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The circuit diagram of high Q notch filter

2017-02-19 13:04  
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The circuit diagram of high Q notch filter
This figure shows the circuit of high Q notch filter. The operational amplifier in the low figure comprise voltage follower. The potentiometer R4 can change the value of Q (from 0.3 to 50). And the notch frequency : f0=1/2πR1C1. To avoid the drifting of f0, silvering mica or carbonate capacitor and matallic film resistance are needed. To reach 60dB attenuation, the allowance of resistance is below 0.1% ,and the allowance of capacity is below. To make LM102 work steadily, a 0.01μF capacitor is needed to filter the power.