File:Infrared-photogate-circuit-diagrams.png: Revision history

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9 May 2014

  • curprev 11:1311:13, 9 May 2014 Shawn talk contribs 247 bytes +247 Symbolic diagrams for active-low and active-high photo-gates, used for marking the passage of objects between a light source and a phototransistor sensitive to that source. An NPN transistor is used to provide a clean signal for micro-controllers.
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