🚀 go-pugleaf

in article <57916DMC109@PSUVM>, DMC109@PSUVM.BITNET says:
> 
> I remember seeing plans for a pulse monitor a while back in some magazine
> (Popular Electronics, Radio Electronics, etc.  I can't remember.)
> What I remember is a sensor that clipped on your finger.  Does anyone
> have plans for anything along these lines?
> Many thanks in advance.
> 
> Frank
  
  Your skin is invisible in the IR range. Your blood is opaque in that
range. All you need for a sensor is a IR led on one side and a IR 
photo transistor on the other side.

  Now, I've never actually built one of these, but I'm going to. Someone
is paying me to build a lie detector.

 The correct range is approx. 4000 to 7000 A I think.

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