2N3904

2N3904

2N3904 (40V, 0.2A)

is a widely used NPN bipolar junction transistor (BJT) that is designed for low-power switching and amplification applications. It can handle a maximum voltage of 40 volts and a maximum current of 0.2 amps, making it suitable for a variety of low-power electronic circuits.

has three terminals: the emitter, the base, and the collector. When a small current is applied to the base terminal, the transistor allows a much larger current to flow from the collector to the emitter. This makes theseful for switching circuits, where it can be used to control the flow of current to other components.

In addition to its switching capabilities, the can also be used as an amplifier in electronic circuits. When a small AC signal is applied to the base terminal, the transistor amplifies the signal and outputs a larger AC signal at the collector. This makes th useful for applications such as audio amplifiers, where it can be used to amplify low-level signals from microphones or other sources.

is a relatively low-cost and widely available transistor, and its versatility and ease of use have made it a popular choice among hobbyists and electronics enthusiasts. Its small size and low power requirements also make it well-suited for use in portable electronic devices.

4 is a reliable and versatile transistor that can be used in a variety of low-power electronic circuits, making it a popular choice for hobbyists, students, and professionals alike.