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为什么不能用5V单片机IO口直接通过一个三极管来控制12V电源的开断?而是需要一个NPN+PNP才可以啊



为什么不能用5V单片机IO口直接通过一个三极管来控制12V电源的开断?而是需要一个NPN+PNP才可以啊