Picture of Stereo Microphone
It has come time for me to update my home recording studio to continue recording my own brand of intergalactic low-fi, disco, funk, folk rock. Rather than spend big bucks on a stereo mic setup that won't offer me the low quality sound that I am accustomed to, I have decided to build my own for next to nothing almost entirely out of found parts. Now I can get awesome panning effects that can easily be mimicked in software, but never truly replicated.

For those that don't know what a stereo mic is, it is basically using two microphones to record to both the left and right audio channels of a stereo music track to give that "3D" effect.
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Step 1: Go get stuff

Picture of Go get stuff
You will need:

- A flexible lamp arm
- 24" x 6" sheet of 1/8" acrylic
- 12" x 12" sheet of 1/8" milky white acrylic
- A laser cutter (or handsaw)
- A heat gun
- An oven mitt
- Table clamps
- An IKEA clock frame
- Two metal washers
- Two 1" (or larger) rubber grommets
- Two dynamic microphones
- A dozen LEDs
- Two BC546 transistor
- Two 100uF capacitors
- Two 2.2K resistors
- Two 47K resistors
- A 220 ohm resistor
- A 5V power transformer (give or take 1 volt)
- Red and black solid wire
- A panel mount stereo jack
- An SPST pull cord switch
- A power drill (with assorted bits)
- Assorted hand tools

Step 2: Cut your acrylic

Picture of Cut your acrylic
Cut your acrylic using the following templates below.

One is for the bracket that holds the microphones, another other is a cover to make the base of the mic look all pretty-like and the last is a perf. board for building the circuit (print 2 or 3 of these using your extra scrap material after making the other cuts).

I laser cut them with a 75W laser with the following settings:
Speed: 12
Power: 100
Frequency: 5000

If you don't have a laser cutter, print out the template and tape or draw them onto your material. Proceed to cut them out with the tools you have.
EyüpY1 month ago


This is very useful .
kushalverma4 years ago
Hi Randofo,
I am also trying to make a desktop microphone(with my destroyed earphone which contains a mic.) at home with very simple steps can you help me to make it in a easy way plz help me ,mail me on vermakushal.28@gmail.com
I hate this new way to add comments, all the computers i have used it, have froze up, even on my quad core. Is there a way to change it back, BTW, Nice instructables.
Try using another browser.
I used 5-6.
ReCreate6 years ago
I dare you to (try) To say "Arduino Duemilanove" in it!(and upload the sound file)
randofo (author)  ReCreate6 years ago
Why that?
Just a random idea. ;)
Hatredman6 years ago
Good project! I know you wanted a lo-fi sound, BUT, to be fair, i must say that with this setup (wich resembles the ORTF quasi-coincident setup) you'll get a very unnatural phase distortion, even if the stereo image is a little wider. I would prefer a X-Y or coincident microphone technique. Easy to accomplish: just make sure the diafragms of the mikes are on the same vertical axis and 90 degrees apart.
Ditto - this doesn't strictly look like real ORTF (but it's kinda similar) and coincident/xy generally gives better stereo results... I reckon this setup would work best with omni mics (unlike proper ORTF), but dynamic omnis are rare... Still I guess it's supposed to be lofi, so... :)
Default1176 years ago
That's alot of parts for a seemingly simple device. 0_o
yeah. couldn't you just put two mics on a a special stand?
Rockin' the Stereo Street Swag! 've been wanting to do a stereo recording i'ble...
randofo (author)  T3h_Muffinator6 years ago
You should do one! Make us proud!
Default1176 years ago
VERY nice project! : D
It's funny, I just made one of these last week from 2 cardioid condenser mics, a piece of aluminum and an old tripod.

According to this site http://emusician.com/daw/emusic_going_wild/ (about halfway down the page)

"The ORTF technique, which specifies two cardioid mics 110 degrees apart with 6.69 inches between the capsules, was designed to mimic human hearing."

I set mine up the way they state and it works great. I have a Tascam US-122 USB sound card that has Phantom power on it hooked to an old laptop (Compaq presario, AMD K6), I use it for outdoor field recording (crickets, traffic, creek sounds, etc)
scoochmaroo6 years ago
rimar20006 years ago
This is very useful, thanks. I want to do one of these for me.
gmjhowe6 years ago
Very nice, i would have liked to have seen a little frame on either side, holding the mic's with elastic bands! especially if your holding it..
craig36 years ago
couldyou use this to record holyphonic sounds?