![]() ![]() If you started from the right side, then the first pin is the collector, the second pin is the base, and the third pin is the emitter meanwhile, If you started from the left side, then the first pin is the emitter, the second pin is the base, and the third pin is collector, and this applies if you have an NPN transistor. So, therefore, the first thing to do is put the resistor on its backside, where its frontal side will be facing you, then label the pins with numbers. The plastic-cased transistors have two sides, the first one is a flat side, and it’s called the frontal side, while the second one is concaved and it’s called the backside. The identification process differs from the plastic-cased transistor to the metal-cased transistors, for example: Plastic-Cased The bipolar junction transistor can have either NPN or PNP, and it can have either a plastic or metal casing. Source Identifying Transistor 3 Pins Without Multimeter (PNP or NPN) How to Identify Line and Load Wires? – 4 WaysĬan I Run Ethernet And Power In The Same Conduit? How To Identify Switch Live Wire? Easy Thing! Why Does a Potentiometer Have 2, 3 & 6 Legs?… If it shows reading, it’s an NPN transistor, but both pins on the side must show reading whether it was a PNP or NPN transistor. If it shows reading, then it’s a PNP transistor you can also place the red probe on the middle pin of the transistor and then put the black probe on any of the pins on the side. First, grab the multimeter’s probes (the black and red cables), place the black probe on the middle pin of the transistor, and then put the red probe on any of the pins on the sides. To differentiate between PNP and NPN transistors or the bipolar junction transistors, you must use a multimeter. ![]() How To Differentiate Between PNP and NPN Transistors?
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