Questions tagged [condenser-microphone]

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7 votes
2 answers
272 views

I need to generate a +200V polarization voltage (Stable, low noise, micro-amp output)

Ever play with high end condenser microphones? Like the ones used in test facilities for vehicles, and other stuff? Well I do and it's not a cheap hobby, I have taken care of all the other issues (...
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0 votes
1 answer
113 views

Function generator to microphone preamplifier the right way

I want to test a condenser microphone pre-amplifier using the signal from a function generator. Normally I would connect the condenser microphone via balanced XLR to the preamplifier. For my test ...
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1 vote
1 answer
59 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....
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4 votes
1 answer
159 views

How are the PNP transistors biased in this microphone circuit?

If I am not wrong, the biasing voltage to turn on an NPN transistor is emitter voltage + 0.7 volts. Similarly, the PNP biasing voltage is emitter voltage - 0.7 volts. Can someone explain how the two ...
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0 votes
2 answers
68 views

Why might a condenser microphone suddenly only record very close sounds?

I have a condenser microphone which is powered over USB (MPM-1000u if you care - it has a cardiod pattern). It was working fine, but recently it seemed to stop working - it didn't seem to record ...
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  • 101
1 vote
1 answer
1k views

How conductive is aluminized mylar?

So, for my own eccentric reasons, I want to build an honest-to-gosh condenser microphone like they did back in the 1930's (only not as good, I'm sure). My basic thinking is to use a sheet of aluminum ...
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  • 35.8k
0 votes
1 answer
120 views

Help with electret mic

I'm using this preamp circuit for my electret microphone and then feeding the output to A0 analog pin of an arduino uno board. For some reason my serial monitor in the arduino ide shows the output at ...
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0 votes
0 answers
198 views

High quality, low-noise, pre-amp circuit for condenser microphone (with phantom power)?

EDIT Suggestions so far, and reference to another question indicate that a discrete FET based input stage, perhaps followed by a particular low-noise IC for a second stage, might be a good approach. ...
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2 votes
1 answer
90 views

How to design pre amp for a condenser studio microphone

I've bought a condenser studio microphone that connects to my computer. It looks like this: Unluckly it's too quiet and actually can't make any recording without boosting it's sensitivity in Windows (...
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0 votes
1 answer
563 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 ...
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0 votes
1 answer
466 views

Condenser microphone + LM386 + Arduino

I found this simple circuit and I set it up with BCM-9767P, LM386N and tried to write out the values I get. The problem is that the values seem to be constant and don't change with the environment ...
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  • 1
0 votes
2 answers
65 views

Pre-amp connection problem

I am trying to complete the circuit shown above. I am having trouble as the ground connection is not clear to me. Please help me to complete that circuit. And also tell me how to connect C5 ground ...
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0 votes
0 answers
467 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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3 votes
2 answers
325 views

Random Electrical noise LM386

I tried to make a microphone (condenser microphone) amplifier that powers a 0.5W 8 ohm speaker using the LM386, however I have been having random noise issues. Whenever the power is connected, the ...
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2 votes
0 answers
814 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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0 votes
1 answer
120 views

AC-Coupling blocking negative voltage values

This question is about the amplification of an electret microphone signal In this video: https://www.youtube.com/watch?v=SToBPCajwc0&t=615s He is using an AC-Coupling capacitor to block the DC ...
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1 vote
1 answer
220 views

LM386L does not amplify the microphone signal

I've encountered a problem. I recently bought a condenser microphone and I wanted to have some fun, so that if I said something into the microphone, I'd hear myself in the small 8 Ohm 0.5W speaker. I ...
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  • 19
0 votes
1 answer
41 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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-1 votes
3 answers
197 views

Condenser and electret microphone use

Can a condenser or electret microphone be used as a speaker if all necessary related components are included in the circuit?
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0 votes
1 answer
501 views

Uni-Directional Electret Microphones and an Arduino

I am currently trying to connect an electret microphone to an Arduino. I have found many circuits to do this but some don't work. I have tried one such circuit with a LM386 with no success. ...
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0 votes
4 answers
1k views

How to remove noise from microphone input?

The Issue I've made a project centred around the XS3868 module which is based on OVC3860. The circuit works fine and I was able to get the microphone to work except for just one thing, the mic input ...
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0 votes
1 answer
529 views

How to find these resistance values in microphone phantom power power supply?

In most phantom power supply schematics or documentation (see for example https://en.wikipedia.org/wiki/Phantom_power#Technical_information), I see: 6.81 kΩ when powered by 48V 1.2 kΩ when powered by ...
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  • 1,688
5 votes
3 answers
578 views

Best microphone picking up sound within a small room?

I've tried several Electret Condenser Microphones as input to a generic USB audio sound card: MO064202-4 MO064402-4 MO064402-5 All mics work great at close range (about 1 or 2 inches). However, none ...
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25 votes
6 answers
11k views

Normal capacitor vs. audio capacitor

I'm building a power supply for old Schoeps CMT30F microphones. Standard condenser mic are 48V-powered nowadays, but these are 60s/70s Schoeps mic from RadioFrance/ORTF, customized at that time to be -...
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  • 1,688
0 votes
1 answer
677 views

Can I wire the ouput and Vcc of an electret condenser microphone amplifier and get the same signal out?

So I am using MAX9812 amplifier to build a microphone module, but from the pic you can see it requires 3 wires, vcc, ground and output. I was thinking to wire Vcc with output to get rid of one wire, ...
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1 vote
1 answer
273 views

Connecting Electret Mic to MT8870 Decoder Module

I'd like to connect the audio output of an Electret Microphone to the audio input of an MT8870 decoder module, which uses a 3.5mm stereo cable. I plan to power the mic at GND and VCC pins and connect ...
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  • 151
0 votes
1 answer
49 views

Unmatched connectors on condenser mic and wireless belt pack - make adapter?

So I want to buy a Shure Earmic (condenser) which has a mini XLR connector with 4 pins, one of them in the centre. And I want to connect it to an AKG PT40 body pack which has a three pin mini XLR ...
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  • 1
1 vote
3 answers
1k views

Microphone sensor for picking up voice from across the room

I'd like to create kind of a DIY Google Home using a Raspberry Pi and voice recognition software. I'm looking for a microphone sensor that will pick up my voice from across the room, but nearly all ...
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-1 votes
1 answer
505 views

How to connect microphone to computer? Pre-amp with galvanic isolation

I have audio card with Hi-Fi input, but it is strictly stereo TRS (not balanced). I have condenser microphone with balanced TRS output. I found that mic output is very low, and I receive too much ...
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  • 101
2 votes
1 answer
2k views

How do you calculate the required gain for an electret microphone amplifier?

Given that for example I have a -38dB mic such as this one, how can you calculate the gain needed to match the range of the ADC(5v)? I found this page explaining some basics, and some other questions ...
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  • 464
5 votes
3 answers
2k views

Electrical specification for minimum bias current available from 3.5mm cellphone microphone input?

If I understand correctly modern microphones integrated with headphones with 4-contact 3.5mm jacks for use with cell phones are condenser microphones, and usually contain a small, integrated amplifier ...
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  • 3,569
0 votes
3 answers
1k views

Combining two phantom power microphone capsules

I just bought a two channel wireless system for my accordion. It is two separate battery powered transmitters transmitting to a single dual channel receiver. It's good that I can have one microphone ...
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  • 101
1 vote
2 answers
7k views

How to get output voltage of microphone?

I am really confused at this moment. I have the following microphone: http://www.farnell.com/datasheets/1660938.pdf What I want to do is make a actual dB meter with this sensor. So I would net to ...
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0 votes
3 answers
128 views

Filter of DC does not work?

I have the following simple circuit: I thought that the capacitor under R1 can be used to filter off the offset of the DC, but instead I am still measuring (steady) voltage on the output. Is this ...
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2 votes
1 answer
3k views

Any tips on designing an audio preamplifier for low frequencies?

I'm currently trying to design an audio preamp with the purpose of amplifying very faint audio signals (possibly in the microvolt range) from 20-200Hz. I've tried both transistors and op amps for ...
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3 votes
1 answer
563 views

Capacitor microphone PSU - design question

I'm restoring a capacitor microphone PSU. Schematic is as follows I have an EE question about the existing circuit. [Whatever the answer, I'm going to replace the upper 4-5V heater supply with a 7805 ...
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1 vote
2 answers
1k views

How do I increase the signal to noise ratio in a true condenser microphone?

I made a simple condenser mic as a test project for something more functional. However, when I connect my microphone I only hear the mains hum. Using a factory-made condenser I hear the mains hum ...
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  • 35
2 votes
2 answers
224 views

Condenser Mic Noise Problem on SoundCard [closed]

I am very new in Electronics. I have Condenser mic with this following Spec in Short: model HT-D38 (brand HTDZ) Power Supply: Phantom Power 48V/DC3V It is working on Mixer by 48v Phantom Power very ...
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1 vote
1 answer
92 views

In current mobile phones, what are some specific techniques that prevent handling noise (rubbing, jostling) from being picked up by the microphone?

I've noticed that when using my smartphone the vibrations from my actions aren't picked up, or are picked up very faintly by the microphone. I've worked quite a bit with microphones and I know it must ...
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  • 123
0 votes
1 answer
3k 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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  • 101
0 votes
1 answer
155 views

Electrelet Microphone in Amplifier Circuit

I am trying to build this circuit with the only difference in my version being 9 volts instead of 12. For my Microphone I used a Electret condenser microphone from here. It says it runs on 2.2vdc so ...
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  • 213
1 vote
2 answers
1k views

Extremely low output from amplifier

I am unsure what is wrong with my amplifier / microphone coupling. I have read many of the posts on stackexchange including the following: http//electronics.stackexchange.com/questions/68525/...
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  • 113
1 vote
2 answers
2k views

Linkwitz mic preamp mod

I build and measure loudspeakers at home as a hobby. But I have never had a decent mic preamp for my unmodified Panasonic ECM capsules. I use a USB sound card to accept the mic audio and analyze it ...
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  • 109
5 votes
1 answer
3k views

Replacing a condenser mic with a MEMS mic

I'm working on a black-box piece of electronics which has a cylindrical "condenser microphone" with a main body diameter of 4 mm and height of 1.5 mm I want to replace the condenser mic (black box) ...
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