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2 layers79.3 × 52.5 mmFlashlight, the printed circuit board in 3D

A collection of custom PCB designs, prototypes, and lab projects built for research and experimentation.

Size
79.3 × 52.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
10
Nets
4
Pads
20
Tracks, vias
0, 0
Pours
6
Routed
Not yet
KiCad
KiCad 9.0 (file 20241229)
Created
5 Oct 2026
Updated
7 Nov 2026

Overview

Flashlight is an open-source printed circuit board by Justinorange, from the Justinorange/PCB-Compilation repository on GitHub. It is a 2-layer board of 79.3 × 52.5 mm with 10 parts on 4 nets.

README

README.md

PCB-Compilation

A collection of custom PCB designs, prototypes, and lab projects built for research and experimentation.

Relay Control Board

A robust relay control and safety management board designed for hardware kill switching, power distribution, and status monitoring.

Relay Control Board Relay Control Board Schematic

Key Features:

  • Relay Outputs: Features 7 relay outputs with selectable 12V and MCU-level voltage control options, protected by a fuse and TVS diode.
  • Kill & Safety System:
    • 6 input signals with individual red status LEDs to monitor when a kill state is active.
    • 2 dedicated inputs for manual override (enables the yellow status indicator; overridden by the red kill state).
    • Active high/low configuration jumpers for flexible input/output logic.
    • Hardware override jumper to unkill the system.
  • Light Tower Status Indicators: Built using 0803 SMD LEDs for clean labeling and visual feedback:
    • Enable
    • Red: Kill enabled
    • Yellow: Manual enable
    • Green: Autonomous / default operation

View the project source and design files on GitHub.

Air Quality Sensor Breakout Boards

I am building a set of sensor breakout boards that will eventually be combined into a single air quality sensing PCB. These boards are still in progress, and I am finishing the analog sensor boards before moving on to the digital ones.

Hydrogen sensor formaldehyde sensor CO sensor Alcohol sensor

These breakout boards were made for the Machine Intelligence Laboratory (MIL) and are part of a larger integrated sensing platform. View the breakout designs on GitHub.

STUSB 4500 Controller

The STUSB 4500 controller is one of the more complicated PCBs I have made, largely due to the use of USB C protocols and having to solder it by hand.

STUSB 4500 controller

This board was made for FOCUS Lab last year and represents a more complex design in the collection. View the project source on GitHub.

Flashlight Project

This was a quick and fun project to build two flashlights that produce over 20,000 lumens each while keeping the cost as low as possible. The total cost for both was approximately $50. (I also just wanted to make a single sided aluminum PCB).

flashlight PCB Design Flashbang

View the repository and design files on GitHub.

Project Summary

This repository highlights a diverse range of custom PCB projects, including modular air quality and hydrogen sensor systems, a comprehensive relay control board with hardware safety features, research-focused USB-C power controllers, and high-output lighting builds.

Parts

10
QtyValueFootprintReferences
10LEDDiode_SMD:CREE_JU7070B_KD1, D2, D3, D4, D5, D6, D7, D8, D9, D10

Questions

How big is the Flashlight PCB?

It measures 79.3 × 52.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Flashlight use?

10 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 Flashlight KiCad files?

From the Justinorange/PCB-Compilation repository on GitHub, at the commit this page was made from: the board is Flashlight/Flashlight.kicad_pcb and its schematic Flashlight/Flashlight.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Flashlight design in my own project?

Its repository states no licence, so its author keeps all rights: ask Justinorange before reusing the design.

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