二、电路设计 根据网络上的电路图重新绘制电路。由于现在手边还没有 8MHz 有源晶体，这里使用了 CD4049 搭建了一个 8MHz 晶体振荡电路。输出的 SWD接口也采用了自己平时制作电路的标准接口，包括有 SWD 信号线，UART信号线以及 RST 信号线。下面铺设测试电路。

IC voltage regulators are three-terminal devices that provide a constant DC output voltage that is independent of the input voltage, output load current, and temperature. There are three types of IC ...

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For example, a “Touch-Controlled Solid State Switch” in July 1982 (PDF), using a hex inverter chip (CD4049) and a small handful of passive components. But it’s the historical content that ...

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