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Questions tagged [condenser-microphone]

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2
votes
0answers
46 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
43 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 ...
0
votes
0answers
55 views

Parallel Electrets - working BUT

I know this question is similar to the previous one, but it has a slight tweak. I have 4 electret capsules in parallel supplied by 5V (USB supply). They work fine (so I guess the current hasn't ...
1
vote
1answer
100 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 ...
0
votes
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? ...
0
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0answers
43 views

Designing Mic with integrated preamplifier

I would like to design from scratch a battery powered large diaphragm mic with integrated opamp preamplifier to 3.5mm line out jack for pc. I have two capsules. One from a t.bone sc400 and one RK-47....
-1
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3answers
37 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?
0
votes
1answer
217 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. ...
0
votes
1answer
279 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 ...
0
votes
1answer
168 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 ...
4
votes
3answers
354 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 ...
25
votes
5answers
6k 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 -...
0
votes
1answer
349 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, ...
1
vote
1answer
164 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 ...
0
votes
1answer
40 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 ...
1
vote
3answers
810 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 ...
-1
votes
1answer
275 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 ...
1
vote
1answer
694 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 ...
4
votes
2answers
764 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 ...
0
votes
3answers
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 ...
1
vote
2answers
5k 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 ...
0
votes
3answers
115 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 ...
2
votes
1answer
2k 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 ...
3
votes
1answer
419 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 ...
0
votes
2answers
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 ...
2
votes
2answers
189 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 ...
1
vote
1answer
70 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 ...
0
votes
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 ...
0
votes
1answer
136 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 ...
1
vote
2answers
762 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/...
1
vote
2answers
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 ...
4
votes
1answer
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) ...