好吧问答库 > 数字电路555定时器问题

数字电路555定时器问题

2025年04月07日 03:59
有1个网友回答
网友（1）：

未有加二极管，要做到50%占空比就视乎R1和R2的阻值差距，如果R2比R1大多倍，就可以做到近50%的占空比，如最後程式 占空比=(R1+R2)/(R1+2R2) x 100%，R1可以忽略
=R2/2R2 x100% ≈ 50%
加二极管後(假设为理想二极管，单向导通零压降)，如果R1和R2阻值一样或相差不大，占空比就可以做到50%。
又加二极管後周期或频率会否改变，一样取决在R1 R2的阻值。

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