Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [condenser-microphone]

51 questions
26
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6 answers

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 -9V or -10V powered. I need to add capacitors to…
Basj
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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 (amplification, power supply, High-end ADC, etc.) but…
DiskBiskit
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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) with a MEMS mic without redesigning the board. Does…
AlcubierreDrive
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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 of them would pick up any sound at ranges further…
Hari Wiguna
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5
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3 answers

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 - consisting of at least one FET and a few…
uhoh
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4
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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 PNP transistors at the XLR input are biased? A…
Vijayendra Kumar
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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 speaker will output a random high pitch frequency…
Jackson Medina
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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 (and the lower part with a TL783 jacked up to…
user207421
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Analog Android headphone command circuit not working together with microphone

I'm trying to make a headset with microphone (and stereo audio) for an Android phone. The headset will be connected to a 3.5 mm TRRS jack. I have read the specifications for such devices from Android Source. My schematic with working buttons…
TonninSeteli
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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 (but the audio will suck.) I designed a pre amp…
Rafael Mattei
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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 to the microphone and used frequency generator app,…
İlker Yapıcı
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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 on this site that give some ballpark numbers but…
Pepijn
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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 amplification but for some reason I never see any…
tacotacotaco
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Condenser Mic Noise Problem on SoundCard

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 well. but When I am connecting it to Sound card…
Dato Pilpilashvili
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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 with ARTA software. After thinking about it for…
oneoldude
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