4 layers22 × 60.5 mm
Stor
JBlitzar/stor
A USB2.0 High Speed flash drive with a hotswappable MicroSD backend.
65 partsGPL-3.0
2 layers18.5 × 32 mm
microSD reader
- Size
- 18.5 × 32 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 16
- Pads
- 59
- Tracks, vias
- 119, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Aug 2026
- Updated
- 26 Sep 2026
Overview
Rd is an open-source printed circuit board by JBlitzar, from the JBlitzar/rd repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 18.5 × 32 mm with 13 parts on 16 nets, routed with 119 tracks and 10 vias.
It is built around the GL823K-HCY04, TF-01A and KT-0805G, with the CL21A476MQYNNNE and U-USBAR04P-M003 among its other parts. Its parts include 6 resistors, 3 capacitors, 1 IC and 1 diode.
Main components
5
GL823K-HCY04
SSOP-16-150mil0℃~+70℃ 300uA 4.75V~5.25V 480Mbps 50mA USB 2.0 USB to SD SSOP-16-150mil USB Converters ROHSGenesys LogicUSB Converters
TF-01A
SMD1.85mm Connector and Ejector MicroSD Card (TF Card) Push-Push With Locating Pins SMD SD Card / Memory Card Connector ROHSHRO ElectronicsSD Card / Memory Card Connector
KT-0805G
0805-40℃~+85℃ 100mW 120° 2.6V~3.1V 430mcd 513nm~528nm 525nm 5mA Discrete Diode Emerald Green Water Clear 0805 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
CL21A476MQYNNNE
080547uF 6.3V X5R ±20% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
U-USBAR04P-M003
SMD0℃~+50℃ 1 1.5A 1500 Cycles 18.8mm 30V 4P Laminated board Male Type-A White SMD USB Connectors ROHSCkmtwUSB Connectors
README
README.mdrd
microSD card reader. it exposes microSD cards as a block device that you can read and write to!
Features:
- dead-simple schematic thanks to the GL823K chip
- green status LED for activity
- 4mm keychain hole
- supports USB 2.0 HS and microSD HS. 30+ MB/s speeds confirmed!
I made this project because I needed a project scoped to be able to speedrun in 36 hours wall-clock and very little actual working time. It grants me utility-- this way I can read and write to microSD cards super easily in a small form factor, using a dongle I created!! I think microSD cards are uniquely very versatile. There are ones with industrially-rated durability. There are ones that go up to 2TB. There are ones that are so dirt-cheap they cost only a little bit more than the raw NAND inside them. Also, this project unlocks a new ASIC for me that I haven't used before.
 |  |
Schematic
PCB
Production outputs like gerbers
Find them in PCB/rd/production!
BOM
Order by uploading the fabrication outputs (linked above) to jlcpcb!
| Item | Cost | Notes |
|---|---|---|
| 5x PCB (MOQ) | 2.0 | order off of JLCONE desktop to save two dollars instead of it costing $4 |
| 2x PCBA (MOQ) | 24.15 | |
| Shipping | 3.3 | Shipping special offer, otherwise costs 7 |
| Total | 29.45 |
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | easyeda2kicad:R0402 | R7, R8, R9, R10, R11 |
| 1 | 0805G | easyeda2kicad:LED0805-R-RD | LED1 |
| 1 | 100nF | easyeda2kicad:C0402 | C1 |
| 1 | 10uF | easyeda2kicad:C0402 | C3 |
| 1 | 4.7k | easyeda2kicad:R0402 | R1 |
| 1 | 47uF | easyeda2kicad:C0805 | C4 |
| 1 | GL823K-HCY04 | easyeda2kicad:SSOP-16_L4.9-W3.9-P0.64-LS6.0-BL | U1 |
| 1 | TF-01A | easyeda2kicad:TF-SMD_TF-01A | Card1 |
| 1 | U-USBAR04P-M001 | easyeda2kicad:USB-SMD_KH-USB-AM-4P-CB | USB1 |
Questions
How big is the Rd PCB?
It measures 18.5 × 32 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rd use?
13 parts, built around the GL823K-HCY04, TF-01A, KT-0805G and CL21A476MQYNNNE. 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 Rd KiCad files?
From the JBlitzar/rd repository on GitHub, at the commit this page was made from: the board is PCB/rd/rd.kicad_pcb and its schematic PCB/rd/rd.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rd 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).
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