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mc34063升压遇到问题



用mc34063做了一个7.8升12的电路,通电之后输出只有7.8v左右,电感几乎没有声音,二管脚没有波形,感觉电感没有泵升的左右,直接输入直流穿过电感到达输出端,是不是频率问题