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PNP transistor

PNP transistor is a semiconductor device with a structure opposite to that of an NPN transistor. It has an N-type layer situated between two P-type layers. In a PNP transistor: When you apply current to the base of a PNP transistor, which controls the current between the emitter and the collector, the transistor turns on. …

NPN transistor

NPN transistor is a semiconductor device used as a switch or amplifier of electrical signals. It has a structure opposite to that of a PNP transistor. In an NPN transistor: It consists of three semiconductor layers – one N-type (negatively charged) layer located between two P-type (positively charged) layers. To open and activate an N-P-N …