2 layers57 × 55.2 mm
LogicAnalyzer
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
10 parts5.1kGPL-3.0
2 layers30.5 × 15.2 mm
JouleThiefLamp
UserHackable/JouleThiefLampJouleThiefLamp
- Size
- 30.5 × 15.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 5
- Pads
- 16
- Tracks, vias
- 11, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 8 Apr 2016
- Updated
- 20 Jul 2026
Overview
JouleThiefLamp is an open-source printed circuit board by UserHackable, from the UserHackable/JouleThiefLamp repository on GitHub. It is a 2-layer board of 30.5 × 15.2 mm with 10 parts on 5 nets, routed with 11 tracks and 0 vias.
Its parts include 1 resistor, 1 diode and 1 transistor.
README
README.mdSteam Punk Joule Thief Flashlight Project
This is another one of my Cache Makers 4H projects.
We used a ferrite core to wind a small transformer, an LED, a 2N3904 Transistor and a resistor to make a tiny boost circuit regulated only by the knee voltage of the LED.
I designed the circuit board to be snapped in half, and sandwich the transformer. The whole thing was then put into a 1/2 inch copper pipe union, with a couple inches of copper pipe and a cap for a case.
JouleThiefLamp
Board dimensions
- (119996, 60000) original units
- (1.2000, 0.6000) inches
- (30.4790, 15.2400) mm
| Front | Back |
|---|---|
 |  |
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | HALF_CHOKE | HALF_CHOKE | U$2, U$3 |
| 1 | TO-92-AMMO | Q1 | |
| 1 | dummyfp2 | UNK_HOLE_2 | |
| 1 | dummyfp0 | UNK_HOLE_0 | |
| 1 | LED5MM | LED1 | |
| 1 | dummyfp1 | UNK_HOLE_1 | |
| 1 | AXIAL-0.1 | R1 | |
| 1 | AA+BATT | AA+ | U$1 |
| 1 | M01SMDNS | 1X01NS | JP1 |
Questions
How big is the JouleThiefLamp PCB?
It measures 30.5 × 15.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the JouleThiefLamp 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 JouleThiefLamp KiCad files?
From the UserHackable/JouleThiefLamp repository on GitHub, at the commit this page was made from: the board is KiCad/JouleThiefLamp/JouleThiefLamp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the JouleThiefLamp design in my own project?
Its repository states no licence, so its author keeps all rights: ask UserHackable before reusing the design.
Similar boards
- 2 layers32.2 × 15.4 mm
Protector
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
10 parts4.3kMIT - 2 layers14.4 × 10.1 mm
Q3Q SWAB A1-00 Temperature + Test Points + OPT3001
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
10 parts2.1k - 2 layers26 × 18 mm
- 2 layers44.3 × 30.5 mm
Lime2-SATA RevA
OLIMEX/OLINUXINO
OLINUXINO is Open Source / Open Hardware, low cost from EUR 24 Linux Industrial grade Single Board Computer capable to operate -25+85C
10 parts1.5k - 2 layers150 × 50 mm
Breakout 55pin 963063-15-Connector
rusefi/rusefi
rusefi - GPL internal combustion engine control unit
10 parts1.2k - 2 layers17.8 × 43.2 mm
Nano Adapter
VoronDesign/Voron-Hardware
Cool Hardware designed by the Voron Design group
10 parts1.1kGPL-3.0 - 2 layers53.9 × 23.2 mm
Buffer
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
10 parts1kGPL-3.0