# PCB

Board size: 59.69x48.26 mm (2.35x1.9 inches)

- This is the size of the rectangle that contains the board
- Thickness: 1.6 mm (63 mils)
- Material: FR4 / Kapton
- Finish: ENIG
- Layers: 4
- Copper thickness: 35 µm

Solder mask: TOP / BOTTOM

- Color: Top: Blue / Bottom: Red

Silk screen: TOP / BOTTOM

- Color: Top: White / Bottom: Black

Special features:

- Edge connector: yes, bevelled
- Castellated pads
- Edge plating

Stackup:

Impedance controlled: YES

| Name                 | Type                 | Color            | Thickness | Material        | Epsilon_r | Loss tangent |
|----------------------|----------------------|------------------|-----------|-----------------|-----------|--------------|
| F.SilkS              | Top Silk Screen      | White            |           | Liquid Photo    |           |              |
| F.Paste              | Top Solder Paste     |                  |           |                 |           |              |
| F.Mask               | Top Solder Mask      | Blue             |        10 | Liquid Ink      |       3.3 |        0.000 |
| F.Cu                 | copper               |                  |        35 |                 |           |              |
| dielectric 1         | prepreg              |                  |       480 | FR4             |       4.5 |        0.020 |
| In1.Cu               | copper               |                  |        35 |                 |           |              |
| dielectric 2         | core                 |                  |       480 | FR4             |       4.5 |        0.020 |
| In2.Cu               | copper               |                  |        35 |                 |           |              |
| dielectric 3 (1/2)   | prepreg              |                  |       240 | Kapton          |       3.2 |        0.004 |
| dielectric 3 (2/2)   | prepreg              |                  |       240 | Kapton          |       3.2 |        0.004 |
| B.Cu                 | copper               |                  |        35 |                 |           |              |
| B.Mask               | Bottom Solder Mask   | Red              |        10 | Dry Film        |       3.3 |        0.000 |
| B.Paste              | Bottom Solder Paste  |                  |           |                 |           |              |
| B.SilkS              | Bottom Silk Screen   | Black            |           | Direct Printing |           |              |

# Important sizes

Clearance: 0.15 mm (6 mils)

Track width: 0.15 mm (6 mils)

- By design rules: 0.13 mm (5 mils)

Drill: 0.35 mm (14 mils)

- Vias: 0.35 mm (14 mils) [Design: 0.3 mm (12 mils)]
- Pads: 0.7 mm (28 mils)
- The above values are real drill sizes, they add 0.1 mm (4 mils) to plated holes (PTH)

Via: 0.51/0.25 mm (20/10 mils)

- By design rules: 0.46/0.2 mm (18/8 mils)
- Micro via: no [0.2/0.1 mm (8/4 mils)]
- Buried/blind via: no
- Total: 56 (thru: 56 buried/blind: 0 micro: 0)

Outer Annular Ring: 0.08 mm (3 mils)

- By design rules: 0.08 mm (3 mils)

Eurocircuits class: 6D
- Using min drill 0.25 mm for an OAR of 0.13 mm


# General stats

Components count: (SMD/THT)

- Top: 61/12 (SMD + THT)
- Bottom: 0/0 (NONE)

Defined tracks:

- 0.15 mm (6 mils)
- 0.3 mm (12 mils)
- 0.64 mm (25 mils)

Used tracks:

- 0.15 mm (6 mils) (276) defined: yes
- 0.3 mm (12 mils) (11) defined: yes
- 0.64 mm (25 mils) (175) defined: yes

Defined vias:

- 0.51/0.25 mm (20/10 mils)
- 0.89/0.51 mm (35/20 mils)

Used vias:

- 0.51/0.25 mm (20/10 mils) (Count: 23, Aspect: 3.1 A) defined: yes
- 0.89/0.51 mm (35/20 mils) (Count: 33, Aspect: 1.8 A) defined: yes

Holes (excluding vias):

- 0.8 mm (31 mils) (4)
- 0.85 mm (33 mils) (2)
- 0.95 mm (37 mils) (3)
- 1.2 mm (47 mils) (20)
- 3.2 mm (126 mils) (4)

Oval holes:

- 0.6x1.3 mm (24x51 mils) (2)

Drill tools (including vias and computing adjusts and rounding):

- 0.35 mm (14 mils) (23)
- 0.6 mm (24 mils) (33)
- 0.7 mm (28 mils) (2)
- 0.9 mm (35 mils) (4)
- 0.95 mm (37 mils) (2)
- 1.05 mm (41 mils) (3)
- 1.3 mm (51 mils) (20)
- 3.2 mm (126 mils) (4)


# Schematic

![Schematic](Schematic.svg){ width=16.5cm height=11.7cm }



# PCB Layers

![Top copper and silkscreen](Layers/light_control-assembly-front.pdf){ width=16.5cm height=11.7cm }

![Bottom copper and silkscreen](Layers/light_control-assembly-bottom.pdf){ width=16.5cm height=11.7cm }