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下图所示的电路只需用两个按钮即可控制ＬＣＤ的偏置电压。按钮控制Ｘ９５１１的加计数端（ＰＵ）或减计数端（ＰＤ）即可增加或减少滑动端（Ｖｗ）相对电阻低端（ＶＬ）的位置，从而改变Ｑ１的基极电流，因此也改变了加在ＬＭ３３７调整端（ＡＤＪ）的电流。该电路相当于电阻?
The circuit shown below can control the LCD bias voltage with just two buttons. Pushbutton control of the X9511’s up-count (PU) or down-count (PD) increases or decreases the Vl relative to the low side (VL), thereby changing the base current of Q1 and thus changing Current at the LM337 ADJ. This circuit is equivalent to the resistance?