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 layers64 × 50 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
- 64 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 52
- Nets
- 57
- Pads
- 204
- Tracks, vias
- 585, 58
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 Jul 2023
- Updated
- 9 Apr 2025
Overview
SD2IEC 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 64 × 50 mm with 52 parts on 57 nets, routed with 585 tracks and 58 vias.
It is built around the MIC5504-3.3YM5, AO3400A and LL4148. Its parts include 17 resistors, 10 capacitors, 7 connectors, 4 switches and 3 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
MIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
LL4148
LL-341 Independent 1V@10mA 200mA 4A 4ns 500mW 5uA@75V 75V LL-34 Switching Diodes ROHSMDDSwitching Diodes
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
52| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R6, R8, R10, R12, R14 |
| 5 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4, C5, C6, C7 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | H1, H2, H3, H4 |
| 3 | 10μF | Capacitor_Tantalum_SMD:CP_EIA-3216-10_Kemet-I_Pad1.58x1.35mm_HandSolder | C8, C9, C10 |
| 3 | 18R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R9, R13 |
| 3 | 22K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R11, R15 |
| 3 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 330R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R16, R17 |
| 2 | 56pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 2 | IEC (DIN6) | DTLib:DIN6_PCB_RIGHTANGLE | J4, J5 |
| 1 | 5VDC IN | DTLib:COMMODORE_CASSETTE_EdgeMount | J2 |
| 1 | 8MHz | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | ATmega1284P-20AU | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | AVR-ISP-6 | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J1 |
| 1 | GREEN | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | IEC_ALT1 | Connector_JST:JST_XH_B6B-XH-A_1x06_P2.50mm_Vertical | J8 |
| 1 | IEC_ALT2 | Connector_JST:JST_XH_B6B-XH-A_1x06_P2.50mm_Vertical | J9 |
| 1 | IEC_SEL | Button_Switch_THT:SW_DIP_SPSTx02_Slide_9.78x7.26mm_W7.62mm_P2.54mm | SW1 |
| 1 | LL4148 | Diode_SMD:D_MiniMELF | D1 |
| 1 | LOGO | DTLib:Logo | G*** |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | NEXT | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx58-2LFS | SW3 |
| 1 | PREV | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx58-2LFS | SW2 |
| 1 | RED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_PTS645 | SW4 |
| 1 | SD_Card | DTLib:SD_Kyocera_145638009211859+ | J3 |
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Questions
How big is the SD2IEC PCB?
It measures 64 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SD2IEC use?
52 parts, built around the MIC5504-3.3YM5, AO3400A and LL4148. 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 SD2IEC KiCad files?
From the schenkmi/electronic-retro-computing-projects repository on GitHub, at the commit this page was made from: the board is sd2iec-kicad/SD2IEC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SD2IEC design in my own project?
Its repository states no licence, so its author keeps all rights: ask schenkmi before reusing the design.