A series diode, or two diodes in parallel back-to-back, can serve as a useful alternative to a series resistor for this purpose.
串入一个二极管或两个反向并联的二极管可以作为一种有用的替代方法，起上述串联电阻的作用。
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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