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。
However, you can use a large variety of diodes here, my next choice would be a regular purpose 1N4001 or something and should be used if your relay type can handle more then 1 amp.
但是，您可以使用一个二极管这里种类繁多的，我的下一个选择将是一个经常性的目的，1N4001或放东西，应该使用如果你的中继类型可以处理更多然后1。
应用推荐