(b).
| Low pass filter (active + RC) | |||||||
|---|---|---|---|---|---|---|---|
| R8 | R9 | R10 | R11 | R12 | C5 | C6 | C7 |
| 3.16 k | 14.7 k | 10 k | 24.9 k | 143 | 4.7 n | 4.7 n | 220 n |
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