From e1991b5f23d063eaa7bd69d9c9f56ef48957adcb Mon Sep 17 00:00:00 2001 From: cah Date: Mon, 30 Mar 2026 22:11:31 -0600 Subject: [PATCH] docs: fix low-severity BOM price discrepancies - USB-C connector: $0.60 -> $1.20 (actual Digi-Key pricing) - Reset button: $0.15 -> $0.30 (actual Digi-Key pricing) - SiPM MicroFC-60035: $30 -> $23 (actual Digi-Key pricing) - Updated all derived totals: Part B ~$52, RX board $75-95, full demo $140-190, cost summary table Co-Authored-By: Claude Opus 4.6 (1M context) --- README.md | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/README.md b/README.md index 38fc58e..ffc69b4 100644 --- a/README.md +++ b/README.md @@ -150,10 +150,10 @@ A minimal breakout board for silicon bring-up and firmware demo, designed for im | 1.8V LDO regulator (1A) | AMS1117-1.8 | 1 | $0.25 | | USB-UART bridge | CH340C | 1 | $0.50 | | SPI flash (32 Mbit) | W25Q32JVSSIQ | 1 | $0.65 | -| USB-C connector | USB4110-GF-A | 1 | $0.60 | +| USB-C connector | USB4110-GF-A | 1 | $1.20 | | Decoupling caps (100nF) | CL05B104KO5NNNC | 12 | $0.60 | | Bulk caps (10uF) | CL10A106KP8NNNC | 4 | $0.40 | -| Reset button | PTS645SM43SMTR92 | 1 | $0.15 | +| Reset button | PTS645SM43SMTR92 | 1 | $0.30 | | LEDs + resistors | -- | 5 | $0.50 | | PCB fabrication (qty 5) | JLCPCB 2-layer FR4 | 1 | $2.00 | | **Total (excl. Caravel chip)** | | | **~$8** | @@ -196,14 +196,14 @@ A reference design for the optical receiver frontend, sharing the same PCB as Pa | Component | Part | Qty | Est. Cost | |-----------|------|-----|-----------| -| SiPM detector (demo) | MicroFC-60035-SMT | 1 | $30 | +| SiPM detector (demo) | MicroFC-60035-SMT | 1 | $23 | | Transimpedance amplifier | AD8015ARZ | 1 | $8 | | Fast comparator | ADCMP607BCPZ | 1 | $6 | | Companion MCU | RP2040 | 1 | $1 | | SiPM bias supply (30V boost) | LT3482 + passives | 1 | $8 | | SMA connector (ext. clock) | SMA-J-P-H-ST-EM1 | 1 | $1 | | Passives + connectors | -- | ~20 | $5 | -| **Part B additional total** | | | **~$59** | +| **Part B additional total** | | | **~$52** | ### Full Bench Demo System @@ -212,10 +212,10 @@ A complete bench-scale free-space optical link for end-to-end demonstration: | Component | Description | Est. Cost | |-----------|-------------|-----------| | TX board | Modulated laser diode (650 nm) + driver + collimating optics | $40-60 | -| RX board | Part A + Part B assembled | $80-120 | +| RX board | Part A + Part B assembled | $75-95 | | Optics | Aspheric collimating lens, detector alignment rail | $20-30 | | Enclosure | 3D-printed (OpenSCAD parametric), standoffs, cutouts | $5 | -| **Complete demo system** | | **$150-250** | +| **Complete demo system** | | **$140-190** | Link parameters: 1-5 m free-space path, 0.5-5 photons/slot at receiver, 650 nm wavelength. TX power < 0.39 mW (IEC 60825-1 Class 1, eye-safe under all viewing conditions). @@ -260,8 +260,8 @@ The electrical interface is identical to Part B: the detector's analog output fe |------|-----------|--------| | chipIgnite shuttle | Contest-covered | GDSII submitted | | Part A breakout board (assembled qty 5) | $25-40 | KiCad design complete, fab-ready on silicon return | -| Part B optical frontend (additional) | ~$59 | Schematic complete, components specified (DNP) | -| Full demo system (TX + RX + optics) | $150-250 | Documented, post-silicon integration | +| Part B optical frontend (additional) | ~$52 | Schematic complete, components specified (DNP) | +| Full demo system (TX + RX + optics) | $140-190 | Documented, post-silicon integration | | Advanced frontend (GMAPD or DAPD) | $5K-15K | Integration path documented, no ASIC changes needed | | **Minimum viable demo** | **$25-40** | **Buildable immediately on silicon return** |