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DPRG: biasing & reading a phototransistor

Subject: DPRG: biasing & reading a phototransistor
From: Jay Couture jcouture at jcouture.utmem.edu
Date: Mon Aug 16 10:26:42 CDT 1999

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At 12:44 PM 8/14/99 -0500, you wrote:
>I'm working on adding encoders to Rover, the little Lynxmotion robot I
>brought to the meeting last week.  I've made some black & white striped
>discs & attached them to the wheels, and I found some "Reflective Object
>Sensors" (Optek OPB741) at Tanner's yesterday.  These consist of an IR
>LED and a phototransistor in one package, focused on a point 0.15" in
>front of the detector.  The spec sheet is at:

Try this circuit for a "digital" solution (i.e. without a comparator).

Jay
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- --=====================_934835202==_--

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