What are the applications of transistor amplification?

The transistor is a kind of control element, mainly used to control the size of the current, taking the common emitter connection method as an example (the signal is input from the base, output from the collector, and the emitter is grounded), when the base voltage UB has a small change, the base current IB will also have a small change, controlled by the base current IB, the collector current IC will have a big change, the larger the base current IB, the larger the collector current IC, on the contrary, the smaller the base current, the smaller the collector current, That is, the base current controls the change of collector current. But the change in collector current is much greater than the change in base current, and this is the amplification effect of the transistor. The ratio of the change in IC to the change in IB is called the magnification of the transistor ( =δic δib, δ indicates the amount of change. The magnification of the transistor is generally in the tens to hundreds of times.

When the transistor amplifies the signal, it must first enter the conduction state, that is, it is necessary to establish a suitable static working point, also known as establishing bias, otherwise it will amplify the distortion.

A resistor is connected between the collector of the transistor and the power supply, which can convert the current amplification into voltage amplification: when the base voltage UB increases, IB becomes larger, the IC also becomes larger, and the voltage drop of IC in the collector resistance RC is also larger, so the collector voltage of the transistor UC will decrease, and the higher the UB, the lower the UC, δuc=δub. FYI, please refer to the relevant books.

Can the transistor still work if it doesn't supply more current? Today is a long time to see.

The transistor can amplify the current and voltage signal, I studied this semester, and I feel like a TV or something needs a transistor to amplify the signal.

Last semester, our school studied analog electricity and digital electricity together, but digital electricity started seven weeks later than analog electricity.

Many electronic products are useful, such as semiconductor radios, etc., to amplify the received signal in order to better listen.

The transistor is used for many purposes.

For example, TTL gate circuits.

Three late dust electrodes.

Amplification principle: the change of the base current is small to control the change of collector current, adjust the triode to work in the best amplification area, when there is an AC signal input, the change of AC current controls the transmission junction current of the triode, so as to control the current of the triode collector, the current of the triode collector decreases the collector voltage, and the current decreases to increase the voltage, so the amplified AC signal can be obtained in the load.

Base. The three resistors are bias circuits, in which the adjustable resistors are used to adjust the bias current code to make the triode work in the best state. The collector resistor is the load resistor, the emitter resistor is the negative feedback resistor, and the emitter capacitor is the bypass capacitor.

The base capacitor is the input coupling capacitance.

The collector capacitor is the output coupling capacitance. The input signal voltage is added to the base by the input capacitor to form an input current, and the signal current amplified by the triode produces a voltage drop on the load resistor, which is added to the post-load through the output capacitor output.

The transistor has an amplification effect, which can amplify the input signal to the output. (1)

1.How the transistor works

The transistor is a semi-conductive finch device composed of transistor transistor, field effect transistor and bipolar transistor, and its working principle is to control the current between the collector or the source-drain, so as to realize the amplification of current or voltage.

2.Amplification mode of the transistor

The basic amplification modes include co-emission amplification, co-base amplification, and co-set amplification. Among them, the co-emission amplification mode is the most widely used and is usually used in single-stage amplification circuits.

3.Features of transistor amplification

Compared with other amplifier components, transistors have many advantages. For example, its internal structure is simple and more reliable; Its conversion characteristics are better and not easy to be distorted; At the same time, the gain and bandwidth of the transistor are also excellent, which is suitable for handling medium and high frequency signals.

4.Triode amplifier applications

Transistors are usually widely used in various electronic devices, such as RF amplifiers, audio amplifiers, TV signal amplifiers, etc. In addition, transistors have important applications in microwave communications, mixers, amplifiers, and television pre-amps.

5.How the transistor works

A transistor is a semiconductor device, the basic principle of which is to control the current between the collector or the source-drain by controlling the input signal, so as to amplify the current or voltage.

6.Current amplification effect

Current amplification is a type of amplification effect unique to transistors. When the input signal enters the triode, the structure of the triode will make the current in the output circuit greater than the current in the input circuit, so the amplification of the current can be realized.

Summary:

The three laughing pole tubes are a common semi-conductive trouser body device, which is mainly used to amplify the input signal. By controlling the current between the collector or the source-drain, the transistor can realize the amplification of current or voltage, and at the same time, in different amplification modes, the amplification effect of different characteristics can also be obtained, forming a wide range of application fields.

The amplification circuit is the use of electronic components with amplification characteristics, such as crystal transistors, after the transistor plus the working voltage, the small current change at the input end can cause the change of the larger current at the output end, and the change at the output end is several times to hundreds of times greater than the change at the input end, which is the basic principle of the amplification circuit.

To calculate the current and interpole voltage of the transistor, a direct current path (capacitor open circuit) should be used.

Base current: IB=IBQ=(VCC-VBEQ) RB collector current: IC=ICQ= IBQ

The basic principle of the transistor amplification circuit is to use the amplification characteristics of the transistor to increase the amplitude of the input signal. A transistor is a semiconductor device that consists of a base, emitter, and collector. In amplification circuits, bipolar transistors are typically used, which can be used to amplify voltage, current, or power.

The basic principle is as follows:

Input signal: The input signal is added to the base of the transistor through the input terminal. As the input signal increases, the voltage between the base and emitter also changes.

Activate the transistor: When the input signal is applied to the base, the voltage between the base and emitter is changed, causing the transistor to operate in a different state. This change causes a change in the current between the emitter and collector.

Output signal: The current change between the emitter and collector causes the output signal to increase, which enables the input signal to be amplified.

Through the reasonable design of the circuit, the amplification characteristics of the transistor can be fully utilized, so as to achieve effective amplification of the input signal. This is the basic working principle of a transistor amplification circuit.