Circuits – PNP and NPN Transistors

I’ve decided to write this post to support a bit of the theory behind my new project that identifies the PNP and NPN transistors easily. (you should see my project after reading this post)

The difference between a PNP transistor and a NPN transistor is their polarity and their actions are reversed…

PNP Transistor

• A PNP transistor conducts from collector to emitter.
• When you increase voltage to the base of a PNP transistor, the transistor is turned off more and more until it no longer conducts and completely shuts off.
• And as you decrease voltage to the base of a PNP transistor, the transistor turns on more and more, until the transistor fully conducts from collector to emitter.

NPN Transistor

• A NPN transistor conducts from emitter to collector.
• When you increase voltage to the base of a NPN transistor, the transistor is turned on more and more until it conducts fully from emitter to collector.
• And as you decrease voltage to the base of a NPN transistor, the transistor turns on less and less, until the voltage is so low, the transistor no longer conducts across emitter to collector, and shuts off.

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