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Enjoy a variety of offers for a wholesale transistor blf177, bipolar transistor, JFET transistors, and much more. The transistors function as a gatekeeper for the circuit, letting specific currents flow. They use polarity to impede, enhance, or control the flow of electrons, having a PNP or NPN configuration. These abbreviations refer to the charge of each of their main components: the collector, base, and emitter. Some examples of an NPN transistor include the 2N3904, 2N2222, and BC547, which can all act as amplifiers. As an example of a PNP transistor, the 2N3906 can be cited, also being capable of acting as an amplifier.