metronome

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Author	SHA1	Message	Date
Me Here	3f7f4b94d9	PM_K-1 hardware: Stage 1 input receiver as SKiDL (code-defined schematic) Capture method = SKiDL per decision. circuits/stage1_input.py defines the balanced line receiver + per-leg protection (DC-block film cap, series R, bias R, clamp diodes to the rails) and emits a KiCad netlist. ERC: 0 errors (2 expected warnings -- AIN_HOT/COLD reach only one pin until the interconnect block exists). Container: env vars point SKiDL/KiCad at the symbol/footprint libs. VERIFY-before-layout flagged in-file: exact THAT124x gain suffix, its SO-8 pin numbers, clamp-diode orientation. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-05-30 19:43:07 -05:00
Me Here	bcfa5dd7f0	PM_K-1 hardware: reproducible EDA container (KiCad 9 + ngspice) Pinned toolchain under hardware/eda/ so the design can be checked/simulated identically in the future (system KiCad is 7.0, which has no CLI ERC): - Containerfile: Ubuntu 24.04 + KiCad 9 (PPA) + ngspice + python3. - run.sh: build-if-needed + run with the repo mounted; lands in hardware/kicad. - sim/input_loading.cir: ngspice deck proving the line(25k) vs instrument(1M) input-loading decision — Hi-Z preserves a +16dB pickup resonance the 25k load flattens to -3dB. Verified: KiCad 9.0.9, ngspice-42, ERC runs clean (0 violations) on pm_k1_core.kicad_sch. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-05-30 19:17:54 -05:00
Me Here	87caa933ea	PM_K-1 hardware: core-board design-of-record + KiCad scaffold Heirloom pro-audio modular brain/face design captured under hardware/: - DESIGN.md: full spec (RP2350, ±15V studio rails via TPS65131+TPS7A LDOs, PCM5102A click, THAT1240/1646 balanced click-injector with switchable protected line/instrument input, fail-safe mute relay, series ground-lift, USB-MIDI default + DNP hardware MIDI, sig/clip detect, ESD/EMI, chassis), plus the two-interconnect pinouts (Pico-compatible digital ribbon + separate analog/MIDI). - BOM.csv: manufacturer part numbers + rough costs. - kicad/: valid KiCad 7 project + documented schematic canvas. PCB layout/routing remains the interactive step. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-05-30 11:42:45 -05:00

Author

SHA1

Message

Date

Me Here

3f7f4b94d9

PM_K-1 hardware: Stage 1 input receiver as SKiDL (code-defined schematic)

Capture method = SKiDL per decision. circuits/stage1_input.py defines the
balanced line receiver + per-leg protection (DC-block film cap, series R, bias R,
clamp diodes to the rails) and emits a KiCad netlist. ERC: 0 errors (2 expected
warnings -- AIN_HOT/COLD reach only one pin until the interconnect block exists).

Container: env vars point SKiDL/KiCad at the symbol/footprint libs.

VERIFY-before-layout flagged in-file: exact THAT124x gain suffix, its SO-8 pin
numbers, clamp-diode orientation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-05-30 19:43:07 -05:00

Me Here

bcfa5dd7f0

PM_K-1 hardware: reproducible EDA container (KiCad 9 + ngspice)

Pinned toolchain under hardware/eda/ so the design can be checked/simulated
identically in the future (system KiCad is 7.0, which has no CLI ERC):
- Containerfile: Ubuntu 24.04 + KiCad 9 (PPA) + ngspice + python3.
- run.sh: build-if-needed + run with the repo mounted; lands in hardware/kicad.
- sim/input_loading.cir: ngspice deck proving the line(25k) vs instrument(1M)
  input-loading decision — Hi-Z preserves a +16dB pickup resonance the 25k load
  flattens to -3dB.

Verified: KiCad 9.0.9, ngspice-42, ERC runs clean (0 violations) on
pm_k1_core.kicad_sch.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-05-30 19:17:54 -05:00

Me Here

87caa933ea

PM_K-1 hardware: core-board design-of-record + KiCad scaffold

Heirloom pro-audio modular brain/face design captured under hardware/:
- DESIGN.md: full spec (RP2350, ±15V studio rails via TPS65131+TPS7A LDOs,
  PCM5102A click, THAT1240/1646 balanced click-injector with switchable
  protected line/instrument input, fail-safe mute relay, series ground-lift,
  USB-MIDI default + DNP hardware MIDI, sig/clip detect, ESD/EMI, chassis),
  plus the two-interconnect pinouts (Pico-compatible digital ribbon + separate
  analog/MIDI).
- BOM.csv: manufacturer part numbers + rough costs.
- kicad/: valid KiCad 7 project + documented schematic canvas. PCB
  layout/routing remains the interactive step.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-05-30 11:42:45 -05:00

3 commits