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 layers100 × 98.7 mm
SD2IECplug panel
schenkmi/electronic-retro-computing-projectsIn 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
- 100 × 98.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 196
- Nets
- 50
- Pads
- 788
- Tracks, vias
- 2,868, 369
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 29 Jul 2023
- Updated
- 9 Apr 2025
Overview
SD2IECplug panel 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 100 × 98.7 mm with 196 parts on 50 nets, routed with 2,868 tracks and 369 vias.
It is built around the ATMEGA644-20AU, LM1117-3.3 and IRLML2803. Its parts include 64 resistors, 32 connectors, 28 capacitors, 16 transistors and 12 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)
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
IRLML2803
SOT-231 N-channel 1.2A 15pF 1V 250mΩ@10V 3.3nC 30V 34pF 540mW 85pF N-Channel SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
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
196| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 10k | Resistors_SMD:R_0805_HandSoldering | R3, R3, R3, R3, R7, R7, R7, R7, R10, R10, R10, R10, R13, R13, R13, R13 |
| 16 | 18 | Resistors_SMD:R_0805_HandSoldering | R2, R2, R2, R2, R6, R6, R6, R6, R9, R9, R9, R9, R12, R12, R12, R12 |
| 16 | 22k | Resistors_SMD:R_0805_HandSoldering | R4, R4, R4, R4, R8, R8, R8, R8, R11, R11, R11, R11, R14, R14, R14, R14 |
| 16 | IRLML2803 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q1, Q1, Q1, Q2, Q2, Q2, Q2, Q3, Q3, Q3, Q3, Q4, Q4, Q4, Q4 |
| 12 | 10µ | Capacitors_Tantalum_SMD:CP_Tantalum_Case-S_EIA-3216-12_Hand | C3, C3, C3, C3, C4, C4, C4, C4, C5, C5, C5, C5 |
| 8 | 100n | Capacitors_SMD:C_0805_HandSoldering | C6, C6, C6, C6, C7, C7, C7, C7 |
| 8 | 330 | Resistors_SMD:R_0805_HandSoldering | R1, R1, R1, R1, R5, R5, R5, R5 |
| 8 | 56p | Capacitors_SMD:C_0805_HandSoldering | C1, C1, C1, C1, C2, C2, C2, C2 |
| 8 | MountingHole | Mounting_Holes:MountingHole_2.7mm_M2.5 | MH3, MH3, MH3, MH3, MH4, MH4, MH4, MH4 |
| 8 | SW_Push | Buttons_Switches_SMD:SW_SPST_FSMSM | SW1, SW1, SW1, SW1, SW2, SW2, SW2, SW2 |
| 8 | ZipTie | DIN-Connectors:ZipTie_2.7mm | MH1, MH1, MH1, MH1, MH2, MH2, MH2, MH2 |
| 4 | 1N5817 | Diodes_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D3, D3, D3, D3 |
| 4 | 2.2R | Resistors_SMD:R_0805_HandSoldering | R15, R15, R15, R15 |
| 4 | 8MHz | Crystals:Crystal_HC49-4H_Vertical | Y1, Y1, Y1, Y1 |
| 4 | ATMEGA644-20AU | Housings_QFP:TQFP-44_10x10mm_Pitch0.8mm | U1, U1, U1, U1 |
| 4 | Aux | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | J3, J3, J3, J3 |
| 4 | C64-CassettePort | hackup:C64-Cassette-Port-Male | J6, J6, J6, J6 |
| 4 | C64-CassettePort | hackup:C64-Cassette-Port-Female | J5, J5, J5, J5 |
| 4 | IEC | DIN-Connectors:DIN-6-Variable | J4, J4, J4, J4 |
| 4 | ISP | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | J1, J1, J1, J1 |
| 4 | LM1117-3.3 | TO_SOT_Packages_SMD:SOT-223-3_TabPin2 | U2, U2, U2, U2 |
| 4 | LOGO | Logo:bigby2 | G***, G***, G***, G*** |
| 4 | Power | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J7, J7, J7, J7 |
| 4 | SD Connector | lib:Conn_uSDcard | XS1, XS1, XS1, XS1 |
| 4 | X3 | Pin_Headers:Pin_Header_Straight_1x10_Pitch2.54mm | J8, J8, J8, J8 |
| 4 | X6 | Pin_Headers:Pin_Header_Straight_1x05_Pitch2.54mm | J2, J2, J2, J2 |
| 4 | green | LEDs:LED_0805_HandSoldering | D1, D1, D1, D1 |
| 4 | nB | Resistors_SMD:R_0805_HandSoldering | R16, R16, R16, R16 |
| 4 | red | LEDs:LED_0805_HandSoldering | D2, D2, D2, D2 |
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Questions
How big is the SD2IECplug panel PCB?
It measures 100 × 98.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SD2IECplug panel use?
196 parts, built around the ATMEGA644-20AU, LM1117-3.3 and IRLML2803. 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 panel 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-panel.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SD2IECplug panel design in my own project?
Its repository states no licence, so its author keeps all rights: ask schenkmi before reusing the design.