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Bipolar transistors use both electrons and electron holes as charge carriers, allowing a small current injected at one of its terminals to control a much larger current flowing between two other terminals, making the device capable of amplification or switching.
Do you see the arrow on the emitter? An easy way to remember which round:
- NPN – Not Pointing iN
- PNP – Pointing iN
These are the very simplest form of the transistor, but are a great place to start, and are easy to get using. If you need help, check out our blog or contact our technical team via email for support.