一个相当基础的电路(留作练习，不过并不难)处理控制电压并输出与电压成比例的恒流。
A fairly basic circuit (left as an exercise, but it's not difficult) can take the control voltage and output a constant current which is proportional to the voltage.
输出电流不受供电电压波动的影响，实现了电路的恒流功能。
The output current is never influenced by power supply, realizing the invariableness of load current.
输出电流不受供电电压波动的影响，实现了电路的恒流功能。
The output current is never influenced by power supply, realizing the invariableness of load current.
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