project
12 V to 5 V / 1 A Buck Molecule (TPS54202)
Public Unreviewedby John Lauer
An independently designed 12 V to 5 V, 1 A synchronous buck molecule (TI TPS54202), with calculations, ngspice and PSpice simulation, KiCad 10 schematic and board, and the board laid out and analysed with adom-aiflow.
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docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/README.mddeleted−207@@ -1,207 +0,0 @@-# AI Flow run: claude-opus-5.5 on board-0--**Delivered** at 2026-09-30T11:33:25Z: **542.0 min of AI time** from the prompt to "done, here is your video" (624.7 min on the wall clock). Since then 0.3 min more of AI time over 1 follow-up prompt(s), listed under Sessions; none of it is in the delivery number.--Prompt at 2026-09-30T01:08:44Z (UTC). Flow: board. Every number here is from the run's append-only ledger (run.jsonl). AI time is the time the AI was working on a prompt: from the human's prompt to the AI's done, with any gap over 15 min where no command ran (unobserved, not proven idle) cut out.--## The video--**The final cut of this run, 25 s: only the moments something moved, every step in order, the AI's analysis drawings fullscreen, the run and step clocks in the corner, the words cut to the picture.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/final-1790767991.mp4" type="video/mp4"></video>--## Sessions--One row per human prompt: the AI's time on it, unobserved gaps excluded by the heuristic, which may include external AI work.--| Session | Prompt at | Done at | AI time min | Unobserved gap min | What |-|---|---|---|---|---|---|-| 1 | 2026-09-30T01:08:44Z | 2026-09-30T11:33:26Z | 542.0 | 83 | the first prompt |-| 2 | 2026-09-30T11:33:26Z | (open) | 0.2 | 0 | follow-up (no prompt mark; say `prompt --text` next time) |-| **all** | | | **542.3** | | |--## Per step--AI time only, the idle cut out.--| Step | AI min | AI thinking min | Tool min | Turns | Visits | Returns | Longest think |-|---|---|---|---|---|---|---|---|-| intake | 25.3 | 25.3 | 0.0 | 2 | 0 | 0 | 25.0 min |-| routing | 3.6 | 2.1 | 1.5 | 6 | 1 | 0 | 1.3 min |-| pours | 9.8 | 0.9 | 8.9 | 6 | 1 | 0 | 0.8 min |-| current | 7.2 | 0.6 | 6.5 | 8 | 1 | 0 | 0.4 min |-| thermal | 439.2 | 20.3 | 418.9 | 130 | 1 | 0 | 19.0 min |-| 3d | 2.0 | 0.0 | 2.0 | 7 | 1 | 0 | 0.0 min |-| silkscreen | 55.2 | 0.0 | 55.2 | 26 | 1 | 0 | 0.0 min |-| **total** | **542.3** | **49.2** | **493.1** | | | | |--## Decisions along the way--- 2026-09-30T01:34:04Z clip-start:routing-1-- 2026-09-30T01:45:25Z clip-start:pours-1-- 2026-09-30T01:52:33Z clip-start:current-1-- 2026-09-30T01:59:29Z clip-start:thermal-1-- 2026-09-30T02:19:53Z clip guard: the thermal clip ran 20 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-30T02:32:24Z clip guard: the thermal clip ran 32 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-30T02:37:35Z clip guard: the thermal clip ran 38 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-30T03:18:04Z clip-start:silkscreen-1-- 2026-09-30T03:18:53Z capture-stop-- 2026-09-30T03:30:45Z capture-start-- 2026-09-30T03:52:18Z clip guard: the clip ran 21 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-30T04:19:11Z capture-stop-- 2026-09-30T10:15:26Z recut: 5 clips re-cut (10x and action) with this binary's rules--## Where the board stands--- routing: 0 unrouted after null passes-- gate: 0 new DRC errors, 0 unconnected, null inherited-- landed live: 0 of 0 route entries-- pours: 1 groups, failed []-- copper kept (mm2 per layer): {"B.Cu":498.82,"F.Cu":434.89}-- analyze-current: pass-- analyze-thermal: pass--## The steps on camera--One clip per step visit, sped up 10x, with the editor at the start and the end of the visit. A caption above every clip and screenshot says what it shows.--### routing--What this step does: route to 100 percent with the spec's rules, gate with KiCad's DRC, land as undo steps; the AI takes it with take route=ai--Why the AI came back here: the planeUnder gate: EN via and track plus the VOUT sense on B.Cu under the input hot loop--**Clip: routing, the PCB editor from 2026-09-30T01:34:04Z to 2026-09-30T01:44:02Z. Motion only: 3.6 min of real time, 4 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/routing-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the routing clip, what the camera saw.**----**Screenshot: the board when routing began.**----**Screenshot: the board when routing ended.**----### pours--What this step does: pour every net the spec names, keepouts along Kelvin taps, thermal and stitching vias, land, measure the copper kept--**Clip: pours, the PCB editor from 2026-09-30T01:45:25Z to 2026-09-30T01:51:31Z. Motion only: 2.1 min of real time, 2 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/pours-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the pours clip, what the camera saw.**----**Screenshot: the board when pours began.**----**Screenshot: the board when pours ended.**----### current--What this step does: IPC-2221 on every loaded net, pour and via capacity, the same-layer rule; then the AI's own current density drawing and a walkthrough of the pours it judged--**Clip: current, the PCB editor from 2026-09-30T01:52:33Z to 2026-09-30T01:58:31Z. Motion only: 2.2 min of real time, 3 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/current-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the current clip, what the camera saw.**----**Screenshot: the board when current began.**----**Screenshot: the board when current ended.**----### thermal--What this step does: copper and vias at every hot tab against the rise budget; then the AI's own temperature rise drawing and a walkthrough of the pours it judged--**Clip: thermal, still recording (started 2026-09-30T01:59:29Z); it appears here when the step ends.**--**Screenshot: the board when thermal began.**----### silkscreen--What this step does: Make both faces useful in real service: references and values, verified connector and machine-contact pinouts, polarity, board identity and bring-up labels; review native plots and assembled visibility. Offer the optional shared silkscreen dashboard: real solver events, candidate reasons, live/replay separation, fitted-model inspection and separately recorded detailed/5s replays. Audit every fitted body and every via/hole across the whole board, both faces, with coverage counts. Missing Fab geometry is not free space; native DRC does not establish fitted visibility. Keep unresolved labels explicit and do not apply an incomplete layout. Native geometry/edit/undo/refresh belongs to the EDA bridge.--**Clip: silkscreen, the PCB editor from 2026-09-30T03:18:04Z to 2026-09-30T03:18:53Z. Motion only: 16.3 min of real time, 6 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/silkscreen-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the silkscreen clip, what the camera saw.**----**Screenshot: the board when silkscreen began.**----### silkscreen--What this step does: Make both faces useful in real service: references and values, verified connector and machine-contact pinouts, polarity, board identity and bring-up labels; review native plots and assembled visibility. Offer the optional shared silkscreen dashboard: real solver events, candidate reasons, live/replay separation, fitted-model inspection and separately recorded detailed/5s replays. Audit every fitted body and every via/hole across the whole board, both faces, with coverage counts. Missing Fab geometry is not free space; native DRC does not establish fitted visibility. Keep unresolved labels explicit and do not apply an incomplete layout. Native geometry/edit/undo/refresh belongs to the EDA bridge.--**Clip: silkscreen, the PCB editor from 2026-09-30T03:30:45Z to 2026-09-30T04:24:06Z. Motion only: 16.3 min of real time, 6 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/silkscreen-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the silkscreen clip, what the camera saw.**----**Screenshot: the board when silkscreen began.**----### 3d--What this step does: the 3D walkthrough: the viewer opened from the editor, then fit, top, tilt, orbit, zoom in, swing, front, bottom, flip, top, fit, all by menu command, no mouse--**Clip: 3d, the PCB editor from 2026-09-30T10:48:38Z to 2026-09-30T10:49:20Z. Motion only: 0.4 min of real time, 9 s of it had something moving; the clock in the corner is the real elapsed time.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260930-0108/3d-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the 3d clip, what the camera saw.**----## Delivered--What the AI said when it delivered (the video is at the top of this page):--> Rework of the 12 V to 5 V buck molecule: EN and the VOUT sense moved off B.Cu under the input hot loop (planeUnder gate clear), pours landed again, current and thermal analyses passed, and the full two-sided silkscreen placed live in KiCad, one label group at a time. Gate 0 new DRC errors, netlist 58/58, molecule, sourcing and IC-etch checks pass. The 3D walkthrough was filmed before U1's laser-etched model was swapped in; the published renders show it.--## Plan usage, the second cost line--Percent of each plan limit used, as the provider reports it, at the start of the run and at its end.--| Provider | Limit | At start | At end | Used by this run |-|---|---|---|---|---|-| claude | 5h | 11 % | 14 % | 3.0 % |-| claude | Fable | 0 % | 0 % | 0.0 % |-| claude | week | 17 % | 23 % | 6.0 % |-| codex | week | 9 % | 9 % | 0.0 % |--*The limits are per account, not per run: every AI thread signed in as this user draws on the same numbers, so a run made while other threads were working shows their usage too. Read it as an upper bound unless this run was the only thread active.*--## Given back--0 issue(s) or PR(s) filed by this run's AI to make the tool better for every Adom user.--Adom processes PRs within minutes during business hours: a non-stop PR intake runs all day.