这部分电路的作用有几种

Components Q2, R32, and VR1 comprise a simple series-passregulator to remove the line frequency ripple component from the secondary bias supplyand set its voltage to ~10 V. This regulation cleans up the output voltage and current ripple by removing line frequency components for the secondary bias. It also removes any influence of the bias supply on gain-phase characteristics in both voltage mode andcurrent mode operation.

资料中提到了这么段话，除了知道是提供运放的供电电压外，还有什么作用，希望谁能详细讲解一下。