--- In "j.chitte" <> wrote:
>
> --- In "imthemoonman" <imthemoonman@> wrote:
> >
> > Any suggestions/reassurance is greatly appreciated.
> >
>
> You will get a hell of a lot of spurious high frequency data and a lot of
> d.p. to do to extract something useful from a sound recording of your heart.
>
> It may be better to look at another analogue proxy of blood flow or at least
> some simple buffer/filter op amp cct on the mike.
>
> Some simple heart rate monitors use a light on your finger tip (like a torch
> makes you finger glow red). The light tranmitted varies with the blood flow
> and you can pick up a clean slow moving signal with an opto sensor. this may
> be more use than trying to detect the envelop of an audio frequency AC input.
http://www.circuitcellar.com/library/print/1204/Bachiochi173/index.htm
Pulse-ox and HR project.
regards ......... Charlie
> If you are talking about the std ADC on the TS boards be very careful not to
> exeed 3V. These inputs on-chip inputs of the EP9203 . If you get too careless
> you could blow the whole thing. At the very least it's easy to take out the
> input permanently.
>
> Keep us posted, I thought of doing this myself at one time.
>
> HTH
>
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