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From: John Popelish
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Subject: Re: Amplified stethoscope?
Date: Thu, 05 Dec 2002 00:31:55 GMT
NNTP-Posting-Date: Wed, 04 Dec 2002 19:31:55 EST
> I need a stethoscope that has an RCA or mini plug output instead of
> the usual earpieces. The cheapest commmercial one I've found is
> $189, but I just know it has to be easier than that. Combined
> with video, this would be for demonstrating/documenting blood
> pressure readings. I need to be able to record the sound you would
> hear through the stethoscope.
> Has anyone here ever built such a thing?
> I thought of maybe just cutting the tubing and inserting a
> microphone. I just happen to have an electret condenser mic left
> over from some other project (Radio Shack 270-090), and maybe I
> could just use that.
> That should be easy enough to check out, but I thought I'd just see
> if someone here had already invented this wheel.
> Thanks in advance for any suggestions.
Don't put at the far end of the tubing, but as close to the pickup
bell as possible. You should also add a small vent hole between the
diaphragm and the mic, so that it is not possible to pressurize the
front of the mic with trapped air.
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