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What is the difference between PNP and NPN when describing 3 wire connection of a sensor? | Schneider Electric UK
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power electronics - question about signals from NPN - 4 -wire proximity switch - Electrical Engineering Stack Exchange
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10pcs New LJ12A3 4 Z/CX 4 Wires Inductive Proximity Sensor Switch 4mm Detection Normally Open+Close NO+NC NPN DC6 36V|Switches| - AliExpress
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