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Views: 16 Author: Site Editor Publish Time: 2023-06-14 Origin: Site
Gain is one of the main indicators of the power amplifier. It is the product of the direction coefficient and efficiency, and it is the performance of the antenna radiation or the size of the received electric wave. The choice of gain size depends on the requirements of the system design for the radio wave coverage area. Simply put, under the same conditions, the higher the gain, the farther the radio wave propagation distance will be. The larger the receiving gain value of the power amplifier, the stronger the receiving performance.
Transmission gain of power amplifier
Protection measures of power amplifier
Refers to the ratio of the output power of the amplifier to the input power, and the unit is often expressed in "dB" (decibel). The output gain of the power amplifier increases or decreases as the frequency of the input signal changes. This indicator is the most important basis for assessing the quality of power amplifiers. The smaller the decibel value, the flatter the frequency response curve of the power amplifier, the smaller the distortion, and the stronger the signal reduction and reproduction capabilities.
The power tube is the most vulnerable device in the power amplifier circuit. Most of the damage is because the actual power dissipation of the tube exceeds the rated value. In addition, if the power amplifier and the speaker are mismatched or the speaker is overloaded for a long time, the speaker will be easily damaged. Therefore, in audio equipment, the purpose of protection is to protect expensive power amplifiers and speakers, so overload and short-circuit protection for power supplies, power amplifiers, and speakers is necessary.
1. Power supply protection: When using a switching power supply, there is a special protection control terminal, as long as the over-current or over-voltage signal is input, the protection purpose can be achieved.
2. Power amplifier level transistor protection: In addition to paying attention to the ambient temperature and selecting a suitable radiator during use, the power amplifier transistor is mainly to consider over-current and over-voltage protection issues. The applied integrated circuits are equipped with current-limiting protection and thermal cut-off protection functions, so attention should be paid to over-voltage protection when making self-made power amplifiers.
3. Speaker system protection: The protection of the audio system has two meanings: one is the overload of the audio speaker. The other is not the excessive audio power, but the offset of the DC potential, which causes the speaker of the OCL or BTL circuit without capacitive isolation to burn out.
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