Electronic technology can be described as the physical foundation of today's information age. As a technology for processing continuously changing signals in the electrical field, the core of analog electronic technology is signal amplification. Some problems are often encountered in analog circuits, such as: What are the main components in electronic technology? How do they work? How to use them to form amplifying circuits and processing circuits that meet the needs? Can you find the answers to these questions and the basic methods to solve them in the following article sharing.

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1. What are the general methods of inter-stage coupling of multi-stage amplifier circuits?

Answer: There are generally four types of inter-stage coupling in multi-stage amplifier circuits: direct coupling, resistance-capacitance coupling, transformer coupling and photoelectric coupling.

2. What four components do DC regulated power supplies usually include?

Answer: DC regulated power supply usually includes four components: transformer, rectifier circuit, filter circuit and voltage regulator circuit.

3. Is it better to have higher input resistance and lower output resistance of the amplifier? Why?

Answer: In the amplifier circuit, it is usually hoped that the input resistance of the amplifier circuit is high, because it has less influence on the signal source. Viewed from the output end of the amplifier circuit, the amplifier circuit can be equivalent to a signal source with a certain internal resistance. The internal resistance of the signal source is the output resistance. Usually, the smaller the value, the better, because it can improve the amplifier's load resistance. ability.

4. Why should the receiver add AGC circuit?

Answer: a. The received signal varies in strength, and the disparity is large. If AGC is not added, the output will fluctuate greatly, which will affect the effect.

b. In order to receive weak signals, the amplification of the receiver is always made larger, that is, the sensitivity is high, but when receiving strong signals, if the amplification of the channel is not regulated, there will be adverse consequences.

5. What are the general methods to suppress zero drift?

Answer: a. Adopt constant temperature measures;

b. Compensation method (using a thermal element to offset the change of the amplifier tube or using an amplifier tube with the same characteristics to form a differential amplifier circuit);

c. Adopt DC negative feedback to stabilize the static operating point;

d. Use resistance-capacitance coupling or specially designed modulation and demodulation DC amplifiers between all levels.