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图1、)所示的双极性晶体管 Q_1在点 A、B 间呈现线性可调电阻。点 A、B 间可施加由运算放大器 IC_1~IC_5放大输出的电压范围内的任何电压值,A 点电位高于 B 点电位,调节 R_B 可使 R_(AB)达到最大值,调节电阻 R_K 的分压可使 R_(AB)达到最小值。如果可调电阻 R_B 的调节范围足够大,则可去掉电阻 R_K 和集成电路 IC_4。
The bipolar transistor Q_1 shown in Figure 1, shows a linearly adjustable resistance between points A and B. Any voltage within the voltage range amplified by the operational amplifier IC_1 ~ IC_5 can be applied between points A and B. The potential of point A is higher than the potential of point B. Adjusting R_B can make R_ (AB) reach the maximum and adjust the resistance R_K Press to minimize R_ (AB). If the adjustment range of the adjustable resistor R_B is large enough, the resistor R_K and the integrated circuit IC_4 can be removed.