Adapt a specifically supported ATX supply to Smoothie-compatible power connectors and controlled startup.
Baseline documentation snapshot: 2026-10-11, before the requested connector/protection/usability revision program. New revision features require their own reviewed source and qualification evidence.
This page documents an unqualified engineering study, not a released or tested product. Saved CAD, renders and automated checks do not establish a safe assembly, compatible cable, firmware support or a usable current rating.
The retained design record states:
Current retained v12 is a conditional CAD-clean routing repair; the earlier blocked draft below is historical context. See complete IC/stock review for all56 references, existing DMN2056U-7 upgrades and conditional V1 resistor reuse. No new version added. Standard24-pin ATX only; 12V10A/5V3.75A/standby1.5A remain unqualified targets. Native Prime2590 evidence resolves the old CAD rail-numbering conflict; physical mating and host allocation remain open. J_C is point-to-point forwarding, JP3/4 factory open, not a shared bus.
Board-specific qualification limits: Native clean retained; TP10 annular/U1 return/104 checklist/stock physical gates open.
The selected study is for a standard 24-pin ATX supply, with open-drain PS_ON# control and PWR_OK conditioning. It does not support ATX12VO. Rail routing, startup control and output connector orientation must follow the selected native contract.
Power off before changing connections. Use the selected schematic and a continuity check to verify connector orientation and pin numbering before first power.
12 V at 10 A, 5 V at 3.75 A and standby at 1.5 A remain study targets rather than released ratings. Confirm host rail mapping physically; the retained source resolves a prior CAD-numbering issue without proving cable mating or real supply sequencing.
Use the configuration and firmware contract for the exact selected revision. Do not copy another module’s socket assignments or assume that an unused pin is available. First-article work must verify source selection, reset/unplug behavior, cable orientation and the actual load or sensor interface before normal operation.
The following are requirements for the next design iterations; this page does not claim they are already fitted:
Documentation route: smoothieware.org/extensions/atx-connector-board.
The 2026-10-11 upgrade program has saved additional candidates v13, v14, v15. These studies preserve the historical design described above. Their connector, LED, mechanical and protection changes are revision-specific and remain unqualified.
See the per-board changes, failures and remaining work and mandatory family specification. Use the source hash and native check for the exact candidate being reviewed; do not infer hardware ratings from a rendered population.
The third additive candidate replaces all three disposable DC fuse footprints with independent electronic protection.12V uses an external-FET bidirectional breaker;5V and standby use integrated reverse-blocking eFuses with thermal shutdown and automatic retry. Each rail has separate reverse-blink, fault and OV indicators, each with its own disable jumper. The original ATX/host connectors and mounting datum are preserved.
This enlarged74×129.5mm study is still being routed and is not a released assembly.10A/3.75A/1.5A remain unqualified targets; current-limit tolerance, transient energy, FET SOA, temperature, visible blink, cable fit and compaction require verification. See the current per-board work record before using any render or manufacturing file.
The latest saved candidate has zero native geometry errors and zero schematic-parity failures, with 35 connections still open. Six assembly views were regenerated from that source; the reviewed top view shows the entire enlarged study. Placement and protection-part net records were refreshed. These results do not establish continuity, a current rating, enclosure fit or hardware protection behavior. Compaction and consistent title typography remain open.
The three additional revisions are v13, v14, v15. They are engineering studies; saved CAD and renders do not release the hardware. The latest candidate is described below. Older baseline notes above remain historical.
a7e244c88552edde88fc1154c719cb44b91f882002ebacda63988c3d4df8d582.Applicable protection, current-path, thermal, pinout, cable access and physical tests remain open wherever the linked board record has not verified them. A zero native-error count does not close those gates.
Protected source v18; current PCB SHA-256 87a9cc38b5650988095f3c24836aad7657032c37c0b6b39238e00c2f7783509c. Fresh checks: zero enabled PCB errors/opens/parity and ERC errors; 25 PCB warnings. Electrical geometry, project rules and 94 historical files unchanged. Verified 119 model entries, 17 exports and 6 current population views, all inspected. Full documentation URL readable. Inherited dense connector annotations remain Inherited native warnings and enabled-rule exclusions remain explicit Physical/thermal/current/connector-fit qualification open No priced or area savings established by annotation candidate.
The maintainer now classifies the supported standard keyed ATX power supply as a trusted source. The added 12 V, 5 V and standby-5 V electronic protection annex is therefore unnecessary and is removed in additive v20. This supersedes the protection requirements and enlarged-board descriptions in the historical candidate sections above.
The new candidate restores 74 × 49.5 mm, removes 102 redundant protection components, and directly connects corresponding ATX/output rails without restoring disposable fuses. PS_ON control, PWR_OK conditioning, existing connector positions, test pads and four individual LED-disable links remain. Full native checks now report zero PCB errors, zero open connections, zero schematic-parity findings and zero ERC findings, with 12 PCB warnings. The LED disable links are compact front copper cut/rebridge necks requiring no purchased component. Six fresh native views were inspected, with no unresolved models, and Gerber/drill/position/schematic exports completed; current capability, physical fit, cut/rebridge usability and hardware behavior are not qualified. See the trusted-power work record.
Compact v20 renders and model provenance · Native check receipt.