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Three audio band-pass filters circuit

2015-02-04 18:54  
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Three audio band-pass filters circuit
The figure as shown below is the complete set of three passive audio filters, which can be accessed or out of the circuit. These filters are designed for 500Ω impedance terminal. Three different passbands are available: 1 kHz, 3 kHz and 4 kHz. Filter of 4 kHz is a fifth-order Butterworth (Butterworth) type filter. Filter of 3 kHz is a seventh-order elliptic design followed the Niewiadomski. 1000Hz is reduced from the circuit of 3000Hz. Campbell points out that these filters’ form factor is 2.2:1 and the passband is very flat. ... The corner is smooth with no ripple or self-vibration.”