This Instructable (my first) will show you how to add an external mic jack so you can plug a lapel or headset mic into the EyeToy camera (and many other webcams) to be heard more clearly.
If you have an EyeToy and still haven't installed it on your computer, see this instructable Turn-a-PS2-EyeToy-Camera-into-a-High-Quality-Webcam.
Step 1: Gather the Supplies.
EyeToy (or other webcam with built-in mic)
Miniature mic cable
1/8" (3.5mm) switched phone jack (I used stereo)
Soldering iron with fine tip
Knife (you might need to trim the plastic)
Step 2: Open Up.
Lift the back edge (where the screws were) and slide back a little to remove the bottom cover.
Step 3: Remove the Board.
Step 4: Drill the Case.
Center punch the mark and drill a 1/16" pilot hole. Then drill the hole with the 1/4" bit using light pressure. You don't want it to catch this close to the edge and break it out.
Test fit the jack in the hole and see if you need to trim out any ridges or ream out the hole if you mis-marked or mis-drilled.
Step 5: Wiring the Jack.
Desolder the mic from the board, noting the polarity. Also desolder the two short wires from the mic. If you look closely you'll see that the black (-) wire is soldered to a pad with traces going to the case of the mic element while the white (+) wire is on the pad with no connections to the case. This is important because condenser mics are polarity sensitive and won't work if reversed. It might even burn out the preamp if reversed, then the element will never work again.
Solder the long shields to the barrel terminal of the phone jack. In my case the hole was too small for both shields to go into the terminal hole, so I wrapped one around the other shield and soldered it that way, but see if you can twist the two together and still get it in the hole. then solder the center wires, one each, to the tip terminal and and tip switch terminal. If you used a stereo jack like I did, leave the ring terminals alone.
Now solder the mic to the wire on the switch terminal, shield to the - (grounded to case) pad and center to the other. This is close quarters, so make sure the center wire isn't touching the other pad or the case. Solder the other wire to the board, center to + and shield to -. I decided it would be easier to solder it to the opposite side from original, coming in from the rear instead of going around to the front.
Check all of your connections for solder bridges.
Step 6: Reassembly
Once you're sure it's screwed in far enough for now, settle the board in position and seat the mic in its mounting tabs. Slip the cover back on and reinstall the screws.
Step 7: Enjoy!
Enjoy your improved voice to room ratio acoustics!