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2. Bipolar junction transistor - Wikipedia

   en.wikipedia.org/wiki/Bipolar_junction_transistor

   Structure and use of NPN transistor; arrow according to schematic. The diagram shows a schematic representation of an NPN transistor connected to two voltage sources. (The same description applies to a PNP transistor with reversed directions of current flow and applied voltage.)

3. 2N3906 - Wikipedia

   en.wikipedia.org/wiki/2N3906

   The 2N3906 is a commonly used PNP bipolar junction transistor intended for general purpose low-power amplifying or switching applications. [1] [2] It is designed for low electric current and power and medium voltage, and can operate at moderately high speeds. It is complementary to the 2N3904 NPN transistor. [3]

4. Push–pull output - Wikipedia

   en.wikipedia.org/wiki/Push–pull_output

   A Class B push–pull output driver using a pair of complementary PNP and NPN bipolar junction transistors configured as emitter followers. A push–pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load.

5. File:Bjt forward active bands.svg - Wikipedia

   en.wikipedia.org/wiki/File:Bjt_forward_active...

   Energy band diagram of a simple NPN w:bipolar junction transistor in forward-active mode showing electron energy versus position. The w:depletion regions of the emitter-base and base-collector junctions are marked.

6. Common collector - Wikipedia

   en.wikipedia.org/wiki/Common_collector

   Figure 1: Basic NPN common collector circuit (neglecting biasing details).. In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.

7. BC548 - Wikipedia

   en.wikipedia.org/wiki/BC548

   The BC548 is a part of a family of NPN and PNP epitaxial silicon transistors that originated with the metal-cased BC108 family of transistors.The BC548 is the modern plastic-packaged BC108; [6] the BC548 article at the Radiomuseum website [7] describes the BC548 as a successor to the BC238 and differing from the BC108 in only the shape of the package.