YOUMILE 5 Pack Slot Type IR Optocoupler Speed Sensor Module LM393 for Arduino
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Working voltage: 3.3V~5V Dimensions: Approx.3.2 x 1.4 x 0.7cm 5mm Groove width Using wide voltage LM393 comparator Application: Widely used in dynamo speed detecting, pulse counting, etc
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Amazon
Working voltage: 3.3V~5V Dimensions: Approx.3.2 x 1.4 x 0.7cm 5mm Groove width Using wide voltage LM393 comparator Application: Widely used in dynamo speed detecting, pulse counting, etc
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Working voltage: 3.3V~5V Dimensions: Approx.3.2 x 1.4 x 0.7cm 5mm Groove width Using wide voltage LM393 comparator Application: Widely used in dynamo speed detecting, pulse counting, etc