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图片中运放管脚1与R2连接的作用是？
C3为什么与可变电阻Ra连接，作用是？
OP07是个低速精密运放；本身放大特性受置于频率，不同频率的放大倍数及移相差异很大。这图在没有参数时；有可能工作在正常放大区；也可能震荡。因此；就图而言；无从谈起放大倍数。
以图看，你已有仿真；建议以仿真结果做参考吧。
