Microphone amplification and mixed value amplification circuit diagram
The power amplifier can be composed of discrete components or an integrated power amplifier. The former is often used in high-power or higher-demand audio systems, the latter is often used in low-power or less demanding audio systems. In addition to the characteristics of light weight and small size, the integrated power amplifier only needs few external components and can work without adjustment. Therefore, it is widely used in audio equipment such as radios, recorders, and televisions. The use of integrated power amplifier should pay attention: in any case, the integrated power amplifier can not work under the working conditions specified by the limit parameters or absolute ratings. Even if the working state of the circuit exceeds the limit parameter value instantaneously, it may cause immediate damage to the circuit or degradation of the electrical performance of the circuit.
Microphone amplifiers are small-signal low-noise amplifiers, which are commonly used in discrete component circuits. In order to reduce noise, the general operating point is selected to be low, and the design method is the same as that of general amplifiers. Low-noise operational amplifiers can also be used, and non-inverting amplifiers with high input impedance can be used. The circuit is shown in the figure:
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