Computer Clock (555)

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.

17 wires to prepare; 433mm total wire, including end allowances.

Parts List

11 unique parts

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2. Cut wires

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

Total wire: 433mm (17.0in)

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.

Wire 1 — CONT — M17 → I17 — 20mm — Red

Cut 20mm.

Wire 2 — TIMING — M15 → K17 — 17mm — Yellow

Cut 17mm.

Wire 3 — TIMING — L18 → H17 — 23mm — White

Cut 23mm. Bend 90° left at 8mm.

Wire 4 — TIMING — O15 → G13 — 35mm — Green

Cut 35mm. Bend 90° left at 10mm.

Wire 5 — CLK — E17 → H13 — 28mm — Blue

Cut 28mm. Bend 90° right at 15mm.

Wire 6 — CLK — F18 → H24 — 30mm — Black

Cut 30mm. Bend 90° right at 20mm.

Wire 7 — DISCH — M10 → M11 — 13mm — Red

Cut 13mm.

Wire 8 — DISCH — K10 → G17 — 38mm — Yellow

Cut 38mm. Bend 90° down at 8mm. Bend 90° left at 25mm.

Wire 9 — VCC — L5 → G5 — 23mm — White

Cut 23mm.

Wire 10 — VCC — F4 → D5 — 18mm — Green

Cut 18mm. Bend 90° down at 10mm.

Wire 11 — VCC — K6 → I13 — 33mm — Blue

Cut 33mm. Bend 90° left at 23mm.

Wire 12 — VCC — J14 → J18 — 20mm — Black

Cut 20mm.

Wire 13 — VCC — H18 → F17 — 16mm — Red

Cut 16mm. Bend 45° up-left at 8mm.

Wire 14 — GND — H5 → E7 — 23mm — Yellow

Cut 23mm. Bend 90° down at 13mm.

Wire 15 — GND — D8 → F13 — 28mm — White

Cut 28mm. Bend 90° right at 18mm.

Wire 16 — GND — E14 → J19 — 31mm — Green

Cut 31mm. Bend 45° down-right at 10mm. Bend 45° right at 21mm.

Wire 17 — GND — K20 → E25 — 38mm — Blue

Cut 38mm. Bend 90° left at 18mm.

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.