A sensor converting an acoustic signal into an electric one.

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1
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2answers
51 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) ...
0
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1answer
35 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 ...
1
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2answers
79 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: ...
0
votes
1answer
38 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 ...
0
votes
1answer
42 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 ...
2
votes
0answers
23 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 ...
0
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0answers
47 views

Connect CB Microphone to Smartphone

I'm planning to use an Android smartphone as a realtime voice effects processor with my CB radio. I did a little internet research about the way Android devices detect a connected headset and found ...
1
vote
1answer
45 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 ...
0
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0answers
24 views

Microphone specification calculation

Given a microphone specification: Nominal acoustic input level: 75 to 90 dB SPL S/N: >60 dB at 85 dB SPL Frequency response: 340 Hz to 14 kHz (-3dB) Does that mean: 1) the microphone has ...
0
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3answers
153 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 ...
7
votes
2answers
687 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 ...
0
votes
1answer
67 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 ...
1
vote
1answer
149 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 ...
0
votes
1answer
78 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 ...
0
votes
0answers
40 views

Amplify an electret microphone and feed the amplified signal through a piezoelectric disc?

I’m a student and Im trying to use an electret microphone to pick up an audio signal which is then reproduced by a piezoelectric disc as a part of an experiment with sound perception in spaces and ...
0
votes
1answer
52 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 ...
-1
votes
1answer
67 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 ...
1
vote
1answer
61 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 ...
2
votes
2answers
148 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 ...
0
votes
1answer
82 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 ...
0
votes
2answers
73 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 ...
13
votes
2answers
462 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 ...
0
votes
1answer
64 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 ...
0
votes
1answer
179 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 ...
1
vote
0answers
120 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 ...
0
votes
1answer
75 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 ...
0
votes
0answers
39 views

Mic design: Sound sensing

I will be designing a mic circuit first time. This circuit will feed an ADC and I will do signal processing on the signal. This is not for human consumption so things usually bother our ears probably ...
1
vote
3answers
261 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 ...
2
votes
5answers
181 views

Speakers as microphone

I've seen this following post regarding using the speakers as a microphone: http://skeptics.stackexchange.com/questions/5664/can-a-computer-be-hacked-to-use-a-connected-speaker-as-a-microphone There ...
-4
votes
1answer
112 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 ...
0
votes
2answers
95 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?
1
vote
1answer
136 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 ...
1
vote
1answer
189 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?
0
votes
0answers
626 views

dB Meter with Arduino and AD8307

I am attempting to construct a decibel meter using an electret mic breakout board (shown below) and an AD8307. If necessary I can use just an electret mic, and not the breakout board. I was ...
2
votes
3answers
636 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 ...
1
vote
2answers
121 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 ...
0
votes
1answer
178 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 ...
0
votes
2answers
199 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 ...
2
votes
4answers
301 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 ...
0
votes
0answers
86 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 ...
0
votes
1answer
120 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 ...
1
vote
2answers
209 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
votes
0answers
103 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 ...
2
votes
1answer
743 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 ...
0
votes
1answer
259 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 ...
1
vote
0answers
145 views

Connect electret mics to computer [closed]

I'm trying to do cross correlation on the signals arriving at a microphone pair. I do not want to record anything. Before doing this on a development board (like the beaglebone/board), I decided to ...
0
votes
0answers
43 views

Problems sending mic input to IC preamp

I am using the following product: http://datasheets.maximintegrated.com/en/ds/MAX98089EVKIT_TQFN.pdf It is an audio codec eval board with RCA input jacks. They provide software for setting all ...
2
votes
4answers
889 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 ...
3
votes
0answers
119 views

Modifying headset's microphone to hear from it? [closed]

Problem? I have a headset with a microphone, like this: Good for you. What do you want? I want to use my headset's microphone as a real microphone. It's already a real microphone, you noob. ...
1
vote
1answer
182 views

Reading analog sensor as a microphone signal (via sound card)

I was thinking and studying on how an analog-digital-converter works and just realised that the sound card of every computer-devices is exactly that one. My question is: how can I read an analog ...