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The bridge type T circuit of reducing the components of Notc

2014-11-17 14:12  
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The bridge type T circuit of reducing the components of Notch filter
The double-T circuit with less number of components achieves the notch filter circuitry, as well known as the T-bridge circuit, its application is few . Figure 1 is a typical example. In the circuit, the arrangement of substitute resistors and capacitors is neglected because of imbalanced value of capacitance. In this circuit, the ratio of resistors R1 and R2 make zero frequency with the largest attenuation changed. When R1 = R2 = 16kΩ, C = 0.01μF, fo = 11kHz, a large amount of attenuation is available. But when it is used, the condition is R1> R2, which is not very simple.