I think the answer would depend on what kind of mic you were using tha
picked up the EMI so well. A dynamic is essentailly a coil. So you could
easily reverse engineer a regular dynamic mic to detach its diaphragm but
leave th e coil and transformer circuit intact.
If it was a condenser than it may be mor edifficult. The only way I see
tha
you could modify a condenser mic would be to measure the actual mic
ele,emts
capacitance, than replace it with a regular capacitor of similar value.
Very
few people just happen to have capacitance measuring gear unless they are
already very far into electronics. Either way good luck!
"Albatross" <rjarnoldAToptushome.com.au> wrote in message
news:436b5151$0$25856$afc38c87@[EMAIL PROTECTED]
>
> "jh" <no@[EMAIL PROTECTED]
> wrote in message
> news:no-5E8816.01585104112005@[EMAIL PROTECTED]
> > Hi,
> >
> > I was hoping somebody here might be able to help me with a question.
> > First, some background. A couple of months ago I was trying to record
> > the sounds of the insides of my computer for an experimental sound
> > project. I first tried it with a cheap, crappy lapel mic that came
with
> > a pocket voice recorder. It worked just fine.
> >
> > Then I borrowed a fairly nice, high quality microphone and tried it
> > again. Sure enough, this microphone picked up a lot more sounds... in
> > fact, it recorded all sorts of beeps, buzzes, and hums that weren't
even
> > there, apparently some sort of electromagnetic interference. I was
> > amused to find that this high-quality microphone was much more prone
to
> > picking up this interference than the cheap one I tried earlier.
> >
> > The thing is, the interference sounds were much more interesting than
> > the real sounds. Holding the microphone near the graphics card, it
> > recorded different noises depending on what was being displayed on
> > screen. The fans sounded like something out of a science fiction
movie.
> > My personal favorite sound came from the power cord while the computer
> > was asleep: it made a bizarre sequence of changing pitches that
repeated
> > every couple of seconds.
> >
> > The only problem is, all of these great interference-caused phantom
> > sounds were almost drowned out by the actual normal sound produced by
> > the fans, hard drive, etc. in the computer. Needless to say, the
> > microphone was quite adept at recording these sounds.
> >
> > So my question is this: is it possible to build a device, or modify a
> > microphone, so that it picks up ONLY the electromagnetic interference,
> > but no actual sound?
> >
> >
> > Thanks,
> > Josh
> >
> > p.s.: I hope people don't mind that I'm not including my real email
> > address. It's probably bad etiquette, but I'm kinda paranoid about
spam.
>
> You could try using a guitar pickup instead of a microphone, they're
usually
> great at picking up Radiated Frequencies. :)
>
> Cheers,
> Ric
>
>
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