Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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2answers
465 views

Microphone amp getting only 1x gain?

I'm trying to build Sparkfun's sound sensor and testing the first stage only. Here's the first stage: If I scope before C2 and at Pin 1, I get the following when I scream at it: where Ch1 is the mic ...
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4answers
469 views

JFET in place of digipot for gain control?

I'm hoping to build a sound sensor using this schematic (http://cdn.sparkfun.com/datasheets/Sensors/Sound/sound-detector.pdf) To programmatically adjust the gain, I could use a digipot. My (naive) ...
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1answer
2k views

SG electret microphone static impedance

I have an SG electret microphone (see figure below) connected to my phone, and it produces pretty bad signals (keeps mostly the low frequencies while killing the high frequencies). I suspect it is the ...
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2answers
948 views

Aux and Microphone to same input

I have a loudspeaker for my car and I've added an aux cord to the system so that I can play music over it. There is also a microphone attached to it and what I've done is add a 3 way switch between ...
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1answer
276 views

Noise spike on microphone amplification circuit

I'm trying to build an electret mic amplification circuit. I see some weird spikes by just connecting the microphone like so: ...
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3answers
1k views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
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2answers
5k views

LM324 Pre-Amp For Mic (to PC) Not Working

I don't have much experience in circuit assembling or designing but I wanted to create a pre-amp for my microphone(Philips SBC MD110 Dynamic Microphone which I directly connect to my PC) to boost the ...
5
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2answers
909 views

What is the purpose of the resistor connected across ultrasonic receiver terminals?

I have seen a few circuits where a resistor is connected across the positive and negative (grounded) terminals of an ultrasonic receiver. It seems to "stabilize" the received signal. I have attached ...
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1answer
68 views

Simulating a microphone with a microcontroller?

I'm trying to use a microcontroller to replace where a microphone would normally be connected (to a radio module) to feed a sine wave into the radio module. I can produce a sine wave (I think) but it ...
2
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2answers
973 views

Op-amp non-inverting amplifier with clamping?

I am designing a simple electret microphone amplifier for use with Arduino. My current design is shown below: I was wondering if there was a way to combine the diode clamp (D1 in the schematic) with ...
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1answer
150 views

electret microphone dynamic impedence

how much is the dynamic impedance/resistance seen from a electret microphone? I am trying to design a microphone preamp and need to know seen resistance in small signal from the signal source (...
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2answers
312 views

Microphone preamplifier doesn't give expected gain

I was designing a microphone pre-amplifier circuit for Wireless Noise Monitoring application. I used an electret microphone AOM-5244L-R-53724 (datasheet: http://www.puiaudio.com/pdf/AOM-5244L-R.pdf)...
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3answers
2k views

Series vs parallel for microphones (electric guitars)

I want to create a passive "mixer", with which I can connect two of my guitars to one amplifier, so basically one with two 6,3" input jacks and one for output. For passives without a transformer as ...
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1answer
2k views

Using an unamplified piezo in a mic-in jack

it's my first time working with piezos and I'd like to use one as an input to my iPhone via the microphone port to allow my app to detect vibrations. in order to do this, I was thinking that I'd use ...
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0answers
138 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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1answer
388 views

How to PCB layout WM7230 MEMS digital microphone?

I'm trying to figure out how I'm supposed to get traces to the four internal data pins of the Wolfson WM7230 Digital Microphone part. It's got a ground ring that is supposed to have a tight solder ...
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3answers
7k views

Frequency Detection Circuit Design

I want to create a circuit that can detect audio frequencies and flash RGB LEDs different colors depending on the detected frequency. The frequency range will be from 20 Hz to 12 kHz, after looking at ...
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2answers
3k views

Use of 100K ohm resistor along with 0.1uF capacitor?

In the circuit diagram below, why is there a 100KΩ resistor (NOT R2) connected to the capacitor? To my understanding the capacitor-resistor act as a high pass filter to block the DC offset of ...
2
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1answer
8k views

Do electret microphones have polarity?

So do electret mics have polarity? The following circuits seem to contradict each other... 1) 2) Now the problem is one image shows polarity while the other one does not!! What's the holdup here?
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2answers
1k views

Electret microphone amplifier - Terrible low frequency response

I have tried to design a amplifier for an electret condeser microphone. It is basically just a common emitter NPN amplifier. The problem is the frequency response of the real circuit. I get the ...
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2answers
2k views

5v Electret microphone to PC mute switch pop help

I've got a PC microphone that fires off a loud pop when muted. Upon taking it apart it appears that its mute circuit is really simple and therein may lie the issue. I've combed this board for fixes ...
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1answer
184 views

power a 5V source from an android headphone

I need an android headphone to turn off and on a 5V source The android heafphone supplies an AC voltage (maybe 0.6V) at a frequency of my choice. I want this to open/close the 5V supply (from another ...
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1answer
142 views

How to connect a jack lead to the input of a 741 circuit

Below is a diagram of a 741 circuit with a microphone attached, I've built the circuit and it works reasonably well. However is it possible to connect a jack lead to the circuit instead of a ...
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1answer
323 views

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 ...
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2answers
965 views

Advice to improve my microphone circuit

I'm still working on a circuit to hear my heartbeat. I've come a long way but it still doesn't sound as good as some example recordings I've heard. I was wondering if someone could spot something ...
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1answer
559 views

How does a consumer microphone achieve a sensitivity of -20 dB?

How does a consumer microphone achieve a sensitivity of -20 dB (Edutige EIM-001), when one of the best industrial electret microphones I could find (Primo EM158) has a sensitivity of only -32dB (1 kHz ...
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2answers
464 views

Microphone preamplifier

Can you explain about microphone preamplifier in the next circuit? http://circuitndiagram.blogspot.ru/2013/04/fm-transmitter.html Is this mic preamplifier of class C? If it is then how can it works? ...
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2answers
883 views

Digital data coming out of a cell phone headset mic?

I want to connect a sound board / mixing console / whatever-you-prefer-to-call-it to the headset jack of my Motorola Android phone. I know the typical TRRS pinout of Left/Right/Ground/Microphone, and ...
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1answer
79 views

Displays, camera, speakers, microphones: why after more than 50 years of development do they still need calibration? [closed]

An old question running through my mind: Displays, camera, speakers, microphones: why after more than 50 years of development do they still need calibration? Whatever cheap or high-end material I ...
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1answer
1k views

Direct interfacing of analog MEMS microphone to microcontroller ADC

I would like to sample the output of an analog MEMS microphone with an ADC embedded in a uC, sampling rate up to 1MHz. I don't care too much about signal quality (as I'm more interested in ambient ...
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0answers
1k 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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1answer
552 views

Decoupling pair of microphones using noisy power source

I currently have a high quality microphone that I am powering from a relatively noisy 8V source, like that shown below. It has a built-in amplifier, and doesn't require any amplification. It just ...
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3answers
1k views

Can I use a PC Microphone in a PIC with ADC?

I want to do an FFT on some music, I found an electret board so connect directly to the ADC port, but I was wondering if it's possible to use a normal computer microphone, anyone know a tutorial or ...
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5answers
3k views

Speakers as microphone

I've seen this following post regarding using the speakers as a microphone: https://skeptics.stackexchange.com/questions/5664/can-a-computer-be-hacked-to-use-a-connected-speaker-as-a-microphone There ...
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1answer
393 views

What does those symbols on these wires mean? (USB)

I got this cable while fixing my Microphone (Audio Technica ATR2500-USB). It came from a USB B type connector at the bottom of the mic. Does anyone know what does these symbols on the wire correspond ...
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2answers
232 views

Electret Microphone recognize music with FFT

Do you think is possible that this Electret Microphone https://www.sparkfun.com/products/9964 plus a DSPIC can recognize music frequencys with a FFT, or the electret only recognize the sound levels?
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1answer
976 views

Electret microphone filtering

I am coupling an electret microphone to the input of an audio codec which does all the amplification, so all I need is biasing and filtering. I picked up the circuit from a colleague and I'm having ...
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1answer
5k views

Do smartphones and tablets generally use dynamic or condenser electret mics?

I've heard electret microphones are usually what's in a smartphone, but I've never heard about them. Is it the most common type or is it condenser or dynamic? Or a mixture of the three?
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3answers
10k views

My simple audio amplifier circuit does not work

In previous experiments I've made circuits to transfer sound from electret microphone to a powered speaker. Now I'm doing my first experience with an Op-Amp to make the sound louder and to be able to ...
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2answers
268 views

How to play a microphone out of a speaker?

So I have a small amplifier that plugs into a 12V source and a standard 3.5mm headphone jack and plays pretty good sound to a 8ohm speaker. I am wondering if I can connect the 3.5mm headphone jack to ...
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1answer
2k views

Technical name for 3.5mm microphone input and speaker output to headphone with microphone cable? [closed]

I am trying to find a cable online that takes the front jacks on my computer case (speaker out, audio in) and merges them so I can use my headphones that have a built in microphone. What would I ...
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2answers
1k views

Advice on building a noise sensor

I'm attempting to build a noise sensor that detects loud environmental noise. The idea is that the sensor would be able to detect loud music or a loud television within 30 feet, in order to record a ...
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4answers
961 views

Beats per minute calculator

Basically I want to create a BPM calculator on an ATMega1284. So I have a mic hooked to the ADC already (with potentiometer). I can probably calculate the BPM by getting samples for a while and ...
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0answers
170 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 ...
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1answer
272 views

Understanding a circuit diagram

I am trying to use an electret mic with beaglebone. Instead of making a preamp, I am using a locally made 'audio board'. This is the instruction slip that came with it : However, I do not understand ...
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2answers
1k views

How is this preamp design?

I'm trying to design a preamp for this electret mic. I kind of pieced this schematic up from something I have found on the web. Does that look ok? I'm going to sample the output with an ADC (...
2
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1answer
330 views

Electret Mic preamp for sampling and FFT

I'm working on a project in which I want to be able to have some light effects based on the ambient music. I was thinking of sampling a mic and running an FFT, and set effects according to that. Is ...
3
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1answer
5k views

Pre-Amplifying Electret Microphone for ADC Input

I have designed a simple circuit that amplifies an electret microphone (this one: https://www.sparkfun.com/products/8635). This amplified signal must be no greater than 3.3V, so I bring down the ...
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1answer
691 views

Decode an infrared signal with an IR demodulator inside a microphone jack

I was looking at this tutorial about how to decode an infrared signal. One of the posts says For the scoped challenged (like me), a PC microphone jack works great for reverse engineering IR ...
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4answers
2k views

Calculating Wavelength of sound using an Arduino

I'm using an Arduino Uno R3. I need to measure the wavelength of sound of a particular (known) frequency. By substituting in the equation: Vsound = Frequency * Wavelength ...I wish to calculate the ...