# Active crossover notes

- OPA2134 datasheet: https://www.ti.com/lit/ds/symlink/opa2134.pdf
- For exact Butterworth ratios, prefer R2 = 2·R1 and C2 = 2·C1 even if that means series/parallel combinations instead of a single E24 part.
- 7915 pinout is **not** the same as 7815 — double-check before wiring.