Active servo power is a power source that outperforms batteries and is especially suitable for audio equipment. Its high frequency burst signal adaptability and its own noise index are particularly good. Figures (a) and (b) are two practical circuits. The former is suitable for preamplifier circuits of audio equipment. The latter applies to power amplifier circuits.
The working principle of the circuit is: the common three-terminal regulator IC is matched with the high-speed operational amplifier, and the AC amplifier which constitutes the DC negative feedback by the operational amplifier amplifies the dynamic change signal of the output voltage of the three-terminal regulator, and then controls the three-terminal The output of the regulator, so that the high-frequency characteristics of the three-terminal regulator is greatly improved, improving the performance of the power supply. This power supply has two special requirements: (1) The op amp must be a high speed operational amplifier. (2) The input voltage of the three-terminal regulator must be higher than the output terminal by more than 5V, but it must not exceed the limit of the three-terminal regulation.
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