Step #1: Wire the binaural mic elements.PrevNext
- Cut two 3' lengths of wrap wire in each of 2 colors. Solder these to the first microphone element’s 2 contacts.
- Slide a couple inches of heat-shrink tubing over each connection, and heat it with a lighter. This will secure the connections. We want them to be as stationary as possible, as movement of these wires will create noise on the line.
- Twist the 2 wires together, but not too tightly. Slip on another piece of heat-shrink, this time over both wires. Slide it up to about 2" from the mic element, then shrink it.
- Repeat the same process with the second mic element. About 10" from the mic elements, slip another piece of heat-shrink tube over to combine all 4 wires. Keep track of which pair goes to which mic.
Step #2: Wire the stereo plug.PrevNext
- Open the stereo plug, and slide the cover over the 4 wires. Here’s the trickiest part: in order to have the correct stereo image, the wires on 1 of the 2 mic elements should be reversed. So, for one mic element, the red goes to a plug terminal, and the blue to the plug’s ground; on the other mic element, the blue goes to the second plug terminal and the red goes to the ground.
- Solder these connections, then screw the cover back on the plug.
Step #3: Disguise the mics as earbuds.PrevNext
Fasten the earbud cushions over the mic elements so that they’re large enough to sit comfortably in your ears. That’s it, you’re done.
Step #4: Record.PrevNext
- To hear exactly what’s being recorded, some folks will actually use a mannequin’s head to hold the binaural mic, and will hold the head in their hands while wearing a pair of normal headphones to monitor the sounds. Working this way creates the amazing effect of listening to a binaural recording as it happens, but keep in mind that if you walk around holding a dummy head out in front of you, you may attract attention (in fact, I think you’d get arrested in some places).
- With these stealth binaural mic headphones, as long as you’re in a situation in which it’s socially acceptable to be wearing headphones, you can record away, knowing that what you hear will be very close to what you play back later.
- For a schematic diagram and list of recordings, go to http://www.makezine.com/17/diycircuits_m....