The scenario
Designing a maximally flat two-pole low-pass filter for audio or sensor signal conditioning.
What is in this drawing
Read the decisions behind it.
01
Use equal source and load termination (1kΩ) for Butterworth response
02
Choose L=22.5mH and C=22.5nF for 10 kHz cutoff
When a simple, passive second-order low-pass filter is acceptable and no gain is required.
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