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The Circuit Diagram of Q-adjustable Band-stop Filter (741)

2017-02-12 07:54  
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The Circuit Diagram of Q-adjustable Band-stop Filter (741)
The notch frequency and the stability of Q depend on the passive components in the T-network. Appropriate components can make up a stable filter in this way. To build up a notch filter of high stability, passive components of high precision is needed besides high-performance operational amplifier. If R and C have the opposite temperature coefficient and R1, R have the same temperature coefficient, ω0 and Q are stable.