2 layers225 × 356.9 mm
Ferris
pierrechevalier83/ferris
A low profile split keyboard designed to satisfy one single use case elegantly
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2 layers100.1 × 220.1 mm
4bit adder
tonygilkerson/4bit-adderA 4-bit adder
- Size
- 100.1 × 220.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 98
- Nets
- 144
- Pads
- 349
- Tracks, vias
- 633, 57
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 10 Apr 2026
- Updated
- 9 Jun 2026
Overview
4bit adder is an open-source printed circuit board by tonygilkerson, from the tonygilkerson/4bit-adder repository on GitHub. It is a 2-layer board of 100.1 × 220.1 mm with 98 parts on 144 nets, routed with 633 tracks and 57 vias.
Its parts include 49 diodes, 27 switches, 16 resistors, 1 capacitor and 1 connector.
README
README.md4-bit-adder
A 4-bit adder
Parts
98| Qty | Value | Footprint | References |
|---|---|---|---|
| 33 | 1N4001 | Diode_THT:D_T-1_P5.08mm_Horizontal | D1, D3, D22, D23, D24, D26, D27, D28, D29, D30, D31, D32, D33, D34, D35, D36 +17 |
| 24 | SR11-5V-200-2C-PH | SR11_5V_200_2C:RELAY_SR11-5V-200-2C | K1, K2, K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K20, K21, K22, K23 +8 |
| 16 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R8, R9, R10, R11, R12, R13, R15, R16, R17, R18, R19, R20, R21, R22, R23 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D10.0mm_P2.50mm | C1 |
| 1 | A | Button_Switch_THT:SW_DIP_SPSTx04_Piano_10.8x11.72mm_W7.62mm_P2.54mm | SW3 |
| 1 | A1 Yellow | LED_THT:LED_D3.0mm | D2 |
| 1 | A2 Yellow | LED_THT:LED_D3.0mm | D18 |
| 1 | A3 Yellow | LED_THT:LED_D3.0mm | D16 |
| 1 | A4 Yellow | LED_THT:LED_D3.0mm | D10 |
| 1 | B | Button_Switch_THT:SW_DIP_SPSTx04_Piano_10.8x11.72mm_W7.62mm_P2.54mm | SW4 |
| 1 | B1 Green | LED_THT:LED_D3.0mm | D21 |
| 1 | B2 Green | LED_THT:LED_D3.0mm | D19 |
| 1 | B3 Green | LED_THT:LED_D3.0mm | D17 |
| 1 | B4 Green | LED_THT:LED_D3.0mm | D15 |
| 1 | Carry1 White | LED_THT:LED_D3.0mm | D9 |
| 1 | Carry2 White | LED_THT:LED_D3.0mm | D11 |
| 1 | Carry3 White | LED_THT:LED_D3.0mm | D12 |
| 1 | Carry4 Red | LED_THT:LED_D3.0mm | D25 |
| 1 | SW_Wuerth_450301014042 | Button_Switch_THT:SW_Slide-03_Wuerth-WS-SLTV_10x2.5x6.4_P2.54mm | SW1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
| 1 | Sum1 Red | LED_THT:LED_D3.0mm | D8 |
| 1 | Sum2 Red | LED_THT:LED_D3.0mm | D13 |
| 1 | Sum3 Red | LED_THT:LED_D3.0mm | D14 |
| 1 | Sum4 Red | LED_THT:LED_D3.0mm | D20 |
The 94 most common of 98 parts.
Questions
How big is the 4bit adder PCB?
It measures 100.1 × 220.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 4bit adder use?
98 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 4bit adder KiCad files?
From the tonygilkerson/4bit-adder repository on GitHub, at the commit this page was made from: the board is kicad/4bit-adder/4bit-adder.kicad_pcb and its schematic kicad/4bit-adder/4bit-adder.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 4bit adder design in my own project?
Its repository states no licence, so its author keeps all rights: ask tonygilkerson before reusing the design.
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