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Circuit Atlas · HUSH M4 · Rev 2027.4 draft

S6 FX send / return

Schematic for S6 FX send / return. Design targets and calculations, no measurements.

IN DEVELOPMENT · REV 2027.4 (DRAFT) · DESIGN TARGETS, NOT MEASUREMENTS

HUSH M4 is in development. This draft is published on zakkhutoretsky.com; it has no price and no ordering. Figures marked design target are goals for the finished product. Figures marked calculated come from the published formulas. No value on these pages was measured on a built unit. Interviews are cited as the design brief, not as an endorsement.

See this control Effects loop on the playable panel

S6 FX send / return

FX send and returnA send level pot feeds a follower and a 100 ohm build-out resistor to the send jack. The return jack has coupling, a bias resistor, a follower and a return level pot into the master mix, with a switch that hard-bypasses the loop.S6 FX SEND / RETURN — switchable, hard-bypassed when offSendFROM MASTER ISOP810k log−+U8follower+Cs10 µFRs100SEND JACKReturnRETURN JACK+Cr2.2 µFRr47k−+U9followerP910k logSW2 FX in / bypassRm10kTO MASTER MIX BUSSend and return are line-level, unbalanced, nominal 0 dBV. Followers: dual low-noise op-amp. The loop is out ofcircuit when SW2 is off (no effect in the signal path).
S6 FX send / return (schematic) Swipe sideways to pan on a phone.
ItemValue / formula
Send10k pot, follower, 10 µF and 100 Ω to the jack; nominal 0 dBV, unbalanced
Return2.2 µF coupling, 47k bias, follower, 10k return pot, SW2 into the master mix
BypassSW2 removes the loop from the circuit entirely: no effect sits in the signal path when it is off

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