cd4017输出电流不够用怎么办？ ne555和cd4017最大输出电流
\u600e\u4e48\u63d0\u9ad8cd4017\u82af\u7247\u7684\u5de5\u4f5c\u7535\u538b\uff0c\u60f3\u752836V\u7535\u538b\u6765\u4f7f\u7528\u8fd9\u4e2a\u82af\u7247\uff0c\u4e0d\u77e5\u9053\u6709\u4ec0\u4e48\u529e\u6cd51\uff0cCD4017\u82af\u7247\u8bbe\u8ba1\u5c31\u51b3\u5b9a\u4e86\u5b83\u4f7f\u7528\u7684\u7535\u538b\uff0c\u4e00\u822cTTL\u4efd5V\u548c3.3V
2\uff0c\u5982\u679c\u9700\u8981\u4f7f\u752836V\u7535\u6e90\u6765\u9a71\u52a8\uff0c\u90a3\u4e48\u9700\u8981\u5728\u4e2d\u95f4\u52a0\u4e00\u4e2a7805 \u4e4b\u7c7b\u7684\u7a33\u538b\u82af\u7247
3\uff0c\u4f60\u53ef\u4ee5\u5728\u7f51\u4e0a\u641c\u7d22\uff0c\u8fd9\u4e2a\u82af\u7247\u5c31\u4e09\u4e2a\u811a\u8f93\u5165\uff0c\u63a5\u5730\uff0c\u8f93\u51fa\uff0c\u4f7f\u7528\u7b80\u5355
ne555\uff0c\u7535\u538bVDD=15V\u65f6\uff0c\u6700\u5927\u8f93\u51fa\u7535\u6d41200mA\u3002
CD4017\u8f93\u51fa\u7535\u6d41\u548c\u7535\u6e90\u7535\u538b\u6709\u5173\uff0c\u8f93\u51fa\u4f4e\u7535\u5e73\u65f6\uff0c\u8f93\u51fa\u7535\u6d41 VDD=5V\u65f6 0.51mA\uff0cVDD=10V\u65f6 \u7535\u6d411.3mA\uff0cVDD=15V\u65f6 \u7535\u6d413.4mA. \u8f93\u51fa\u9ad8\u7535\u5e73\u65f6\uff0cVDD=5V\u65f6 \u8f93\u51fa\u7535\u6d41-0.61mA\uff0cVDD=10V\u65f6 \u7535\u6d41-1.5mA\uff0cVDD=15V\u65f6 \u7535\u6d41-4mA.
下图是一个CD4017电流（或电压）扩展电路。
4017的输出脚通过晶体管放大电流带动继电器，只要配置合理，理论上可以无限驱动大功率元件。
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