Нископропускащи филтъри
| Butterworth | Bessel | Linkwitz |
| 6 db / oct | ||
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| C = 1 / (2*π*fo*R) | ||
| 12 db / oct | ||
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Ca = 1,414 / (2*π*fo*R) Cb = 0,7071 / (2*π*fo*R) |
Ca = 0,9076 / (2*π*fo*R) Cb = 0,6809 / (2*π*fo*R) |
Ca = 1 / (2*π*fo*R) Cb = Ca |
| 18 db / oct | ||
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|
Ca = 1,392 / (2*π*fo*R) Cb = 3,546 / (2*π*fo*R) Cc = 0,2024 / (2*π*fo*R) |
Ca = 0,9548 / (2*π*fo*R) Cb = 0,4998 / (2*π*fo*R) Cc = 0,7560 / (2*π*fo*R) |
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| 24 db / oct | ||
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|
Ca = 1,0824 / (2*π*fo*R) Cb = 0,9239 / (2*π*fo*R) Cc = 2,6130 / (2*π*fo*R) Cd = 0,3827 / (2*π*fo*R) |
Ca = 0,7298 / (2*π*fo*R) Cb= 0,6699 / (2*π*fo*R) Cc = 1,0046 / (2*π*fo*R) Cd = 0,3872 / (2*π*fo*R) |
Ca = 1,414 / (2*π*fo*R) Cb = 0,7071 / (2*π*fo*R) Cc = Ca Cd = Cb |
R [Ω], C[F], f[Hz], R =
4,7kΩ .. 10kΩ
| Butterworth | Bessel | Linkwitz |
| 6 db / oct | ||
 |
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| R = 1 / (2*π*fo*C) | ||
| 12 db / oct | ||
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Ra = 0,7071 / (2*π*fo*C) R b= 1,414 / (2*π*fo*C) |
Ra = 1,1017 / (2*π*fo*C) Rb = 1,4688 / (2*π*fo*C) |
Ra = 1 / (2*π*fo*C) Rb = Ra |
| 18 db / oct | ||
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||
|
Ra = 0,7184 / (2*π*fo*C) Rb = 0,2820 / (2*π*fo*C) Rc = 4,9407 / (2*π*fo*C) |
Ra = 1,0474 / (2*π*fo*C) Rb = 2,0008 / (2*π*fo*C) Rc = 1,3228 / (2*π*fo*C) |
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| 24 db / oct | ||
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Ra = 0,9239 / (2*π*fo*C) Rb = 1,0824 / (2*π*fo*C) Rc = 0,3827 / (2*π*fo*C) Rd = 2,6130 / (2*π*fo*C) |
Ra = 1,3701 / (2*π*fo*C) Rb = 1,4929 / (2*π*fo*C) Rc = 0,9952 / (2*π*fo*C) Rd = 2,5830 / (2*π*fo*C) |
Ra = 0,7071 / (2*π*fo*C) Rb = 1,414 / (2*π*fo*C) Rc = Ra Rd = Rb |
R [Ω], C[F], f[Hz], C = 4,7nF .. 10nF
Калкулатор за пресмятане на активни филтри в Excel: oamp_filters.zip