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@ericfont
Created December 10, 2025 08:00
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try sallen key lowpass
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stroke-dasharray=""/><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="12px" font-style="normal" font-weight="normal" text-decoration="normal" x="320" y="138" text-anchor="start" dominant-baseline="alphabetic"></text><path fill="none" stroke="#788678" paint-order="fill stroke markers" d=" M 432 144 L 448 144" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="12px" font-style="normal" font-weight="normal" text-decoration="normal" x="440" y="138" text-anchor="start" dominant-baseline="alphabetic"></text><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 432 176 L 432 192" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 442 192 L 422 192" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path 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@ericfont
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sim with 30kHz cutoff

it looks extremely good:

image

@ericfont
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try two sallen-key at 200kHz cutoff

circuit-20251210-0316

not good

image

Were much butter off with just one at 30kHz cutoff.

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