2 layers
2 layers
Flsh led
JBlitzar/flshflashlight
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 10
- Pads
- 45
- Tracks, vias
- 49, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Oct 2026
- Updated
- 5 Nov 2026
Overview
Flsh led is an open-source printed circuit board by JBlitzar, from the JBlitzar/flsh repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board with 19 parts on 10 nets, routed with 49 tracks and 0 vias.
Its parts include 9 diodes and 8 capacitors.
README
README.mdflsh
A flashlight with the brightness of 83 iphones.
Some features:
- 9x OSRAM GW PUSTA1.PM-PBQB-XX52-1-1050-R18 for ~5000 lm nominal.
- XL6006 driver board designed to boost a 2x21700 pack up to the required 28v@1.1A
I made this because I thought it would be pretty cool. Also I got to think about designing power circuitry. I looked at a lot of different ICs before settling on the XL6006. In the end, TI and Analog both were beaten out by Shanghai Xinlong Semiconductor Technology Co., Ltd, so there you go! While the XL6006 gets a bad rap on cheap aliexpress boost boards, the chip itself will work fine if you have a good inductor etc. And it only requires like five passives to work! I evaluated a lot of different designs, see planning.
In terms of the LEDs, I pretty much went on to LCSC and clicked "sort high to low" on lumens. But really, I thought this was more reasonable than most CoB solutions.
You might be wondering why they are in series. This is to prevent thermal runaway, where one LED uses slightly more current, which causes it to get hotter, which causes it to hog current slightly more, etc in a positive feedback loop. You can use ballast resistors. I just wired them in series and accepted the steep boost ratio.
PWM dimming? hahaha you can source and solder a different sense resistor to get a different brightness.
How to use?
2x21700 to VIN / GND on the boost board, then LED+ / LED- on the boost board to VCC / GND on the emitter board.
As you can tell, this is, for the moment, mostly the bones of a flashlight (ie the PCBs) rather than an actual assembly.
Schematics
flsh boost
flsh led
PCBs
flsh boost
View on KiCanvas | View iBOM (or open PCB/flsh/bom/ibom.html locally)
 |  |
flsh led
 |  |
About cost
This is a ballpark, YMMV based on sourcing, promotions, discounts
Overall BOM
| Item | Link | Extended Cost | Notes |
|---|---|---|---|
| 10x LEDs (MOQ) | https://www.lcsc.com/product-detail/C46046287.html | 17.15 | |
| LED PCB | N/A | 2.44 | |
| Boost components | N/A | 18 | See fabrication BOM in README for C-numbers |
| LCSC shipping | N/A | 8 | |
| JLC shipping | N/A | 3.3 | |
| Total | 48.89 |
Fabrication BOMs
flsh boost
| Designator | Footprint | Quantity | Value | LCSC Part # |
|---|---|---|---|---|
| C1 | C_2220_5750Metric | 1 | 47uF 35V | C27840590 |
| C2 | CAP-SMD_BD10.0-L10.3-W10.3-FD | 1 | 100uF 63V | C53120969 |
| C3, C4 | C_1206_3216Metric | 2 | 1uF | C13832 |
| D1 | D_SMA | 1 | SS38 | C64999 |
| DZ1 | D_SOD-123F | 1 | ZENER (BZT52C39, 39V) | C49023525 |
| L1 | IND-SMD_L13.8-W12.6_H6.5 | 1 | YSPI1365-470M (47uH) | C497913 |
| R1 | R_1206_3216Metric | 1 | 2k | C133543 |
| RS1 | R_2512_6332Metric | 1 | JER2512F2R220 (0.22R) | C49164922 |
| U2 | TO-263-5_L10.2-W9.9-P1.70-LS14.4-TL | 1 | XL6006E1 | C73346 |
flsh led
| Designator | Footprint | Quantity | Value | LCSC Part # |
|---|---|---|---|---|
| LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9 | LED-SMD_3P-L3.7-W3.7_GW-PUSTA1.PM-NAPD-XX510-1-1050-R18 | 9 | GW PUSTA1.PM-PBQB-XX52-1-1050-R18 | C46046287 |
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | GW PUSTA1.PM-PBQB-XX52-1-1050-R18 | easyeda2kicad:LED-SMD_3P-L3.7-W3.7_GW-PUSTA1.PM-NAPD-XX510-1-1050-R18 | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9 |
| 8 | C_US | Capacitor_SMD:C_1206_3216Metric | C1, C2, C3, C4, C5, C6, C7, C8 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2 |
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Questions
What parts does the Flsh led use?
19 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 Flsh led KiCad files?
From the JBlitzar/flsh repository on GitHub, at the commit this page was made from: the board is PCB/flsh/flsh_led.kicad_pcb and its schematic PCB/flsh/flsh.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flsh led design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).