flux

#Goal

- Route the PCB for the NE555 Signal Injector such that the high-current path between the 12 V source, transformer primary (T1), flyback diode (D1), and MOSFET (Q1) is implemented with at least 1 mm trace widths, while ensuring clear physical isolation between the transformer primary side and the imbalanced secondary output at connectors J1 and J2.

#Implementation plan

1. Analyze the existing PCB layout:

1. Review the board outline (100 mm x 80 mm) and stackup, noting that the top layer is used for component placement, inner layers for ground and 12 V power, and the bottom layer for overflow.

2. Identify the primary 12 V power loop components (12 V source, T1 primary, D1, Q1) and the secondary output region (J1, J2, and associated C3).

2. Define and apply layout rules for the high-current path:

1. Set the design rule to enforce a minimum trace width of 1 mm on the 12 V source, transformer primary (T1), flyback diode (D1), and MOSFET Q1 drain/source connections.

2. Check the clearance settings between the primary and secondary regions to preserve physical isolation.

3. Route the critical high-current traces:

1. Route the trace from the 12 V source to T1 primary.

2. Connect T1 primary to D1 and then to Q1 ensuring all traces meet the 1 mm minimum width requirement.

3. Avoid routing any trace that could compromise the isolation between the primary and secondary sections.

4. Route remaining connections:

1. Complete the routing of other signals on the board ensuring they do not disturb the isolation boundaries.

5. Validate design integrity:

1. Review the final layout in the PCB editor to confirm that the primary high-current loop meets the 1 mm trace width rule.

2. Ensure that isolation between the transformer primary side and the secondary output at J1/J2 remains intact with adequate clearance.

#Success criteria

- The 12 V source, transformer primary, flyback diode D1, and MOSFET Q1 are connected with traces at least 1 mm wide.

- The physical isolation between transformer primary and the secondary output at J1/J2 is maintained.

- The PCB layout is free of airwires and spacing issues, meeting design rules.

Placed 12 component(s): D1, R3, C1, J1, J2, U1, T1, C2, C3, R2, Q1, R1

Set +12V's traceWidth to "1mm"

Set +12V's preferredTraceWidths to "1mm 1.5mm"

Set +12V's autoLayoutPriority to "1"

Set XFMR_PRIMARY_LOW's traceWidth to "1mm"

Set XFMR_PRIMARY_LOW's preferredTraceWidths to "1mm 1.5mm"

Set XFMR_PRIMARY_LOW's autoLayoutPriority to "1"

Set RED_CLIP's minKeepOut to "2mm"

Set RED_CLIP's protected to "true"

Set BLACK_CLIP's minKeepOut to "2mm"

Set BLACK_CLIP's protected to "true"

Set BLACK_CLIP_COUPLED's minKeepOut to "2mm"

Set BLACK_CLIP_COUPLED's protected to "true"