2 layers400.9 × 280.5 mm
2 layers124.3 × 131.7 mm
MegaDuck SJC
ManCloud/MegaDuck_SJC2WIP - Reverse Engineering Project of the MegaDuck Super Junior Computer
- Size
- 124.3 × 131.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 102
- Nets
- 177
- Pads
- 582
- Tracks, vias
- 3,508, 229
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Dec 2025
- Updated
- 14 Mar 2026
Overview
MegaDuck SJC is an open-source printed circuit board by ManCloud, from the ManCloud/MegaDuck_SJC repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 124.3 × 131.7 mm with 102 parts on 177 nets, routed with 3,508 tracks and 229 vias.
It is built around the LM324, LM386 and CD4066BE, with the 74HC00D, 74LS174DC and 74LS32SC among its other parts. Its parts include 33 resistors, 21 capacitors, 12 ICs, 10 diodes and 7 connectors.
Main components
7
LM324
SOP-14-1.5V~10V 0℃~+70℃ 24V 250nA 3V~20V 4 40mA 50nA 700uA 7mV 80dB SOP-14 Operational Amplifier ROHSHXY MOSFETOperational Amplifier
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
CD4066BE
PDIP-14-55℃~+125℃ 125Ω 15ns 1:1 3V~18V 40MHz PDIP-14 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
SPX29300T-L-2.5
TO-263-3-40℃~+125℃@(Tj) 1 16V 2.5V 3A 400uVrms 450mV@(3A) Fixed Over Current Protection Positive TO-263-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMaxLinearVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
102| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | FerriteBead | Inductor_THT:L_Axial_L5.3mm_D2.2mm_P2.54mm_Vertical_Vishay_IM-1 | FB101, FB102, FB103, FB104, FB105, FB106, FB107, FB108, FB109, FB110, FB111, FB112, FB113, FB114 |
| 9 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D102, D103, D104, D105, D106, D107, D108, D109, D110 |
| 7 | 100n | Capacitor_SMD:C_0805_2012Metric | C115, C116, C117, C118, C119, C120, C121 |
| 6 | 1u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C102, C103, C104, C105, C106, C107 |
| 5 | 10k | Resistor_SMD:R_0805_2012Metric | R109, R116, R117, R118, R121 |
| 4 | 220 | Resistor_SMD:R_0805_2012Metric | R103, R104, R105, R107 |
| 4 | 47k | Resistor_SMD:R_0805_2012Metric | R106, R110, R115, R131 |
| 4 | 4k7 | Resistor_SMD:R_0805_2012Metric | R108, R126, R127, R128 |
| 3 | 100k | Resistor_SMD:R_0805_2012Metric | R112, R113, R125 |
| 3 | 10u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C108, C109, C111 |
| 3 | 680 | Resistor_SMD:R_0805_2012Metric | R111, R114, R130 |
| 2 | 220u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C101, C110 |
| 2 | 27p | Capacitor_SMD:C_0805_2012Metric | C113, C114 |
| 2 | CD4066BE | Package_DIP:DIP-14_W7.62mm | U106, U107 |
| 2 | GM76C88LFW-15 | Gekkio_Package_SO:Sharp_SOIC-28W_8.6x18mm_P1.27mm | U102, U103 |
| 2 | NP | Resistor_SMD:R_0805_2012Metric | R132, R133 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP101, TP102 |
| 1 | 10M | Resistor_SMD:R_0805_2012Metric | R123 |
| 1 | 15k | Resistor_SMD:R_0805_2012Metric | R124 |
| 1 | 180k | Resistor_SMD:R_0805_2012Metric | R129 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric | R102 |
| 1 | 1M2 | Resistor_SMD:R_0805_2012Metric | R119 |
| 1 | 1N4001 | Diode_THT:D_A-405_P7.62mm_Horizontal | D101 |
| 1 | 27C040 | Package_DIP:DIP-32_W15.24mm | U111 |
| 1 | 2k2 | Resistor_SMD:R_0805_2012Metric | R101 |
| 1 | 330k | Resistor_SMD:R_0805_2012Metric | R122 |
| 1 | 4.194304MHz | Crystal:Crystal_HC18-U_Horizontal | Y101 |
| 1 | 470u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C112 |
| 1 | 560k | Resistor_SMD:R_0805_2012Metric | R120 |
| 1 | 74HC00 | Package_DIP:DIP-14_W7.62mm | U108 |
| 1 | 74LS174 | Package_DIP:DIP-16_W7.62mm | U110 |
| 1 | 74LS32 | Package_DIP:DIP-14_W7.62mm | U109 |
| 1 | 75k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV101 |
| 1 | C9012 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q101 |
| 1 | DMG CPU | Gekkio_Package_QFP:Sharp_QFP-80_14x20mm_P0.8mm | U101 |
| 1 | EXT_AUDIO | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J106 |
| 1 | Edge_Connector | MegaDuck:Edge_Connector | J103 |
| 1 | LCD_CON | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Horizontal | J104 |
| 1 | LM324 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U105 |
| 1 | LM324 | Package_DIP:DIP-14_W7.62mm | U113 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm | U104 |
| 1 | MOUSE_PORT | MegaDuck:Mouse_Connector | J107 |
| 1 | MemoryCard | Eigene:Edge-Cart-Connector_2x18_P2.54mm_Horizontal | J102 |
| 1 | ProgrammCard | Eigene:Edge-Cart-Connector_2x18_P2.54mm_Horizontal | J101 |
| 1 | Voice_Board_Mock | MegaDuck:MD_VoiceChip | J108 |
Questions
How big is the MegaDuck SJC PCB?
It measures 124.3 × 131.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MegaDuck SJC use?
102 parts, built around the LM324, LM386, CD4066BE and 74HC00D. 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 MegaDuck SJC KiCad files?
From the ManCloud/MegaDuck_SJC repository on GitHub, at the commit this page was made from: the board is Hardware/Main-Board/Main-Board.kicad_pcb and its schematic Hardware/ASIC-Board/ASIC-Board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MegaDuck SJC design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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