(latest_file, sr = 44100)...
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0 votes
0 answers
108 views

How to wire a dynamic mono microphone with PAM8610 stereo audio amplifier

I am trying to make a audio amplifier with PAM8610. I have a dynamic mono microphone. In the PAM8610 official file they say that "To use the PAM8610 with a single-ended source, acground the INP ...
0 votes
0 answers
50 views

voltage amplifier design feed by current source

I want to connect electret microphone with long wire to receiver. Usual way is to use balance line technology, but it can be expensive, then I've opted to use CCLD Constant Current Line Drive ...
0 votes
0 answers
128 views

Microphone active low pass filter doesn't work

I am trying to make an active low pass filter for my school project. I need to design a filter with 2000 Hz cut off freq and 20-25 gain. I tried to use TI filter design tool and analog devices filter ...
0 votes
2 answers
151 views

Monitor microphone signal on a USB oscilloscope

I would like to monitor a microphone signal on my cheap USB oscilloscope (LKHT00SU1.) I have tested it with a square signal generated from an Arduino. The microphone is a small one with a 3.5mm jack (...
0 votes
0 answers
190 views

Help understanding Phantom Power

I understand that 48 V is applied to both sides of the microphone signal with a 6.8k resistor (typically) as shown in this image: I'm looking to add a device INLINE with a microphone that I want to ...
0 votes
0 answers
64 views

Telephone headset adaptor weak microphone and speaker sound

I have made a simple adaptor for a telephone P4C4 -- RJ9 -- separate headset output (The wiring diagram of a telephone handset can be viewed in this wikipedia article) to two TRS jack for an ordinary ...