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.
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。
While Kibera has long been an obligatory stop for foreign dignitaries and film crews shooting movies such as The Constant Gardener, its addition to the tourist circuit has stirred debate.
尽管长期以来，基贝亚对于外国显要和拍摄《不朽的园丁》这类电影的电影业人员来说都是必经之地，但旅游圈也加入这一行列却引发了争议。
This circuit is restricted to low frequency operation by the lamp time constant.
受灯泡的时间常数限制，本电路只能低频工作。
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