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Active filter circuit with variable states

2017-02-13 05:19  
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Active filter circuit with variable states
The circuit shown in figure has 2 outputs UA1 and UA2, the former is a high -pass filter output, and the latter is a band-pass filter output. The operational amplifiers A1 , A2 , A3 and A4 can use quad op amp OP-11FY or a LM124. Capacitor should use polystyrene film capacitor, and its accuracy should be less than ± 10%.