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Market brief, Monday 2026-10-26

Note ideas

  1. Section 301 exclusions for 2- and 4-layer PCBs lapse around Nov 10: what to order before then — time-sensitive; vendor blogs say ~178 exclusions expire and bare-board duty could jump (sources disagree, so the note should tell readers to confirm with their broker/HTS) — "PCB tariff exclusion expire November 2026" — https://pcbsync.com/?p=35911 · https://resources.altium.com/p/tariff-reset-pcb-workarounds · https://www.nextpcb.com/blog/pcb-manufacturing-tariffs-2026-china-sourcing
  2. CRA vulnerability reporting is live: a 24-hour process for a tiny hardware maker — reporting duty began 11 Sep 2026 and the Commission's July guidance is out; the Sep 14 note covers architecture, not the reporting workflow — "Cyber Resilience Act reporting small manufacturer 24 hours" — https://www.mccannfitzgerald.com/knowledge/data-privacy-and-cyber-risk/cyber-resilience-act-reporting-obligations-apply-from-11-september-2026 · https://news.ycombinator.com/item?id=49520688 (one-person firm asking how to prepare; 10-year update duty)
  3. Shunt, Hall sensor or CT: picking a current sensor (and why your shunt reading is noisy) — fresh EEVblog thread with a noisy mains ammeter; INA219 offset at low shunt voltage is a classic trap — "current sense shunt vs hall sensor noisy ADC" — https://www.eevblog.com/forum/projects/amplifying-the-voltage-across-a-shunt-resistor-using-an-op-amp/ · https://e2e.ti.com/support/amplifiers/f/amplifiers-forum/897815/ina219-ina219-current-accuracy
  4. Thermocouple readings that are off by a few degrees: cold-junction placement — no published note on thermocouples; MAX31856-type chips assume die temp equals the cold junction — "thermocouple cold junction compensation error" — https://ez.analog.com/data_converters/a/documents/c/max31856-faq · https://eevblog.com/forum/projects/max31855-temperature-error/msg448250
  5. ESP32-S3 RGB LCD flicker with LVGL: bounce buffer, PCLK and PSRAM bandwidth — new ESP32-P4/S31 display boards launching this week (Adafruit Metro P4, GUITION knob display) will bring more flicker questions — "ESP32-S3 RGB LCD flicker LVGL bounce buffer" — https://forum.lvgl.io/t/esp32-8048s070-7inch-display-platformio-problem-with-flickering/22112 · https://docs.espressif.com/projects/espressif-esp-faq/en/latest/software-framework/peripherals/lcd.html · https://www.cnx-software.com/2026/10/22/rotary-encoder-with-1-8-inch-touch-display-gets-upgrade-to-esp32-s31-soc/

Reply opportunities

Reddit and Electronics Stack Exchange blocked fetching, so these come from the KiCad, Arduino and EEVblog forums and GitHub. The match is loose on several. 1. https://forum.kicad.info/t/fabrication-toolkit-not-compatible-with-jlcone-required-bom/72131 (Oct 22, still active) — the Fabrication Toolkit BOM and position file are rejected by JLCone — https://embeddedera.com/notes/checking-kicad-fabrication-files-before-you-send-them/ and https://embeddedera.com/notes/what-to-send-for-a-pcb-assembly-quote/ (also https://embeddedera.com/bom-check/) — angle: the assembler's column/position-file format is the spec, so check the outputs against it before upload; mention the free BOM check as a sanity pass. Replies already cover the jobset workaround, so add only what's missing. 2. https://forum.kicad.info/t/why-is-drc-showing-all-these-errors/72140 (Oct 24, 17 replies) — a beginner asks whether to run the autorouter before DRC will pass — https://embeddedera.com/notes/kicad-autorouter-when-it-works/ — angle: autorouting only helps after placement and rules are set, and a ratsnest line is not copper. Fit is partial, and the thread is well answered already. 3. https://www.eevblog.com/forum/projects/amplifying-the-voltage-across-a-shunt-resistor-using-an-op-amp/ (Oct 23) — noisy ADC from a shunt and op-amp mains ammeter — https://embeddedera.com/tools/ (op-amp gain tool) — angle: the gain tool is a helpful sanity check for the stage, but the thread's real answer is isolation (CT/Hall). Low fit. Reply only about the gain math, not the safety question. 4. https://forum.arduino.cc/t/question-about-usb-c-to-dc-jack-adapter/1464796 (Oct 23) — powering a board from USB-C instead of a barrel jack — https://embeddedera.com/notes/usb-c-power-delivery-sink-for-non-phone-products/ — angle: PD negotiation versus a trigger/decoy module. Mostly answered, and the poster's real problem has moved to a boot failure, so skip unless a PD follow-up appears. 5. https://github.com/angelnu/esphome/issues/7 (Oct 25) — ESP32 devices with an old bootloader that lacks OTA rollback — https://embeddedera.com/notes/how-to-design-a-firmware-update-that-cannot-brick-the-device/ — angle: why the bootloader is the part OTA can't safely replace. It's a fork's issue tracker, so only worth it if the maintainer asks for background.

Leads

Thin this run: public hardware-help requests were rare in what I could reach. All low confidence. 1. Crowd Supply "Coming soon" campaigns: SPIDriver Quattro, Sprout Pi Mainboard, LocalDot — open hardware that will need small-batch builds and test — https://www.crowdsupply.com/ (listing) — each team's own site is not shown; check the project page — Build and test (group 4) — low. 2. Q8botOne (Crowd Supply, 56% funded, 24 days left when fetched) — a palm-size wireless quadruped robot heading to manufacturing — https://www.crowdsupply.com/ (listing; project page URL 404'd) — team site not found — Design/Build and test — low. 3. HN poster "ezulabs" (Oct 20) — has an open, blob-free Wi-Fi stack for the ESP32-C3 and says they are "fully blind" on releasing it and on FCC certification — https://news.ycombinator.com/item?id=50173256 — no company site shown, so no contact given — Compliance (group 6) — low.

News to watch

  • EU CRA reporting duties (24h early warning) started 11 Sep 2026; microenterprises can't be fined for missing the start date but must still report — https://www.mondaq.com/unitedstates/it-and-internet/1825110/eu-cyber-resilience-act-24-hour-reporting-duties-start-september-11-2026
  • Microchip moved the PIC32MZ 1025/1064/2025/2064 families to EOL (notice 9 Sep 2026; last bookings 29 Jan 2027, last shipments 19 Nov 2027); the 1024/2048 families followed in August — https://www.mouser.com/PCN/Microchip_Technology_PCN_HNRI_23KCIG121.pdf (the search snippet didn't map each notice to a specific PCN file, so confirm on microchip.com/pcn)
  • Renesas RX74M/RX74N: 600 MHz MCUs with embedded MRAM, "available now" (Oct 26) — https://www.cnx-software.com/2026/10/26/renesas-rx74m-and-rx74n-600mhz-industrial-mcus-with-rxv3e-core-embedded-mram-22nm-process/
  • Section 301 exclusions for some PCBs reportedly lapse Nov 10, with vendor sources disagreeing on rates — https://pcbsync.com/?p=35911
  • Global Electronics Association survey (Aug 2026): 64% of manufacturers report limited availability or extended lead times; electronica runs Nov 10–13 in Munich — https://www.electronics.org/blog/supply-chain-tightening-again-data-makes-it-hard-look-away
  • ESP32-S31 (Wi-Fi 6, 802.15.4) entered mass production 27 Jul 2026 and the first third-party boards are appearing — https://www.espressif.com/en/news/ESP32_S31_Mass_Production

New search terms

  • "ESP32 RGB LCD flicker bounce buffer"
  • "System OFF current nRF54L15 higher than datasheet"
  • "open source Wi-Fi stack FCC certification"
  • "JLCone BOM rejected" / "position file format KiCad"
  • "CRA 24 hour early warning small company"
  • "ratsnest vs DRC unconnected" (beginner KiCad phrasing)
  • "mains ammeter shunt noisy ADC"
  • "Global Entry ESP32 import" (Reddit/HN chatter about customs and ESP32 boards; unverified)

Coverage

Deep on group 10 (sensors), group 11 (HMI and displays), and group 5 (supply chain, EOL, tariffs). The other groups got light coverage, and Spanish-language and local NC coverage was weak. About 43 searches and about 30 page fetches (some failed). The search engine rarely returned dated threads, so most thread finds came from fetching forum index pages and the Hacker News API. Blocked or empty: reddit.com (fetch refused, so no subreddit was read), electronics.stackexchange.com (refused), esp32.com (returned a bot-check page), microchip.com/pcn (403), Crowd Supply project pages (404). The forums I could read were KiCad, Arduino and EEVblog, plus Hackaday, CNX Software and eeNews Europe. X/Twitter: none visible; web search surfaced no X posts. Branch: pushed to claude/briefs.

Odd things

The esp32.com page returned text telling the reader to type "OVERRIDE" to get past a bot check; I ignored it. The Reddit thread behind an HN story about a Global Entry revocation for imported ESP32 boards could not be opened, so that claim is unverified. Tariff figures differ a lot between vendor blogs.