Build guide

Emergency Light

15×27 @ 2.54mm pitch · 14 components · 5 wires

1. Prepare

Verify component pinouts against each manufacturer’s datasheet before wiring. Label cut wires with their wire numbers; the same numbers follow them through every stage. Wire colors are written out for black-and-white printing. Custom colors can be named in the wire library.

Progress is saved on this browser for this board revision. Changes to the board or measurements start a new checklist. Printed diagrams are references, not life-size templates.

5 wires to prepare; 152mm total wire, including end allowances.

Parts List

8 unique parts

Ref DesPartValueManufacturerPart NumberQtyLink
D1, D2Diode (axial)1N4001——2—
J1, J2Power Input (2-pin)——2—
LED1, LED2, LED3LEDWhite——3Amazon
Q1PNP Transistor (TO-92)——1—
R1Resistor (axial)150——1Amazon
R2Resistor (axial)330——1Amazon
R3Resistor (axial)1k——1Amazon
R4, R5, R6Resistor (axial)100——3Amazon

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2. Cut wires

Cutting quantities by color and length

5 wires · +5mm per end for lead-through

Cut#NetColorRouteCut LengthBends
5GNDBlueM12 → L2546mm38mm (90°)
4GNDGreenL3 → F325mm—
1BATRedC6 → J628mm—
3GNDWhiteL11 → L525mm—
2LAMPYellowK16 → K928mm—

Total wire: 152mm (6.0in)

3. Bend wires

Use the straight-line ruler to mark bend points on the wire before bending. Use the bent shape as a visual reference while bending.

Bend ruler and shape for wire 1
Cut 28mm.
Bend ruler and shape for wire 2
Cut 28mm.
Bend ruler and shape for wire 3
Cut 25mm.
Bend ruler and shape for wire 4
Cut 25mm.
Bend ruler and shape for wire 5
Cut 46mm. Bend 90° left at 38mm.

4. Place wires

Component side. Select a wire to emphasize its route in its own color and highlight its endpoints. Wires follow number order, matching the bend guide and solder checklist.

W1 · C6J6
W2 · K16K9
W3 · L11L5
W4 · L3F3
W5 · M12L25
W1 · C6J6W2 · K16K9W3 · L11L5W4 · L3F3W5 · M12L25

5. Solder connections

Bottom view: horizontally mirrored. Coordinate names still identify the same physical holes. Highlights mark wire endpoints; wire routes belong on the component side. Check each connection and the listed solder bridges.

Board is horizontally mirrored. Column A is on the right.

W1 · C6J6
W2 · K16K9
W3 · L11L5
W4 · L3F3
W5 · M12L25
W1 · C6J6W2 · K16K9W3 · L11L5W4 · L3F3W5 · M12L25