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Active filter with variable state circuit

2015-02-03 03:22  
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Active filter with variable state circuit
Circuit has two outputs which are named the UA1 and UA2. The former one is called high-pass filter output, and the later one is called band-pass filter output. Four-operational amplifiers four operational amplifiers OP-11FY or LM124 can be used for operational amplifiers A1, A2, A3 and A4. Polystyrene film capacitor can be used and its accuracy should be within ± 10%.