555 Metronome

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.

18 wires to prepare; 517mm total wire, including end allowances.

Parts List

11 unique parts

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2. Cut wires

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

Total wire: 517mm (20.4in)

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.

Wire 1 — CONT — L15 → I15 — 18mm — Red

Cut 18mm.

Wire 2 — TEMPO — M12 → J8 — 28mm — Yellow

Cut 28mm. Bend 90° left at 15mm.

Wire 3 — TIMING — D20 → F18 — 17mm — White

Cut 17mm.

Wire 4 — TIMING — G17 → F12 — 35mm — Green

Cut 35mm. Bend 90° up at 10mm. Bend 90° left at 23mm.

Wire 5 — BEAT — G23 → L23 — 23mm — Blue

Cut 23mm.

Wire 6 — BEAT — H24 → G12 — 53mm — Black

Cut 53mm. Bend 90° up at 10mm. Bend 90° left at 41mm.

Wire 7 — DISCH — D16 → F16 — 15mm — Red

Cut 15mm.

Wire 8 — DISCH — C15 → K8 — 48mm — Yellow

Cut 48mm. Bend 90° right at 23mm.

Wire 9 — GND — G5 → D7 — 23mm — White

Cut 23mm. Bend 90° down at 13mm.

Wire 10 — GND — B7 → E12 — 30mm — Green

Cut 30mm. Bend 90° right at 18mm.

Wire 11 — GND — D13 → F19 — 30mm — Blue

Cut 30mm. Bend 90° right at 20mm.

Wire 12 — GND — H19 → L18 — 23mm — Black

Cut 23mm. Bend 90° up at 15mm.

Wire 13 — VCC — O8 → O17 — 33mm — Red

Cut 33mm.

Wire 14 — VCC — N16 → I13 — 30mm — Yellow

Cut 30mm. Bend 90° left at 13mm.

Wire 15 — VCC — H12 → D15 — 28mm — White

Cut 28mm. Bend 90° down at 15mm.

Wire 16 — VCC — E16 → E24 — 30mm — Green

Cut 30mm.

Wire 17 — VCC — N7 → F5 — 35mm — Blue

Cut 35mm. Bend 90° left at 10mm.

Wire 18 — VCC — E4 → C5 — 18mm — Black

Cut 18mm. Bend 90° down at 10mm.

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.

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.