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Bart woz fourth-stage active low-pass filter circuit

2017-02-16 17:01  
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Bart woz fourth-stage active low-pass filter circuit
This device is designed as the Bart woz fourth-stage active low-pass filter circuit that can be used to filter the very low frequency random impulsive noise interference voltage of the DC level signal, the cut-off frequency (-3dB) is about 8Hz, the gain reduces 20dB when the frequency is 18Hz. The pass-band natural attenuation is 0.467. The input resistance is about 40kΩ. The filter network resistor is composed of some metal film precise resistance. If the 1μF capacitance has the good precision, the cut-off frequency fc closes to the theoretical value.