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LM317 制作数控电源

Other Parts Discussed in Thread: LM317

各位大神 我想用LM317和单片机做个数控电源。准备用个DA 提供给LM317 做基准电压

我知道LM317 的输出电压公式 V0=1.25*(1+ R1/R2) 。但是 我想用单片机 控制DA的基准电压 进而控制LM317 的输出电压 应该怎么做呢? 谢谢