The percent change can be reduced with a series resistor.
百分比的变化可以用一个串联电阻降低。
Product introduction: RX21 series resistor is lacquered wire wound resistor.
产品介绍：RX21型电阻器为被漆型绕线电阻器。
A useful alternative to a series resistor is a series diode, or two diodes in parallel back-to-back.
一个有用的方法是用一个串联二极管或者两个背靠背并联的二极管代替串联电阻。
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