Circuit Atlas · HUSH M4 · Rev 2027.4 draft

References

Formulas and datasheet figures cited on the schematics.

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.

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References

Formulas and datasheet figures are cited by number in the tables. Standards are listed by title; the IEC pages are catalogue entries, the standards themselves are paid documents and were not read in full.

  • [R1] RIAA equalization: time constants 3180, 318 and 75 µs (IEC 60098 / RIAA) — Wikipedia, RIAA equalization
  • [R2] S. P. Lipshitz, “On RIAA Equalization Networks”, Journal of the Audio Engineering Society 27(6), pp. 458–481, June 1979 — AES E-Library record
  • [R3] J. Karki, “Analysis of the Sallen-Key Architecture”, Texas Instruments application report SLOA024B — TI SLOA024B
  • [R4] S. Linkwitz, “Active Filters”: LR2 and LR4 crossovers as cascaded Sallen-Key sections, Q0 = 0.71 per LR4 stage — Linkwitz Lab, Active Filters
  • [R5] Texas Instruments, LM317 3-Pin Adjustable Regulator datasheet (Rev. Z): Vₒ = 1.25 V × (1 + R2/R1) + Iₐdⱼ·R2 — TI LM317 datasheet
  • [R6] Texas Instruments, NE5532 dual low-noise operational amplifier datasheet (5 nV/√Hz typical at 1 kHz) — TI NE5532 datasheet
  • [R7] Texas Instruments, NE5534 low-noise operational amplifier datasheet (3.5 nV/√Hz typical at 1 kHz) — TI NE5534 datasheet
  • [R8] THAT Corporation, 2180 series voltage-controlled amplifier datasheet (control constant 6.1 mV/dB) — THAT Corporation datasheets
  • [R9] IEC 60268-3:2018, Sound system equipment — Part 3: Amplifiers (specification and measurement methods) — IEC webstore
  • [R10] IEC 62368-1:2023, Audio/video, information and communication technology equipment — Part 1: Safety requirements — IEC webstore
  • [R11] W3C, Web Audio API (the browser demonstration on /mixer uses it; it is not the analogue design) — W3C Web Audio API
  • [R14] ESS Technology, ES9842PRO 4-channel ADC datasheet v0.5.1 (dynamic range, THD+N, 32-bit PCM / TDM words) — ES9842PRO datasheet
  • [R15] ESS Technology, ES9843PRO 4-channel ADC datasheet v0.4.1 (alternative part) — ES9843PRO datasheet
  • [R16] XMOS, XK-AUDIO-316-MC USB audio multichannel reference: USB Audio Class 2.0, asynchronous, XU316 — XMOS sw_usb_audio, app_316_mc
  • [R17] T. Stilson and J. Smith, “Analyzing the Moog VCF with Considerations for Digital Implementation”, ICMC 1996 — CCRMA, Stilson and Smith
  • [R18] A. Huovilainen, “Non-linear digital implementation of the Moog ladder filter”, DAFx-04 — DAFx-04 paper archive
  • [R20] J. Dattorro, “Effect Design, Part 1: Reverberator and Other Filters”, Journal of the Audio Engineering Society 45(9), pp. 660–684, September 1997 (plate topology, delay lengths and output taps, Fig. 1 and Table 2) — CCRMA, Dattorro
  • [R21] Princeton Technology Corp., PT2399 Echo Processor IC datasheet V1.9, March 2022 (44 kbit RAM, VCO delay set by an external resistor, THD 0.5 % typ, SNR better than 90 dB typ, +5 V application circuits) — PT2399 datasheet
  • [R22] Panasonic MN3207, 1024-stage low-voltage low-noise BBD datasheet (delay 2.56 to 51.2 ms for a 200 to 10 kHz clock, supply +4 to +10 V, THD 0.4 % typ, S/N 73 dB typ). Read from a copy hosted by Synthrotek. — MN3207 datasheet (hosted copy)
  • [R23] R. Elliott (ESP), “Equalisers, The Various Types And How They Work”, Elliott Sound Products, March 2015, updated February 2021 (Baxandall and James tone controls; boost / cut stages with a band-pass filter between virtual-earth op-amp inputs; multiple-feedback, twin-T and state-variable band-pass options; gyrators) — ESP, Equalisers
  • [R19] V. Zavalishin, The Art of VA Filter Design, Native Instruments. Cited by title and author; no link was checked for this draft.
  • [R12] D. Self, Small Signal Audio Design, 3rd edition, Focal Press / Routledge (2020). Book, no link.
  • [R13] P. Horowitz and W. Hill, The Art of Electronics, 3rd edition, Cambridge University Press (2015). Book, no link.

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