2 layers100 × 100 mm
Combo laser driver
adeboni/laser-projector
This project is for a quadruple laser projection controller, aimed at supporting room-scale projections
169 partsGPL-3.0
2 layers365 × 89 mm
Lowd75
Chaejunhee/lowd70lowprofile mechanical keyboard
- Size
- 365 × 89 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 163
- Nets
- 115
- Pads
- 577
- Tracks, vias
- 484, 29
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Oct 2024
- Updated
- 10 Dec 2025
Overview
Lowd75 is an open-source printed circuit board by Chaejunhee, from the Chaejunhee/lowd70 repository on GitHub. It is a 2-layer board of 365 × 89 mm with 163 parts on 115 nets, routed with 484 tracks and 29 vias.
It is built around the 1N4148W and TIP120. Its parts include 75 diodes, 74 switches, 3 connectors, 1 resistor and 1 transistor.
Main components
2README
README.mdlowd70
lowprofile mechanical keyboard
Parts
163| Qty | Value | Footprint | References |
|---|---|---|---|
| 74 | 1N4148W | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +58 |
| 74 | choc_v1_SW_solder | PCM_marbastlib-choc:SW_choc_v1_1u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +58 |
| 2 | Conn_01x20_Socket | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical | J1, J2 |
| 1 | 1N4004 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D75 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | Conn_01x02_Socket | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3 |
| 1 | RotaryEncoder | Rotary_Encoder:RotaryEncoder_Alps_EC12E_Vertical_H20mm | encoder1 |
| 1 | TIP120 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | Q1 |
The 155 most common of 163 parts.
Questions
How big is the Lowd75 PCB?
It measures 365 × 89 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lowd75 use?
163 parts, built around the 1N4148W and TIP120. 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 Lowd75 KiCad files?
From the Chaejunhee/lowd70 repository on GitHub, at the commit this page was made from: the board is lowd70/lowd75/lowd75.kicad_pcb and its schematic lowd70/lowd75/lowd75.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lowd75 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Chaejunhee before reusing the design.
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