Texel DM-3024
Bill,
Yeah, if you've already replaced the card once (did I 'hear' you say
that?), and there's been no change, I'm betting on the mike or it's cable.
Regarding headphones into the mike jack, actually headphones, speakers, and
microphones are very similar electrically and in the way they operate.
Mikes change physical movement (of their diaghram) into electrical
impulses, and speakers/headphones change electrical impulses to physical
movement.
Actually, if you connect a microphone to a speaker output (like a headphone
jack), and are VERRRRY careful (using VERRY low levels), you'll be able to
hear the audio coming from the mike. Mikes are very delicate though, and
very easy to "blow" with too much volume. Of course, impedences and such
are wrong, but it works well enough for a test!
Here's another idea…try the suspect mike with a known good tape recorder.
Check for bad connections also, by wiggle-ing the cable, especially where
it goes into the plug at the end of the cord, and also where it goes into
the mike itself.
Let me know!
Mark Haase