Circuit Atlas · HUSH M4 · Rev 2027.4 draft
S3b Three-band isolator (master section)
Schematic for S3b Three-band isolator (master section). 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 on the playable panel
S3b Three-band isolator (master section)
| Item | Value / formula |
|---|---|
| Split | LP4 at 300 Hz, HP4 at 300 Hz then LP4 at 3 kHz, HP4 at 3 kHzR4 |
| Band gain | ×2 band amp and a 10k linear pot: minimum = full kill, centre = unity (the pot divides by 2), maximum = +6 dB |
| Sum | Inverting sum, 10k per band. This is the master isolator. The channel EQ (S13) reuses the same split with the low crossover at 180 Hz and a fixed middle leg |
| Open task | Allpass delay trim between the three paths so the bands recombine flat in phase; to be done on a prototype |