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Very simple low pass filter(integrator) circuit diagram

2017-02-26 06:35  
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Very simple low pass filter(integrator) circuit diagram
Very simple low pass filter(integrator) circuit diagram
It is a simple low pass filter, it also can be used as integrator, when it is used as integrator, the switch S1 is connected to input terminal, and S2 is cut off. When it is used as low pass filter, R3 is connected to circuit, then the voltage amplification is Vo=R3/R1, the singal source internal resistance Ri << R1, and R2's value should be equal to the parallel equivalent value of R3 and R1. The frequency value is determined by the below formula: