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Amazon.com: uxcell PNP NC 4MM Inductive Proximity Sensor Detection Switch DC10-30V 300mA : Industrial & Scientific
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interface - Interfacing an inductive proximity sensor with a Microcontroller using a sort of PNP-NPN transistors combination - Electrical Engineering Stack Exchange
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Inductive Proximity Sensor Switch Non-Shield Type Detector 2mm 10-30VDC 200mA PNP Normally Open(NO) 3 Wire – Heschen
What is the difference between PNP and NPN when describing 3 wire connection of a sensor? | Schneider Electric UK
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