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求推荐芯片



输入是一个9V的干电池,随着使用电压会略微降低,输出是一个12V的恒压,并且该电压可在小范围内调节

我的目的是用一款恒压芯片结合一个干电池从而取代实验室里很大的恒压源,东西是要做成电路板的