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Hello
请教下这张电路图的工作原理。左上角的7脚输入24V电源，电流源电流为2.5mA。流过6，5，4的Relay，1常开，1常闭。U3驱动另一个Relay输出结果。请教下这个电路图的工作原理。如何形成一个电流源。谢谢！
