Questions tagged [microphone]
A sensor converting an acoustic signal into an electric one.
457
questions
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2answers
82 views
Electret microphone preamp is buzzing , weird noise and cannot find a solution
I'm building an electret microphone pre-amp following this application note, the output of the preamp is connected to an LM386 and then to some headphones.
So my pre-amp circuit looks like this, where ...
1
vote
1answer
35 views
Connect multiple earphones (with microphone) to one computer
I would like to connect up to 4 pair of earbuds (the in-ear type, stereo, with a TRRS connector and a tiny condenser microphone located along the cable, think iPhone wired earbuds) to a single ...
1
vote
4answers
77 views
Equipment required to measure audio line-out voltage peak-to-peak?
I want to measure the output voltage coming from the line-out of my tape recorder such that the output is 5 to 6 volts peak-to-peak by adjusting the volume control.
I am new to electronics. Can this ...
5
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3answers
104 views
Mic amplifier noise
I build a mic amplifier for a standard hands free (Apple 4-pole jack). However, even without anything plugged into the jack there's audible noise at the output (MIC_IN in diagram). It sounds like ...
0
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2answers
61 views
Wiring for stereo mic using MAX9814
My goal is to test some algorithms for sound localization, so I connected two microphones (MAX9814 boards from adafruit) to my soundcard. In the future I want to use four channels.
I wired them like ...
1
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1answer
50 views
How to correctly calculate dBv using voltage sample points?
I'm working on a noise detection application and now I can read the Vout value of the MEMS microphone VM1010.
By searching on the Internet, I find ...
0
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1answer
51 views
What FET can I substitute for PF5102 or J305? [closed]
I want to build this microphone: https://www.instructables.com/id/Modify-a-cheap-LDC-Condenser-microphone
I am able to find all of the parts except for the FET. The schematic says to use PF5102, and ...
0
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1answer
55 views
Confused about op amps and wiring for parabolic mic
I consider myself a fairly smart guy (20+ yrs web programmer, Computer Science degree), but in the past couple years, I've started to delve in the realm of electronics design and I'm constantly ...
0
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2answers
61 views
Microphone closest to mimic human ear (not just few inches away) [closed]
I am currently doing a project that require sensitive microphone as in human ear for voice recognition - but not sure where to start.
From what i understand common microphone could only pickup sound ...
0
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1answer
59 views
Creating a custom TRRS splitter for headphones and mic; how to handle the mic's TRS jack?
I want to create a TRRS splitter / joiner that can be used to combine two 3.5mm jacks, one for headphones and one for a microphone, into a single 3.5mm TRRS male jack. It'll use the CTIA standard so ...
0
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1answer
77 views
How do I slowly short pins 2 and 3 of a phantom powered mic signal?
Shorting pins 2 and 3 of a microphone signal will mute it and is acceptable for when phantom power is present. I can do this with a regular switch, or a solid state relay. But is there a simple way to ...
0
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1answer
52 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 ...
0
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2answers
60 views
PIC MCU: Reliably Capture and Measure Drum Transients with ADC
I'm seeking advice to help my circuit/code/mcu work more reliably and accurately. What I've got right now is almost there, but I'm just missing the know-how to get me consistent readings. I've tried ...
1
vote
0answers
48 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.
...
1
vote
0answers
34 views
ADMP401 output voltage difference
Good morning. During the experiment with the sound sensor, a question arises, so I ask.
The output of the sensor itself varies from the same sound.
When one sensor is +ĪV = 220mV, the other sensor ...
0
votes
0answers
37 views
Cutting the earbuds and keep the microphone: will it work?
I have old still functioning earphones with a microphone incorporated.
I want to keep the microphone and remove the earbud so that I can then put the microphone inside a small pipe and record sounds.
...
1
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0answers
50 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 ...
5
votes
3answers
2k views
Why would this microphone only work while touching the volume control?
My son bought this USB microphone for his computer. It only works if you keep your hand on the volume knob. I assume this is a grounding problem. I took it apart. It looks like the copper wire ...
0
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0answers
30 views
How to Feed SIM800L MIC IN
I want to connect 8 Ohms/0.5W Audio output line from an ISD 1820 Voice module to SIM800L MIC IN.
I see on both SIM800L MIC IN & ISD1820 Speaker out are not common ground.They have marked SP+ SP-, ...
0
votes
1answer
67 views
MEMS microphone different output voltage at the same dB
I am trying to measure noise using the ADMP401 (MEMS) sensor.
In the dynamic sound (applause, the sound of hitting the desk, etc.,) a sensor output of + -200mV is obtained. However, for the sound of ...
0
votes
0answers
29 views
Intercom System
I am trying to make a prototype to test a circuit.
It is about am intercom circuit.
I have an intercom device with 2 wires, and it supports multiple stations and everybody can talk and hear at the ...
0
votes
1answer
43 views
Connecting a preamp to computer
I've made a single transistor preamp for an electret mic. The curcuit is like this:
simulate this circuit – Schematic created using CircuitLab
I want to use this on a computer. The mic input of ...
0
votes
1answer
48 views
Is the 3.5mm jack somehow connected to the phone's transceiver?
I could not find a clear answer to that and it's driving me nuts, because I have a microphone, which when connected to my phone via 3.5mm jack picks up a sort of buzz, as if from wireless inteference. ...
1
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2answers
47 views
Risk of long-term shorting XLR cable
I'm adding a 'mute switch' into my XLR cable.
To mute an XLR cable/Phantom powered microphone you temporarily connect pin 2 and 3 in the cable to short the connection. I have seen plenty of youtube ...
1
vote
1answer
26 views
Making a phantom powered power switch (not mute switch) with LED indicator
I want to create an XLR inline power switch (with indicator) so that I can turn my phantom powered microphone on and off as I please!
I have found a few guides online that explain how to create a ...
0
votes
2answers
47 views
When wiring an electret microphone is using the wire shielding as ground ideal?
Currently with a "single-conductor" shielded wire I have connected the (+) pole of the mic capsule to the wire, and the (-) pole to the shielding strands. I am wondering why the ground wire doesn't ...
1
vote
2answers
91 views
Headset microphone is noisy, but touching speaker wires removes the noise
I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. As I ...
0
votes
1answer
36 views
What is a digital common?
I am working with Benthowave BII-7186 Miniature Probe Hydrophone. In its datasheet I have come across the following information about wiring:
I am not sure what is Digital Common, and how different ...
1
vote
1answer
49 views
Replace microphone signal with an audio signal taken from my phone
From researching on the internet I have learned that microphones output analog voltages and with the help of amplifiers they can store that variating voltages as digital data in case you want to store ...
1
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1answer
79 views
What kind of microphone is this and how do I use/bias it?
I am designing the mic input for a ham radio chip I bought, a DRA818V.
Someone gave me an old Kenwood ham radio mic and said I can use that mic for my circuit. The mic element is shown below:
What ...
1
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0answers
50 views
Audio Loopback Dongle Sanity Check
The same circuit as in Explain āAudio 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 – ...
3
votes
1answer
193 views
Explain “Audio Loopback Dongle”
This AOSP/Develop/Audio page describes the following audio loopback dongle. Can someone explain it?
To ensure that the output signal will not overload the microphone input, we cut it down by about ...
0
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1answer
114 views
How to connect a line-out to mic on Android plug? (CTIA)
I want to connect line-out of a device to the microphone input of an Android phone, a Xiaomi Mi 4X. Then I can record and live stream from the phone.
If I simply connect line-out left/right (red/...
1
vote
0answers
79 views
Can any microphone approach the sensitivity of the Human ear in the same mass/volume? [closed]
I recently dropped a very tiny object onto the floor in a normal room (mass probably low milligrams). I heard it hit the ground. I would like to build a circuit that could "hear" such a small sound ...
0
votes
3answers
76 views
Best XLR cable and metal for home use & vocals? [closed]
I am very lost on what the recommended XLR and also the what the recommended type of metal connector is for sound quality as many say completely different things such as Silver being more conductive ...
0
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2answers
177 views
TL082 electret preamp and LM386 power amp
I have spent the last few days trying to prototype a TL082 electret mic preamp (based on this schematic). I swapped the TL071 in ...
4
votes
1answer
317 views
Acoustic localization
I apologize if this is not really an EE question, but it seemed most appropriate. I am considering the following application.
Object is 3000m far away and emits a sound of 94 dBSPL at 0.5m, I, ...
0
votes
1answer
132 views
Microphone with LM386
I am trying to build an audio amplifier circuit based on this design using an LM386 opamp. On the output side (pin5) an Arduino is connected constantly reading out the pin
...
0
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2answers
130 views
Filters generate output even if they are not connected to any signal and does respond differently to different signal sources
opAmps are fed by +/- 9V.
I have two more filters like this one, in total three filters.
If I use a signal generator as input signal and observe output via an oscilloscope; all those filters give me ...
1
vote
1answer
86 views
Is there a preferable way to amplify the signal from an electret microphone? [duplicate]
I need to amplify the microphone output to some level about 3-4 Vpp without a DC offset. The output voltage will only be sensed (it will pass through a peak detector). So I assume I don't need any ...
0
votes
1answer
66 views
Electret microphone signal amplification
What will be the output of these electret microphones? To be able to have a 3-4 Volts peak output, what should be the gain approximately?
P.S. : Unfortunately these are not products bought from a ...
0
votes
1answer
59 views
Electret microphone weird offset problem
Hi I am trying to amplify my output from electrec (analog microphone) with below design. When I used 1uF capacitor it has -300mV offset, so that I changed capacitor to lower value with trial-error ...
0
votes
0answers
33 views
Converting camcorder internal microphone to external pluggable via jack
I am trying to convert excellent microphone from sony vx1000 camcorder to external one pluggable via jack.
I removed the microphone and was able to find schematics
I tried connecting jack directly ...
0
votes
0answers
22 views
Converting camcorder internal microphone to external pluggable via jack
I am trying to convert excellent microphone from sony vx1000 camcorder to external one pluggable via jack.
I removed the microphone and was able to find schematics
I tried connecting jack directly ...
0
votes
0answers
62 views
Adding LED to anti-audio pop circuit
I have built a slight variation of this circuit listed elsewhere on this site:
5v Electret microphone to PC mute switch pop help
I'm using this to add an inline switch to my computer headset - ...
0
votes
1answer
61 views
Cannot connect microphone using audio jack
I have a microphone and a female 3.5 mm audio jack. I want to use the jack to get the signal from the microphone for a project with an arduino. To test if the microphone works or not, I'm trying to ...
2
votes
0answers
184 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 ...
0
votes
1answer
106 views
How to record a speaker?
Complete noob here. I don't need a ready to implement solution, pointers on what to read upon and ideas for even simpler projects to gain experience first are perfectly fine.
I'm trying to feed both ...
1
vote
1answer
461 views
How can I make a phantom power mic popless mute switch?
I want to make a phantom power (PP) mic mute switch with an indicator led powered by PP. I already did it based on the following circuit. It works but, with the led included in the circuit, I get a ...
0
votes
2answers
127 views
3.5mm Push to Talk Switch
I am looking to take a 3.5mm microphone line, insert a press button switch (a foot pedal in my use case) between the headset and the computer. I would like the switch to mute the mic connection when ...
