Ticking sound in sync with cooling fan

I just started hearing a ticking sound in sync with the frequency of the cooling fan speed. I'm guessing it's a bearing going bad in the cooling fan but that sounds like the diagnosis on a car engine. Anybody have any experience with this?

You could, but it would probibly get better results if you measured the output of an audio amplifer that is being driven by the microhone. The problem is that microphones tend to be pretty low-level devices so reading them directly could cause noise problems.
In terms of an amp, unless you are particularly concerned about amplitudes, any cheap thing you could pick up at radio shack would work.
Mike...
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