Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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White noise clicks on mic [closed]

I need to move Mic from the web camera (Logi c920). After I remove it from the board and put it on wires (about 10 cm) I have random clicks. I shielded wires and connect the shield to a case - it ...
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Designing of a ribbon microphone (sort of) output transformer

I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in ...
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Clap sensor Proteus simulation issue

I've been trying to connect an electret microphone into this circuit, although none of the imported electret microphones work. The circuit is designed to keep the LED open for about 1 second by the ...
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Calculating SPL in octaves from .wav file recorded with microphone in Python

I made a recording of my environment with a microphone with the following specs: The recording has a sample rate of 44.1 kHz and a bit depth of 16. I use: y, sr = librosa.load(latest_file, sr = 44100)...
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Are microphones with flatter frequency response charts better at picking up frequencies?

I am doing an experiment where we measure the frequency using computer microphones and use Audacity to find the peak frequency. If there was a sound at 1kHz, would a better microphone pick up the ...
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Electret microphone to speaker noise

I have been working on a circuit where part of the work involves an electret microphone that gets the input signal and outputs it through a speaker. It happens to have noise emanating from the speaker....
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How to wire a dynamic mono microphone with PAM8610 stereo audio amplifier

I am trying to make a audio amplifier with PAM8610. I have a dynamic mono microphone. In the PAM8610 official file they say that "To use the PAM8610 with a single-ended source, acground the INP ...
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Simple data over sound solution

I'm designing an access control and I'm evaluating different technologies to make the device unlock the access. One of the technologies I'm studying is integrating a microphpone in the device and ...
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voltage amplifier design feed by current source

I want to connect electret microphone with long wire to receiver. Usual way is to use balance line technology, but it can be expensive, then I've opted to use CCLD Constant Current Line Drive ...
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Does phantom powered audio system's ADC also works on 48v

Phantom powered microphones with their preamplifier can generate signal from -48 to +48 volt (or 24 or 12), then it run through wire and maybe receiver and reaches ADC. I want to know if 48v signal is ...
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Clap switch circuit too sensitive

I followed the clap switch circuit in this youtube video. The circuit is always ON. I replaced the condenser microphone with a photoresistor and the circuit is still ON. Which part is making the ...
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Microphone active low pass filter doesn't work

I am trying to make an active low pass filter for my school project. I need to design a filter with 2000 Hz cut off freq and 20-25 gain. I tried to use TI filter design tool and analog devices filter ...
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Monitor microphone signal on a USB oscilloscope

I would like to monitor a microphone signal on my cheap USB oscilloscope (LKHT00SU1.) I have tested it with a square signal generated from an Arduino. The microphone is a small one with a 3.5mm jack (...
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Data noise in bluetooth headset when coupled to an analog(ue) audio mixer via signal transformer

Long time (lurker) fan of StackExchange, first time poster. I am attempting to connect an Astro A50 bluetooth headset via its own basestation's analog(ue) combined line input/output (4-pole CTIA ...
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What should I consider for a live concert recording device? [closed]

I am a hobbyist archivist who likes to record concerts for the internet archives. I used to use a small battery powered device that recorded audio at cd quality of 44.1KHz/16-bit. This device was ...
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Anti-eavesdropping Electronics?

I remember reading about a device that does something like an acoustic heterodyne to overload the analog front ends of eavesdropping microphones. I did a quick search here didn't find anything related ...
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How to use the button on a headset?

I want to implement push to talk on my custom PCB. I apply a 2V DC bias on the microphone line of the jack through a 2.2k resistor. While pressing the button of the headset I see the resistance ...
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Frequency decoder circuit microphone not working?

Thank you Vladimir - I have I believe corrected the microphone element of the circuit but it is still not working. I've attached a fresh circuit diagram. I've added an LED to detect when the circuit ...
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Piezo contact mic into MacBook air

I'm wiring an external piezo as contact mic to the TRRS 3.5 jack of a MacBook Air. I'm following the instructions on this post: Piezo contact mic into iMac - avoid signal spikes However, the answer to ...
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Help understanding Phantom Power

I understand that 48 V is applied to both sides of the microphone signal with a 6.8k resistor (typically) as shown in this image: I'm looking to add a device INLINE with a microphone that I want to ...
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I2S slave communication without an MCU - how to generate the clocks?

I am designing an audio amplifier circuit which uses an I2S digital MEMS mic (INMP441) for picking up voice signals and an I2S class-D amplifier (MAX98357A) for amplification. I have attached the ...
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Identifying strange SMD audio capacitor

There is a a bypass capacitor in the path of the audio signal on a board (from B&K) which feeds a microphone with a few mAs of current in CCLD (constant current line drive) mode. I don't know its ...
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Does the DC-DC converter have any effect on the microphone?

I have had audible sound problems with some dc-dc converters. Especially the noises coming from the inductor. I need to use the this converter in a circuit that includes a microphone as well. This is ...
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I would like some feedback on my circuit design based on a DIY op amp circuit

I am following a design based on GreatScott's DIY or buy microphone op amp. I made some modifications and changes regarding the design, and made the schematic using Fritzing. This is my first time ...
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what is a good microphone for a real time voice activated switch? [closed]

My team and I are trying to build a voice-activated switch. We are trying to look for a good microphone that can pick up sound (as an analog input, no digital input) and it should also work at a ...
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Need help eliminating microphone buzz on streaming setup [closed]

I have a streaming setup which I'd like to power by socket and not on battery packs. The problem is that as soon as I connect any devices to my camera this way (charger) I'm getting a buzz on my ...
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Analog versus digital (I2S) audio transmission over 1-2m

I need to get a microphone signal to a microprocessor about 1-2m away via cable and I need it to be digitized at some point in this chain. I'm looking for a solution that draws something on the order ...
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Parallel electret microphones

I want to make an electret microphone setup for my accordion. 4 mics on the treble side and 2 on the bass side. Would I need a preamp for each mic and then mix the outputs using an opamp? Or would it ...
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Electret microphone: convert sound to current or resistance?

See this picture (from Wikipedia): The electret microphone consists of a capacitor with a static charge and a JFET. I wonder how the electrical signal relates to the sound signal. I understand that ...
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TRS to USB microphone wiring

I am trying to use a microphone pulled out from an old video recorder. I can use a TRS connector and plug it into the AV - mic in jack. I am curious if there is a way to use USB - A interface. In ...
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FET: How to understand noise specification?

I was reading an article about electret microphones and there was a link to a datasheet of the FET which was used for impedance matching. It is a popular Fet which is used in many electret microphones....
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Inject tone into computer

I'm using the circuit at the bottom of this post to generate a triangular wave, which I'd like to inject into a computer's microphone jack. My computer has a single audio jack. When I plug a TRRS ...
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4 answers
259 views

What is the input impedance of this circuit?

Here is the relevant part of the schematic of the Befaco InAmp, a Eurorack preamp for line level and instrument level signals: I am trying to determine whether I can safely connect the AKG c1000S ...
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USB port noise and how to deal with it, or avoid it?

I am designing and testing a DIY microphone. The idea is to amplify an electret mic signal before sending it to a PC's sound card to avoid using digital gain. The circuit just uses 2 opamp OPA2134PA, ...
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Connect amplified speaker output to microphone input

I am using a Sena 10r coms unit and I want to connect the output from the speakers to my GoPro wired mic input. The speakers are 70ohm 30mW each. How can I wire it to a 3.5mm jack? Most of the other ...
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How would you sample and store ultrasonic signals at 132 kHz using a microcontroller, Raspberry Pi, etc.? [closed]

I am attempting to sample and store analog ultrasonic microphone data. I am sampling at 12-bits. My ADC can sample fast enough, but storing to QSPI NOR Flash IC proved too slow, as did transferring ...
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241 views

Where to add equalization in active audio mixer?

I want a 2-input summing amplifier where I can adjust the amount of signal from each source with a single potentiometer. I intend to hook up two microphones (Shure SM57 and Audio Technica ATR 1500, ...
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Determining SPL experimentally with calibration data, output Vrms, and gain

Hi all I have a microphone calibrated at a SPL of 94 dB which produces an output Vrms of 1.7. I have an amplifier gain of 40 dB and need to convert measured Vrms values into SPL (dB). Should I solve ...
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Can XH-M562 TPA3116D2 be used to connect Headset(3.5 mm jack wired) as microphone as well as to listen to audio

I was thinking of doing a project wherein I will use my ESP32 as audio router. I will connect my wired earphone with the esp32 and esp32 will direct the audio from the smartphone to the earphone. But ...
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283 views

Is signal from electret microphone capsule (with FET) inverted?

Can I assume that the signal from an electret microphone capsule is inverted due to common source configuration of jfet? I would like to have non-inverted signal on my sound's card line input. Then I ...
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Telephone headset adaptor weak microphone and speaker sound

I have made a simple adaptor for a telephone P4C4 -- RJ9 -- separate headset output (The wiring diagram of a telephone handset can be viewed in this wikipedia article) to two TRS jack for an ordinary ...
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I need help with a microphone issue for my aviation headset [closed]

This is my first time asking for help in a forum so I hope I can do it properly. My problem is this: I have an aviation headset with a non working microphone and I would like to try make a microphone ...
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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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Why is this dynamic microphone grounded / wired with more than the two pins? is it important?

I am rewiring a dynamic microphone that does not require any phantom power (also wicked simple no off / on), and I noticed, when I only wire the two wires to two of the three pins it still works and ...
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Make microphone less sensitive [closed]

I bought a pack of 5 MAX4466 microphones on amazon, and would need to use them to detect when a plate is hit by a bullet. There are 4 plates, each one with a microphone glued to the back. The bullet ...
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STM32-based USB microphone produces hiss

I'm building a USB microphone based on STM32F407 discovery board, it captures audio but produces quiet but noticeable hiss with its spectrum shown below: I'm using oversampling to get additional 2 ...
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Need help identifying the 4 microphone wires in my laptop webcam

I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
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Op amp introduces phase shift at high audio frequencies

Context: I am trying to design a solid-state microphone preamp using dedicated audio op amps (ex: API 2520). Goals: flat ≈60-66dB of gain from 20Hz to 20Khz Limit changes in phase shift as much as ...
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Using a microphone to pickup ultrasonic sounds to trigger events

I'm building a PCB design that will trigger certain events when the onboard microphone picks up specific sounds outside of the range of human hearing. The desire is to be able trigger events remotely ...
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CTIA TRRS to 2 x TRS (for laptops): is the mic plug TR shorted together for bias power?

When you connect a (CTIA) mobile headset TRRS plug to a PC with separate green/pink jacks you can find Y-splitters TRRS(F) to 2 x TRS(M). My question: since the PC mic-in(pink jack) expects 3 ...
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