Circuit Atlas · HUSH M4 · Rev 2027.4 draft
S7 Master, booth and cue
Schematic for S7 Master, booth and cue. 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 Master isolator, master and booth on the playable panel
S7 Master, booth and cue
| Item | Value / formula |
|---|---|
| Sum | Inverting summer: gain per input = −Rf/Rin = −10k/10k = −1 |
| Output | Impedance-balanced driver: follower plus unity inverter, 47.5 Ω in each leg, Rout = 2 × 47.5 = 95 Ω |
| Level | +28 dBu = 19.46 Vrms balanced, 13.76 V peak per leg. On ±18 V rails with 16.5 V usable swing per leg the balanced limit is about +29.6 dBu (1.6 dB above the +28 dBu design target). On ±15 V rails (13.5 V swing) it would be only +27.8 dBu: this is why the design uses ±18 V |
| Cue | Channel pre-fader taps into an inverting sum, then a cue / master blend pot into the headphone stage |