The PNP transistor works in the opposite. In PNP transistor, current normally flows from the transistor's emitter to the base, and when enough current flows from emitter to the base the transistor turns on directing current from emitter to collector. Briefly, the NPN transistor requires positive current from the base to the emitter and PNP requires negative current to the base, but current must flow out from the base to ground.
Various optical, inductive, capacitance, etc. Learn more. Most industrial proximity sensors inductive, capacitive, ultrasonic and photo electric are solid state. The term solid state refers to the type of components used within the sensor. Solid state electronic components such as transistors are used to switch the output of the sensor upon detection of an object. Related FAQs. What are Inputs and Outputs? Related Products. Related Range. Contact Us.
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