Use a computer headset/mic

Computer headset microphone pinout

Interfacing Microphones to Computer Sound Cards

Most sound card microphone inputs require a minimum signal level of at least 10 millivolts, but some older 8-bit cards need as much as 100 millivolts. The typical impedance of the PC soundcard microphone input is in order of 1 to 20 kohms (can vary from card to card). The microphone type which works best with computer sound cards is the electret microphone.

Sound Blaster soundcards (SB16, SB32, AWE32, AWE64 or Live) from Creative Labs have a 3.5mm (1/8 inch) pink stereo jack for the microphone input, with the following pinout:

  1. Signal input (tip)
  2. +5V bias (ring)
  3. Ground (sleeve)

Note: Most soundcards will wire the positive DC bias voltage to the ring, but a small number of non-standard soundcards can have the bias voltage wired to the tip. A few cards have a jumper which enables or disables the power to the microphone jack. If the jumper is put on, the bias voltage ( +5V through a few kiloohm resistor) is wired to the tip. Newer mainboards with stereo microphone support will provide the bias voltage for both the tip and ring.

The approximate schematic of a Sound Blaster microphone input circuitry shows that the +5V voltage on the connector is heavily current limited. The card's voltage might not be exactly 5V, but it is usually something between 3 and 5 volts when no microphone is connected.

Electret microphones

The electret microphone is the cheapest omnidirectional microphone you can buy. Very sensitive, durable, extremely compact in size, electret mics are used in many applications where a small and inexpensive microphone with reasonably good performance is needed. You can find them in almost every stereo equipment, in consumer video cameras, mobile phones and so on.

The electret is a modified version of the classic capacitor microphone, which exploits changes in capacitance due to mechanical vibrations to produce a small voltage proportional to sound waves. The electret does not need an applied (or phantom) voltage like the condenser microphone - as it has a built-in charge - but a few volts are still required to power the internal Field Effect Transistor (FET) buffer.

The bias is needed for the small built-in FET follower which converts the very high impedance of the electret element (tens of megohms) to an acceptable level (several kohms).

The circuit on the left shows a safe way to connect electret microphone capsules to old, non-standard soundcards. Build this circuit only if the simple schematic below does not work.

A simple modification which works with most soundcards is presented on the right. The circuit works because usually the power is fed to the microphone connector through a few kohm resistor and the DC bias on the tip is removed by the input capacitor inside the card.

How do I record using a microphone?

by newmusicman

I'm trying to record some music onto my computer by trying something along the following lines - getting a microphone that I can connect into my computer and using it to record sounds from my un-electric acoustic guitar and some finger tapping/creative drumming. I know it might sound like a stretch but I have a good idea of the sound I want. I've been doing this for some time while just jamming, I just dont know the technical details concerning recording it like what kind of microphone (condenser or stereo I dont really know much about any of that stuff), or what kind of cables or if I need a mixer or what ever the heck an XLR is that my roommate was telling me about, or the software that I would need

STARTECH.COM StarTech.com MUYHSMFF 3.5mm 4-Pin to 2x 3-Pin 3.5mm Headset Splitter Adapter - M/F
CE (STARTECH.COM)
  • This adapter is not a headphone splitter/Y-cable. It cannot be used to split the audio output to two separate sets of headphones or speakers.
  • Some laptops and mobile devices will not work with all external microphones. This is typically caused by an impedance mismatch between the microphone and the device...
  • To ensure proper hardware detection, we recommend that the external headset be plugged into the adapter first, before the adapter is connected to the computer or...
  • Turns a 3.5mm audio output port into two distinct ports - one 3.5mm headphone jack and one 3.5mm microphone port
  • It allows you to connect a microphone as well as external speakers.
WirelessFinest Headset Headphones + Adjustable Volume + Mute Control for Cisco Ip Telephone 7931 7940 7960 7970 7962 7975 7961 7971 7960 M12 M22 and All Series
Office Product (WirelessFinest)
  • Direct Connect Over The Head Headset, No Additional Applifiers / Adapters Required
  • Built-In volume adjustable and mute button control. Shirt clip included.
  • Soft Leathered Ear Cushions For All Day Comfort
  • Superior Quality Sound with the Flexible Adjustable Microphone
  • Headband Style with Single Earpiece for Great Sound Quality in One Ear
Webko Headset Buddy Adapter: PC Headset to CISCO Phone Jack, RJ9/RJ10 to Dual 3.5mm Adapter, Not RJ11
CE (Webko)
  • Use PC Headset with CISCO Phone RJ9/RJ10/RJ22 Headset Jack
  • PC Headsets Better & Cheaper Than Cisco Phone Headsets
  • Works With Both Mono & Stereo Computer Headsets
  • Not for RJ11 Jack Which is Wider Than Your Handset/Headset Jack
  • Works With Cisco-based Phone Headset Jacks - Avaya, Shortel, Etc.
adaptare Headset Adapter PC 2-x 3.5mm plugs > 4-pin TRRS jack for iPhone, Samsung, Android etc.
CE (adaptare)
  • Use your old-style PC headset with two separate 3.5mm plugs for headphones and mic on your phone, tablet or laptop computer with a single 4-pin TRRS jack for both...
  • 2-x 3.5mm female 3-pin connectors with color-coded functions (headphones and microphone)
  • 1-x 4-pin male TRRS 3.5mm connector. All connectors are gold-plated.
  • Length: 15 cm
  • The 4-pin plug has the pinout that Apple introduced and that has become the standard by now: L,R,GND,MIC (instead of the classical way of always having the Ground...
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