posted 02-02-2001 04:14 AM
Sounds like a cool idea. I think it's odd that only two wires come out of the mic assembly, but like you said - it must be grounded on the chassis. I really don't know how to make the switch automatic. I'd have to sit down and draw a diagram to figure it out, but it's kinda late and my brain isn't working too well. 
If you want, you could install a mini DPDT (Double-Pole, Double-Throw) switch. That will let you select one mic or the other. Just wire the output leads (that go into the camera's circuits) to the two center poles, and the leads from each mic source to the two other pairs of poles. It would look like this:
That would be pretty simple to assemble with a good soldering iron and a skilled hand. 
Isaiah
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Isaiah Eyre, Sound Guy
"I don't know anything about music. In my line you don't have to." - Elvis Presley
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posted 02-02-2001 12:38 AM