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by disinfoniacs #69 & #1

transistors

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tldr

• Transistors are made of three layers of semiconductor material and control the flow of current or voltages in a circuit.
• Transistors can be used as electronic switches or amplifiers.
• When used as an amplifier, a transistor creates gain, meaning the output voltage or current is higher than the input voltage or current.
• Transistors are often used as the primary gain-producing component in an RF power amplifier, which amplifies radio frequency signals.
• There are two types of transistors to be aware of for the ham technician exam: Field-effect transistor (FET) and bipolar junction transistor (BJT).
• FETs are often used in low-power applications such as preamplifiers and have three connections: gate, drain, and source.
• BJTs are often used in high-power applications such as power amplifiers and have three electrodes: emitter, base, and collector.

in depth

Transistors are important components in electronics and ham radio. They are made of three layers of semiconductor material and can control the flow of current or voltages in a circuit. This makes them useful for many applications, such as electronic switches or amplifiers.

When a transistor is used as an amplifier, it creates gain. This means that the output voltage or current is higher than the input voltage or current. Transistors are often used as the primary gain-producing component in an RF power amplifier, which amplifies radio frequency signals.

There are two types of transistors to be aware of for the ham technician exam. The most common type is the field-effect transistor (FET), which typically has three connections: a gate, drain, and source. FETs are often used in low-power applications, such as preamplifiers. The other type of transistor is the bipolar junction transistor (BJT), which has three electrodes: emitter, base, and collector. BJTs are often used in high-power applications, such as power amplifiers.

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