DB25 External
About the DB25 External PCB
DB25 External is an open source PCB design by BlueSCSI, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 49 × 53.2 mm, with 62 components from 21 distinct parts.
Other key parts include the 74HC14, AMS1117-2.85, LVTH245 and LVT125. By type, the board carries 33 resistors, 16 capacitors, 7 ICs, 3 diodes and 1 fuse.
From the project
BlueSCSI v2/Ultra - an open source, open hardware, SCSI emulator using the Pi Pico PR2040 and Pico 2 RP2350
Main components on the DB25 External
DB25 External bill of materials (BOM)
62 components, 21 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC14 | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | AMS1117-2.85 | SOT-223-3_TabPin2 | U3 |
| 2 | LVTH245 LVT245 | TSSOP-20_4.4x6.5mm_P0.65mm | U4, U9 |
| 3 | LVT125 | TSSOP-14_4.4x5mm_P0.65mm | U5, U6, U7 |
| 1 | C883111 Polyfuse | Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F2 |
| 1 | Pico_Footprint | BluePillModule | RP1 |
| 1 | C693844 MicroSD-TF-06 | TF-06_MicroSD | SD2 |
| 1 | C2480 D | D_SMA | D1 |
| 1 | C72041 LED | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | C2290 LED | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
| 1 | 0.1UF 100n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 2 | 0.1UF 0.1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2, C5 |
| 2 | 47UF 47uF | C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C3, C4 |
| 2 | 4.7UF 4.7uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C6, C12 |
| 4 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C9, C13, C14 |
| 2 | 0.1UF 0.1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C11 |
| 3 | 4.7UF 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C10, C15, C16 |
| 18 | 110 R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8 +10 |
| 1 | 470 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11 |
| 13 | 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R13, R14, R15, R16, R17, R18, R19 +5 |
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| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 4.7K 4.7k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R56 |
DB25 External design files
The KiCad project lives in the BlueSCSI/BlueSCSI-v2 repository on GitHub; these links point at the commit this page was built from.
DB25 External: common questions
How big is the DB25 External PCB?
The DB25 External measures 49 × 53.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DB25 External?
62 components, from 21 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the DB25 External design files?
From the BlueSCSI/BlueSCSI-v2 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the DB25 External design in my own project?
Yes, under the terms of its GPL-3.0 license, which BlueSCSI chose for the repository.
