Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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1answer
33 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 ...
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1answer
74 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 ...
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1answer
50 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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2answers
55 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 ...
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0answers
45 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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0answers
28 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 +ΔV = 220mV, the other sensor ...
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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. ...
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0answers
49 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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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 ...
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0answers
25 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-, ...
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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 ...
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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 ...
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1answer
42 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 ...
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1answer
47 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. ...
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2answers
46 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 ...
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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 ...
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2answers
43 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 ...
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2answers
84 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 ...
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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 ...
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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 ...
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1answer
78 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 ...
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0answers
43 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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1answer
166 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 ...
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1answer
82 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/...
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0answers
57 views

Can any microphone approach the sensitivity of the Human ear in the same mass/volume?

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 ...
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3answers
75 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 ...
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1answer
138 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 ...
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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, ...
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1answer
116 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 ...
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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 ...
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1answer
83 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 ...
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1answer
62 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 ...
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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 ...
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0answers
31 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 ...
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0answers
21 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
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0answers
59 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 - ...
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1answer
57 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 ...
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0answers
166 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 ...
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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 ...
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1answer
389 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 ...
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2answers
110 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 ...
0
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1answer
49 views

Microphone Pre Amp Book? [closed]

I'm wondering if there's a book that discusses resistors, capacitors, inductors, transistors, transformers, impedance, op amps, power supplies, and the general circuitry of a microphone pre amp. Thank ...
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1answer
38 views

polarised condensor microphone

Sir/Madam, Kindly explain how is the following equation derived for the polarised condenser microphone? The output voltage V0 fed from the microphone to the preamplifier will be how is it derived? ...
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2answers
137 views

Why electret microphone with Op Amp circuit cause signal negative half wave to distort

This circuit works quite well with low signal levels, but when the RMS ac signal is appr. 0.8 to 1.0 V (measured on pin #1 of the opamp), the negative half wave of sinusoidal signal is distorted so ...
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2answers
516 views

Adapting two-way radio tactical throat mic (laryngophone) to cell phone or laptop

I've ordered one of these: https://www.amazon.com/gp/product/B074Z1LDY2/, a tactical throat mic (and earpiece speaker) which is intended to be used with Kenwood two-way radios (and other compatible ...
1
vote
1answer
140 views

ADC distortion when writing to microSD

I am doing my own project making a basic audio recording device using microcontroller's ADC to get the audio signal from electret microphone and saving data to microSD card. I'm using STM32L476RG ...
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1answer
41 views

Can i bypass the builtin rectifier and directly supply dc to my microphone preamp and reverb board

I currently have this mic preamp and reverb board that accepts 12-0-12 ac: original I have a 24v 10a switching supply and i found a way to create a 12-0-12 dc using this tutorial on youtube Would ...
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2answers
183 views

Electric current in mic

For a typical mic a singer uses in a concert, how much current is generated when the singer sings? The current transmitted from the diaphragm into the wire. What does the following specification tell ...
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0answers
139 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 ...
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0answers
78 views

extracting DC from audio signal for biasing

I've been wondering if there is a simple means of extracting a DC signal from an AC+DC signal for the purpose of providing a small DC supply to a CMOS device. Essentially the signal I'm considering ...

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