Build guide

Lie Detector

13×24 @ 2.54mm pitch · 12 components · 15 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.

15 wires to prepare; 322mm total wire, including end allowances.

Parts List

9 unique parts

Ref DesPartValueManufacturerPart NumberQtyLink
C1Ceramic Cap100nF——1Amazon
D1Diode (axial)——1—
J1Power Input (2-pin)——1—
LED1, LED2LED——2Amazon
Q1Potentiometer——1—
Q2, Q3NPN Transistor (TO-92)——2Amazon
R1Resistor (axial)100k——1Amazon
R2, R3Resistor (axial)680——2Amazon
U1Finger Pads——1—

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2. Cut wires

Cutting quantities by color and length

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

Cut#NetColorRouteCut LengthBends
6SINKBlackG22 → I2118mm10mm (90°)
12GNDBlackD5 → G821mm—
11SENSEBlueH10 → G1423mm8mm (90°)
5VCCBlueB7 → B1325mm—
10SENSEGreenK6 → K815mm—
4REDGreenE17 → I1823mm15mm (90°)
1DARLRedG13 → H1414mm—
7SINKRedH20 → H1523mm—
13GNDRedF9 → J1023mm8mm (90°)
3GREENWhiteB17 → B2018mm—
9PADWhiteD11 → G630mm18mm (90°)
15GNDWhiteH13 → D2140mm25mm (90°)
2GREENYellowE18 → C1815mm—
8SINKYellowI16 → F1618mm—
14GNDYellowK11 → I1218mm10mm (90°)

Total wire: 322mm (12.7in)

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 14mm.
Bend ruler and shape for wire 2
Cut 15mm.
Bend ruler and shape for wire 3
Cut 18mm.
Bend ruler and shape for wire 4
Cut 23mm. Bend 90° down at 15mm.
Bend ruler and shape for wire 5
Cut 25mm.
Bend ruler and shape for wire 6
Cut 18mm. Bend 90° up at 10mm.
Bend ruler and shape for wire 7
Cut 23mm.
Bend ruler and shape for wire 8
Cut 18mm.
Bend ruler and shape for wire 9
Cut 30mm. Bend 90° right at 18mm.
Bend ruler and shape for wire 10
Cut 15mm.
Bend ruler and shape for wire 11
Cut 23mm. Bend 90° down at 8mm.
Bend ruler and shape for wire 12
Cut 21mm.
Bend ruler and shape for wire 13
Cut 23mm. Bend 90° right at 8mm.
Bend ruler and shape for wire 14
Cut 18mm. Bend 90° down at 10mm.
Bend ruler and shape for wire 15
Cut 40mm. Bend 90° left at 25mm.

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 · G13H14
W2 · E18C18
W3 · B17B20
W4 · E17I18
W5 · B7B13
W6 · G22I21
W7 · H20H15
W8 · I16F16
W9 · D11G6
W10 · K6K8
W11 · H10G14
W12 · D5G8
W13 · F9J10
W14 · K11I12
W15 · H13D21
W1 · G13H14W2 · E18C18W3 · B17B20W4 · E17I18W5 · B7B13W6 · G22I21W7 · H20H15W8 · I16F16W9 · D11G6W10 · K6K8W11 · H10G14W12 · D5G8W13 · F9J10W14 · K11I12W15 · H13D21

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 · G13H14
W2 · E18C18
W3 · B17B20
W4 · E17I18
W5 · B7B13
W6 · G22I21
W7 · H20H15
W8 · I16F16
W9 · D11G6
W10 · K6K8
W11 · H10G14
W12 · D5G8
W13 · F9J10
W14 · K11I12
W15 · H13D21
W1 · G13H14W2 · E18C18W3 · B17B20W4 · E17I18W5 · B7B13W6 · G22I21W7 · H20H15W8 · I16F16W9 · D11G6W10 · K6K8W11 · H10G14W12 · D5G8W13 · F9J10W14 · K11I12W15 · H13D21