SA555: 带负载时输出的周期跟频率与设计值偏差太大

无稳定态，为什么我的设计周期跟带载后的周期偏差很大，会是什么原因引起的

以下为我的设计值（未加负载，示波器的读值与设计值基本一致）

TH (高电平时间s) = 0.693* (1.2MΩ+ 10MΩ) *100nF≈776.16 ms

TL (低电平时间s) = 0.693*10MΩ * 100nF≈693 ms

T=TH+TL ≈1.46916 s

加负载后的

电路原理图

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