The amount of positive bias must be controlled for the specific application. It should be noted that the substrate is a positive (P) type material, and the emitter is a negative (N) type material. Generally, the 2N3904 transistor requires a positive bias from the base to the emitter, which means a positive potential on the substrate for the emitter. The bias is the idle current at the transistor terminals. A small change in base current results in a hundredfold change in collector current, which can be translated into voltage or power changes. This illustrates how the 2N3904 transistor is an amplifier. For a current gain of 100, a change in base current of 0.001 amps (a) results in a change of 0.1 amps at the collector. The various parameters of the 2N3904 transistor are referred to as β or current gain, which is the ratio of collector current to base current. Depending on the circuit configuration, a load or equivalent load can be connected to the emitter or collector. The emitter and collector are the main terminals of the 2N3904 transistor. The 2N3904 transistor has three terminals: an emitter, base, and collector. A larger collector current can be generated by injecting a small base current into the 2N3904 transistor. This small transistor is the counterpart of the 2N3906 transistor, a positive-negative-positive (PNP) transistor. It can be used for audio signals and medium-speed switching applications. The 2N3904 transistor is a bipolar negative-positive-negative (NPN) transistor usually suitable for negative ground circuits. We also provide you with a 2N3904 Datasheet pdf. This article will introduce you to the pinout, model, Introduction, features, specifications, applications, equivalent, and dimensions of the 2N3904 transistor.
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