2 layers389.2 × 181.8 mm
C64
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.
260 parts
2 layers50 × 49.4 mm
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.
- Size
- 50 × 49.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 49
- Nets
- 55
- Pads
- 197
- Tracks, vias
- 702, 91
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 Jul 2023
- Updated
- 9 Apr 2025
Overview
SD2IECplug is an open-source printed circuit board by schenkmi, from the schenkmi/electronic-retro-computing-projects repository on GitHub. It is a 2-layer board of 50 × 49.4 mm with 49 parts on 55 nets, routed with 702 tracks and 91 vias.
It is built around the ATMEGA644-20AU, AMS1117-3.3 and BSS138. Its parts include 16 resistors, 8 connectors, 7 capacitors, 4 transistors and 3 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
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)
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
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
README
SD2IECplug/README.mdSD2IEC Pluggable
- KiCAD project files for my take on a SD2IEC compatible board.
- The schematics are heavily based on the design by Shadowolf.
- The BOM export is included in the repository.
- There should probably be more documentation here, but while it is still missing you may find some additional information on my blog.
- This is all work in progress with absolutely no guarantees. USE AT YOUR OWN RISK!
Revision 2
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. Note: In this revision, the numbering of the LEDs has been accidentally reversed. This has been fixed later on the master branch.
Revision 1
The first revision required a much larger PCB but featured a full-size SD slot and experimental support for TAPuino functionality. The latter was never tested though and probably wouldn't work.
If you don't intend to use the TAPuino functionality (and there isn't any firmware support for this yet) you can omit R16-R21 and the optocoupler U3. Also, the board can be power either through the USB or the tape port connector so you don't necessarily need to fit both.
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Parts
49| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10k | Resistors_SMD:R_0805_HandSoldering | R3, R7, R10, R13 |
| 4 | 18 | Resistors_SMD:R_0805_HandSoldering | R2, R6, R9, R12 |
| 4 | 22k | Resistors_SMD:R_0805_HandSoldering | R4, R8, R11, R14 |
| 4 | BSS138 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q2, Q3, Q4 |
| 3 | 10µ | Capacitors_Tantalum_SMD:CP_Tantalum_Case-S_EIA-3216-12_Hand | C3, C4, C5 |
| 2 | 100n | Capacitors_SMD:C_0805_HandSoldering | C6, C7 |
| 2 | 330 | Resistors_SMD:R_0805_HandSoldering | R1, R5 |
| 2 | 56p | Capacitors_SMD:C_0805_HandSoldering | C1, C2 |
| 2 | MountingHole | Mounting_Holes:MountingHole_2.7mm_M2.5 | MH3, MH4 |
| 2 | SW_Push | Buttons_Switches_SMD:SW_SPST_FSMSM | SW1, SW2 |
| 2 | ZipTie | DIN-Connectors:ZipTie_3.0mm | MH1, MH2 |
| 1 | 1N5817 | Diodes_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D3 |
| 1 | 2.2R | Resistors_SMD:R_0805_HandSoldering | R15 |
| 1 | 8MHz | Crystals:Crystal_HC49-4H_Vertical | Y1 |
| 1 | AMS1117-3.3 | TO_SOT_Packages_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | ATMEGA644-20AU | Housings_QFP:TQFP-44_10x10mm_Pitch0.8mm | U1 |
| 1 | Aux | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | J3 |
| 1 | C64-CassettePort | hackup:C64-Cassette-Port-Female | J5 |
| 1 | C64-CassettePort | hackup:C64-Cassette-Port-Male | J6 |
| 1 | IEC | DIN-Connectors:DIN-6-Variable | J4 |
| 1 | ISP | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | J1 |
| 1 | LOGO | Logo:bigby2 | G*** |
| 1 | Power | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J7 |
| 1 | SD Connector | lib:Conn_uSDcard | XS1 |
| 1 | X3 | Pin_Headers:Pin_Header_Straight_1x10_Pitch2.54mm | J8 |
| 1 | X6 | Pin_Headers:Pin_Header_Straight_1x05_Pitch2.54mm | J2 |
| 1 | green | LEDs:LED_0805_HandSoldering | D2 |
| 1 | nB | Resistors_SMD:R_0805_HandSoldering | R16 |
| 1 | red | LEDs:LED_0805_HandSoldering | D1 |
Questions
How big is the SD2IECplug PCB?
It measures 50 × 49.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SD2IECplug use?
49 parts, built around the ATMEGA644-20AU, AMS1117-3.3 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 SD2IECplug KiCad files?
From the schenkmi/electronic-retro-computing-projects repository on GitHub, at the commit this page was made from: the board is SD2IECplug/SD2IECplug.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SD2IECplug design in my own project?
Its repository states no licence, so its author keeps all rights: ask schenkmi before reusing the design.
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