There are two kinds of output characteristics of the power amplifier: one is a fixed-resistance output, and the other is a constant-voltage output.
1. Fixed resistance output
The power amplifier of the transformer coupling is a fixed-resistance output characteristic. In this output circuit, the load impedance is determined to be constant. After the primary side and the secondary side of the output transformer in the output stage of the power amplifier are determined, the impedance of the speaker cannot change.
2. Constant pressure output
The so-called constant voltage output means that when the magnitude of the load impedance changes within a certain range, the output signal voltage at the output of the power amplifier does not change with the change of the load impedance. Power amplifier circuits such as OTL, OCL, and BTL have characteristics of constant voltage output.
In a power amplifier with a constant-voltage output, the impedance requirement of the load (referred to as the load of the power amplifier) is not as strict as that of the fixed-resistance output, and the load impedance may vary somewhat without affecting the normal operation of the amplifier, but the power obtained by the load will be It varies with load impedance.
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