List of Parts:
Condenser mic cartridge (I got mine from the component bins at Radio Shack)
10.0UF/100VDC metal-poly capacitor
1000PF 100V ceramic disc-style capacitor
9V battery snaps
2.21K ohm 1/4W 1% metal film resistor
Male XLR plug
9V battery holder
Casing for the mic (I used a Zhena’s Gypsy Tea tin)
Heatshrink tubing (optional, but can help prevent shorts)
All parts can be found on DigiKey.
Originally posted this (along with the schematic) on my blog. You can contact me there if you have questions.
Step 1: Prepare the Microphone Cartridge
Step 2: Prepare the XLR Plug
Step 3: Connect the Battery
Step 4: Prepare the Case
Carve out a few holes in your tea tin. You’ll need three on the bottom (one for the XLR plug to fit through, two for the screws to hold it in), several on the top to allow sound in, and two on the side for the screws for the battery holder. I used a box cutter and a twisting, drilling motion for this, though I would recommend a dremel or something of the sort if you have access to one. As you can see in this photo, I slipped a bit with the box-cutter while cutting out the XLR hole, which led to a bit of trouble in actual use with the action of connecting and disconnecting the mic breaking the thin bit of metal left around one of the screws.
Step 5: Put It All Together
And there you have it!
Based on the project at www.christianmusicweb.com/microphones/mic_project.html
Original instructions posted at http://cyanyears.wordpress.com/2010/12/22/how-to-make-a-condenser-mic-for-under-20/