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怎么利用开关垫片控制系统电源



有个开关,是那种垫片的,不是开发板上用的那种按下自锁的,垫片按下松手就直接弹起来了。用垫片做开关,按下时系统就通电了,再次按下系统就断电了,我想着是用D锁存器来控制,没想通,请问这种控制逻辑有推荐的方案吗