2 layers50 × 49.4 mm
SD2IECplug
schenkmi/electronic-retro-computing-projects
In revision 2, the PCB size has been reduced by more than 50% and TAPuino support has been ditched. It now features a Micro SD slot and a few other improvements.
49 parts
4 layers70 × 34 mm
KiCAD project for digital speedometer project
- Size
- 70 × 34 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 59
- Pads
- 188
- Tracks, vias
- 381, 65
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 25 Jul 2018
- Updated
- 6 Oct 2018
Overview
Speedo is an open-source printed circuit board by gpgreen, from the gpgreen/speedometer_hardware repository on GitHub. It is a 4-layer board of 70 × 34 mm with 53 parts on 59 nets, routed with 381 tracks and 65 vias.
It is built around the ATMEGA644-20AU and BSS138. Its parts include 21 capacitors, 13 resistors, 5 ICs, 5 diodes and 3 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA644-20AU
TQFP-44(10x10)-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 2KB 32 4KB 64KB 8 Bit AVR Built-in FLASH TQFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10K | Resistors_SMD:R_0603 | R2, R3, R5, R7, R8, R9, R12 |
| 6 | 100nF | Capacitors_SMD:C_0603 | C1, C15, C16, C17, C18, C20 |
| 4 | 10nF | Capacitors_SMD:C_0603 | C6, C11, C14, C23 |
| 4 | D | Diodes_SMD:D_SOD-123F | D1, D2, D4, D5 |
| 3 | 10uF | Capacitors_Tantalum_SMD:CP_Tantalum_Case-A_EIA-3216-18_Reflow | C8, C10, C19 |
| 2 | 10nF | Capacitors_SMD:C_1206 | C7, C9 |
| 2 | 1K | Resistors_SMD:R_0603 | R10, R11 |
| 2 | 1uF | Capacitors_SMD:C_1206 | C3, C4 |
| 2 | 20pF | Capacitors_SMD:C_0603 | C12, C13 |
| 1 | 100K | Resistors_SMD:R_0603 | R6 |
| 1 | 10uH | Inductors_SMD:L_1206 | L1 |
| 1 | 16MHz 18pF | Crystals:Crystal_SMD_HC49-SD | Y1 |
| 1 | 18K | Resistors_SMD:R_0603 | R13 |
| 1 | 1nF | Capacitors_SMD:C_1206 | C5 |
| 1 | 390 | Resistors_SMD:R_1206 | R1 |
| 1 | 4.7K | Resistors_SMD:R_0603 | R4 |
| 1 | 4.7nF | Capacitors_SMD:C_0603 | C2 |
| 1 | 4N25 | custom_footprint:4N2X | U3 |
| 1 | ATMEGA644-20AU | Housings_QFP:TQFP-44_10x10mm_Pitch0.8mm | U5 |
| 1 | BSS138 | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | Conn_01x08 | Connectors_Molex:Molex_PicoBlade_53398-0871_08x1.25mm_Straight | J1 |
| 1 | Conn_01x10 | Connectors_Molex:Molex_PicoBlade_53398-1071_10x1.25mm_Straight | J2 |
| 1 | D_Schottky | Diodes_SMD:D_SOD-123F | D3 |
| 1 | LT1762-3.3 | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U2 |
| 1 | LT1762-5 | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U4 |
| 1 | Prog Header | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | J3 |
| 1 | SW_Push | custom_footprint:switch-kpt-1187B-SMD | SW1 |
| 1 | US1881 | custom_footprint:TO-92-pins-3-in-a-row | U1 |
The 51 most common of 53 parts.
Questions
How big is the Speedo PCB?
It measures 70 × 34 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Speedo use?
53 parts, built around the ATMEGA644-20AU and BSS138. 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 Speedo KiCad files?
From the gpgreen/speedometer_hardware repository on GitHub, at the commit this page was made from: the board is speedo.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Speedo design in my own project?
Its repository states no licence, so its author keeps all rights: ask gpgreen before reusing the design.
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