USD-Turbo
About the USD-Turbo PCB
USD-Turbo is an open source PCB design by 68ec020, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 32.4 × 25.5 mm, with 15 components from 8 distinct parts.
Other key parts include the 74LVC125AD and AMS1117-3.3. By type, the board carries 5 capacitors, 5 resistors, 2 ICs, 1 connector and 1 diode.
From the project
TurboMMC uSD card interface for the BBC Micro and MMFS
Use with https://github.com/hoglet67/MMFS
Inspired by http://stardot.org.uk/forums/viewtopic.php?t=9445&f=3#p110691
The interface works in my BBC Micro. I included resistors everywhere two outputs could be active at the same time, like in the hand-drawn schematic. So, it should be safe. But: Use at your own risk!
active level shifters (74LVC125AD) instead of voltage dividers 3.3 V voltage regulator * no pull-ups on PB2, PB3, PB4, marked with VDD ? in the hand-drawn schematic (maybe I should add them, if the port is configured as input)
Main components on the USD-Turbo
USD-Turbo bill of materials (BOM)
15 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LVC125AD | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U2 |
| 1 | User Port | PinSocket_2x10_P2.54mm_Horizontal | J1 |
| 1 | uSD Card | Conn_uSDcard | XS1 |
| 1 | LED | LED_0603_1608Metric | D1 |
| 5 | C | C_0603_1608Metric | C1, C2, C3, C4, C5 |
| 4 | 56 Ω | R_0603_1608Metric | R1, R2, R3, R5 |
| 1 | 1k | R_0603_1608Metric | R4 |
USD-Turbo design files
The KiCad project lives in the 68ec020/uSD-Turbo repository on GitHub; these links point at the commit this page was built from.
- LayoutuSD-Turbo.kicad_pcb
- SchematicuSD-Turbo.kicad_sch
USD-Turbo: common questions
How big is the USD-Turbo PCB?
The USD-Turbo measures 32.4 × 25.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the USD-Turbo?
15 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the USD-Turbo design files?
From the 68ec020/uSD-Turbo repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the USD-Turbo design in my own project?
Yes, under the terms of its GPL-2.0 license, which 68ec020 chose for the repository.