[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-an-llm-that-designs-circuit-boards-without-unit-tests":10,"sections":34},{"siteName":4,"siteTagline":5,"publisherName":4,"contactEmail":6},"The Revision","Tech news, decoded.","editor@therevision.news",{"gaMeasurementId":8,"adsenseClientId":9},"G-ZW2MV82GYR","ca-pub-8533917693782264",{"article":11},{"id":12,"slug":13,"title":14,"dek":15,"body_md":16,"tags_json":17,"published_at":18,"created_at":19,"updated_at":20,"status":21,"review_note":22,"review_notes":23,"image_url":22,"persona_id":22,"persona_name":22,"section":24,"tags":25,"sources":29,"feedback":33,"feedback_at":22,"cost_usd":33,"total_tokens":33},1778,"an-llm-that-designs-circuit-boards-without-unit-tests","An LLM That Designs Circuit Boards Without Unit Tests","PCBSchemaGen uses a structured verifier and bandit search to let a frozen 31B model pass 81% of PCB schematic tasks with no golden references.","A new inference-time framework lets a frozen large language model generate and repair printed circuit board schematics without any hand-labeled test oracles.\n\nResearchers introduced PCBSchemaGen, a training-free system that wraps an off-the-shelf LLM with three components: a domain schema derived from IC datasheets, a deterministic five-layer verifier that scores candidates and pinpoints pin-level errors, and a Thompson Sampling bandit that selects which candidate to refine next. The key constraint the team worked around is that PCB schematic design has no unit-test equivalent — correctness depends on physical constraints tied to real component packages, not a function that returns pass or fail. Tested across 227 tasks spanning 22 circuit domains, the open-weight Gemma-4-31B model passed 81.3% of PCBBench tasks under the framework. A prompting-only baseline on the same model collapsed on complex system-level designs.\n\nThe result matters because it sketches a path for applying LLMs to engineering domains where ground-truth oracles simply do not exist. Most code-synthesis benchmarks are built around unit tests; PCB design, like many physical-world engineering tasks, is not, and that gap has kept LLM tooling on the sidelines.\n\nThe framework and benchmarks are open-sourced, which at least makes the claims checkable — though translating an 81% pass rate on benchmark tasks into a tool a hardware engineer would trust in production is a longer road than the paper covers.","[\"ai\",\"hardware\",\"dev-tools\",\"research\"]","2026-06-19T04:00:00.000Z","2026-06-19T11:42:53.161Z","2026-06-19T14:22:19.088Z","published",null,[],"ai",[24,26,27,28],"hardware","dev-tools","research",[30],{"name":31,"url":32},"arXiv cs.AI","https:\u002F\u002Farxiv.org\u002Fabs\u002F2602.00510",0,{"sections":35},[36,40,44,49,54,58,63,67,70,75,80,85,90,95],{"name":37,"slug":24,"count":38,"latest_published_at":39},"AI",491,"2026-06-19T14:59:11.000Z",{"name":41,"slug":42,"count":43,"latest_published_at":18},"Security","security",132,{"name":45,"slug":46,"count":47,"latest_published_at":48},"Policy","policy",88,"2026-06-16T09:26:09.000Z",{"name":50,"slug":51,"count":52,"latest_published_at":53},"Consumer Tech","consumer-tech",78,"2026-06-16T17:58:24.000Z",{"name":55,"slug":26,"count":56,"latest_published_at":57},"Hardware",62,"2026-06-18T15:24:16.000Z",{"name":59,"slug":60,"count":61,"latest_published_at":62},"Deals","deals",58,"2026-06-19T14:43:50.000Z",{"name":64,"slug":65,"count":61,"latest_published_at":66},"Software","software","2026-06-16T20:00:00.000Z",{"name":68,"slug":27,"count":69,"latest_published_at":18},"Dev Tools",50,{"name":71,"slug":72,"count":73,"latest_published_at":74},"Science","science",38,"2026-06-18T04:00:00.000Z",{"name":76,"slug":77,"count":78,"latest_published_at":79},"Gaming","gaming",31,"2026-06-16T15:25:13.000Z",{"name":81,"slug":82,"count":83,"latest_published_at":84},"General","general",26,"2026-06-13T18:35:15.000Z",{"name":86,"slug":87,"count":88,"latest_published_at":89},"Startups","startups",23,"2026-06-16T15:00:00.000Z",{"name":91,"slug":92,"count":93,"latest_published_at":94},"Reviews","reviews",19,"2026-06-14T08:00:00.000Z",{"name":96,"slug":97,"count":98,"latest_published_at":99},"How-To","how-to",6,"2026-06-16T09:00:00.000Z"]