Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [electret]

A material with a permanent electric charge. Commonly used in the electret microphone.

A material with a permanent electric charge. Commonly used in the electret microphone.

110 questions
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Electret microphone: selecting a bias resistor

I have inherited a circuit from a colleague using a MAX4063 pre-amplifier and an electret microphone. It's almost identical to figure 4 from the preamp datasheet: But where that circuit has 2× 1 kΩ resistors in series, I have just one. I'm not…
pjc50
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Electret Microphone Preamp Circuit

The following electret microphone preamp circuit seems to work pretty well. My electret model is a little off because on the bread board R6 needs to be ~33k to get the output at 1/2 supply. Just a little explaination: The current mirrors provide a…
squarewav
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Microphone mute anti-pop circuit works but still picks up a little audio

I built a simple microphone mute circuit that appears to be pretty common. It mutes the mic without making a popping sound by shorting the connection through a capacitor. It works pretty well, but if I blow into the mic or tap it hard, it is able to…
kr4sh
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How to analyse the circuit performance of an electret microphone

I have a simple circuit that amplifies the output of an electret to drive a simple volume visualisation with an array of LEDs. I didn't design the circuit (though I did build it - works fine), but ignoring whether this is a good circuit or not, I…
tardate
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What determines an electret microphone voltage?

I am trying to get an electret microphone working with my Raspberry Pi Pico's ADC pin. I am trying to detect the output by passing it through a transistor. I have a 4.5V voltage source. I split this with a voltage divider to create a 3V input for…
user10709800
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What makes an op-amp good for electret microphone preamp vs other op-amps?

What makes an op-amp good for use in an electret microphone preamp vs other op-amps? Being JFET, current bias, voltage bias, etc? Does an op-amp that requires a negative voltage supply work better or not (related to electret) than a op-amp that does…
Radu
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(Electret Microphone) Why is input taken from the capacitor?

Why is the input signal taken from the -ve side of the capacitor? I do understand that the resistor has been added for voltage divider. Is this actually for filtering purposes? Or is the capacitor there just to block the DC?
Tashfi Nowroz
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How can moving my foot possibly affect electronics meters away?

I'm curious about a strange effect I observed. I was designing a device, which sleeps most of the time and can be woken up by a loud sound signal, like an opening door, a clap, etc. The relevant part of the schematic: simulate this circuit –…
anrieff
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What do these passive components do in this microphone amplifier circuit?

I have this circuit I built long ago to amplify 2mV signal from speaker and phase shift it by 2.5V. Now the question is, what does C2, C4, R5, and R6 exactly do?
gargoor
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Peak detector and amplifier for electret microphone

I've designed a circuit for detecting peak levels of a electret microphone. I've tested the circuit before manufacturing 100 units and it worked nice. After testing the 100 PCB I've received, only 32 of them works as it's supposed to. The units…
Alpha
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Electret microphone to USB soundcard

I am trying to interface a suite of aviation audio headsets to my PC. The headsets use an electret microphone requiring a voltage bias of 8V - 16V for power. Each headset plugs into its own instance of the following circuit and USB soundcard and…
Richard Long
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Can I connect multiple electret microphones for better gain?

Is it possible to connect multiple electret microphones in order to increase sensitivity (gain) of the microphone(s)? If yes, how do I connect them? Update: Obviously one solution is to increase the number of amplifiers, but I am curious if multiple…
Gabriel
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Amplified electret mic gives a lot of low frequency noise

I am trying to build a circuit that amplifies an electret microphone. I have made it based of a youtube video. The microphone sort of works at this point, however there is huge amounts of noise around 0 to 100 Hz. I have connected the mic to my PC…
SjoerdvdBelt
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transistor mic preamp

Hi I built this mic preamp circuit for use with an electret mic. The mic I have is this PUI AOM4544 electret mic I have plugged this mic preamp circuit to my soundcard line in. But I think the gain is so low that I cannot hear anything. I built…
buzzy
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Do electret microphones have polarity?

So do electret mics have polarity? The following circuits seem to contradict each other... 1) 2) Now the problem is one image shows polarity while the other one does not!! What's the holdup here?
Parth Sane
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