Kepler x
About the Kepler x PCB
Kepler x is an open source RISC-V PCB design by kunichiko, published on GitHub under the MIT license. It is a 4-layer board measuring 144 × 150 mm, with 153 components from 68 distinct parts.
Its main chip is the CH32V003F4U6, from the RISC-V family. Other key parts include the SLG46826G, LM1117GS-3.3, INA3221, 74AHC16374 and 74LVTH162245. By type, the board carries 49 capacitors, 33 resistors, 23 ICs, 12 diodes, 9 connectors and 7 transistors.
It belongs with the audio designs in this gallery.
Main components on the Kepler x
Kepler x bill of materials (BOM)
153 components, 68 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SLG46826G | SOP65P640X120-20N | IC1 |
| 1 | LM1117GS-3.3 | SOT-223-3_TabPin2 | U2 |
| 1 | INA3221 INA3221AIRGVR | QFN-16-1EP_4x4mm_Pitch0.65mm | U3 |
| 6 | 74AHC16374 74LVC16374A | TSSOP-48_6.1x12.5mm_P0.5mm | U4, U5, U6, U7, U8, U9 |
| 1 | 74LVTH162245 74LVCR162245 | TSSOP-48_6.1x12.5mm_P0.5mm | U10 |
| 1 | WM8804GEDS/RV | WM8804GEDS-RV | U11 |
| 2 | TC7MPB9307F | TSSOP-20_4.4x6.5mm_Pitch0.65mm | U12, U13 |
| 1 | CH32V003F4U6 | QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm_ThermalVias | U14 |
| 1 | PLR135-T10 | XDCR_PLT133_T10W | U15 |
| 1 | PCM5102A | TSSOP-20_4.4x6.5mm_P0.65mm | U16 |
| 2 | XC6201P332MR-G | SOT-23-5_HandSoldering | U17, U21 |
| 1 | H11L1 | SMDIP-6_W9.53mm | U18 |
| 1 | PCA9515DP | TSSOP-8_3x3mm_Pitch0.65mm | U22 |
| 1 | 74LVC541A | TSSOP-20_4.4x6.5mm_Pitch0.65mm | U23 |
| 1 | P0082(DE0-NANO)_JP1 | MODULE_P0082_TOPMOUNT_JP1 | U25 |
| 1 | P0082(DE0-NANO)_JP2 | MODULE_P0082_TOPMOUNT_JP2 | U26 |
| 2 | 2SA1162GR | SC-59_Handsoldering | Q1, Q2 |
| 4 | 2SC2712GR 2SC2712-GR | SC-59_Handsoldering | Q3, Q4, Q5, Q6 |
| 1 | 2SC2712-GR | SC-59_Handsoldering | Q7 |
| 1 | ASV-24.576MHZ ASV-24.576MHz | Oscillator_SMD_Abracon_ASE-4Pin_3.2x2.5mm_HandSoldering | X1 |
Show 48 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | XJHCELNANF-12MHZ | Crystal_SMD_HC49-SD | Y1 |
| 1 | HDMI_C_1.3 | HDMI_Mini_Female_2001-1-2-21-00-BK | J1 |
| 1 | C668608 MIDI OUT | AudioJack_3.5_pj313d-smt | J3 |
| 1 | AUDIOJACK3 AudioJack3 | AudioJack_3.5_pj313d-smt | J5 |
| 1 | C668608 MIDI IN | AudioJack_3.5_pj313d-smt | J6 |
| 1 | CONN_01X02_MALE Conn_01x02_Pin | PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | MICRO_SD_CARD_DET_HIROSE_DM3AT Micro_SD_Card_Det_Hirose_DM3AT | microSD_HC_Hirose_DM3AT-SF-PEJM5 | J11 |
| 1 | Conn_01x02_Pin | PinHeader_1x02_P2.54mm_Vertical | J13 |
| 2 | Conn_01x03_Pin | PinHeader_1x03_P2.54mm_Vertical | J15, J16 |
| 5 | 4.7K 4.7k | R_Array_Convex_4x0603 | RP1, RP2, RP3, RP4, RP7 |
| 2 | 270 | R_Array_Convex_4x0603 | RP5, RP6 |
| 2 | 47K 47k | R_Array_Convex_4x0603 | RP8, RP9 |
| 1 | 47 | R_Array_Convex_4x0603 | RP10 |
| 1 | SPEAKER | UGCT7525AN4 | SP1 |
| 1 | SW_DIP_x02 | SW_DIP_SPSTx02_Slide_KingTek_DSHP02TS_W7.62mm_P1.27mm | SW3 |
| 1 | PLT133/T10W | XDCR_PLT133_T10W | TR1 |
| 2 | WS2812C | WM2812C-2020 | LED1, LED2 |
| 5 | CUHS20S30 SS2040FL | D_SOD-123F | D1, D2, D6, D7, D9 |
| 3 | C72043 Led_Small | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3, D4, D5 |
| 2 | D_TVS | D_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D8, D10 |
| 1 | C72043 SS2040FL | D_SOD-123F | D11 |
| 1 | SS2040FL | D_SOD-123F | D12 |
| 3 | BK2125HS750-T BLM18AG121SN1D | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | FB1, FB2, FB3 |
| 5 | 10UF 10uF | CP_EIA-3216-18_Kemet-A | C1, C31, C32, C34, C35 |
| 1 | 100UF 100uF | CP_EIA-3528-21_Kemet-B | C2 |
| 5 | 1UF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C25, C26, C27, C28 |
| 2 | 15PF 15pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C5 |
| 16 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C6, C7, C10, C11, C13, C14, C15, C16 +8 |
| 2 | 2.2UF 2.2uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C8, C9 |
| 1 | 0.01UF 0.01uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C12 |
| 2 | 2.2NF 2.2nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C19, C20 |
| 1 | 22UF 22uF | C_1206_3216Metric | C30 |
| 13 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C36, C37, C38, C39, C40, C41, C42, C43 +5 |
| 1 | 10uF | CP_EIA-3216-18_Kemet-A | C49 |
| 2 | R100 (0.1Ω) | R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R1, R19 |
| 2 | C713431 1R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3 |
| 7 | 10K 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4, R5, R8, R10, R11, R18, R27 |
| 3 | 1K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7, R9 |
| 2 | 110 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R13 |
| 1 | 2.2K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R14 |
| 1 | 120 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15 |
| 2 | 470 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16, R17 |
| 4 | 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R20, R21, R22, R23 |
| 1 | 18K 18k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R25 |
| 1 | 33K 33k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R26 |
| 2 | 4.7K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R28, R29 |
| 4 | 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R30, R31, R32, R34 |
| 1 | 1M | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R33 |
Kepler x design files
The KiCad project lives in the kunichiko/X68k-KeplerX-PCB repository on GitHub; these links point at the commit this page was built from.
Kepler x: common questions
What microcontroller does the Kepler x use?
The Kepler x is built around the CH32V003F4U6, from the RISC-V family.
How big is the Kepler x PCB?
The Kepler x measures 144 × 150 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Kepler x?
153 components, from 68 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Kepler x design files?
From the kunichiko/X68k-KeplerX-PCB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Kepler x design in my own project?
Yes, under the terms of its MIT license, which kunichiko chose for the repository.
Can I test firmware for the Kepler x without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.
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