4 layers85 × 51 mm
4 layers84.3 × 8.4 mm
Control board
rcls/discus1CPU built from discrete transistors
- Size
- 84.3 × 8.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 331
- Nets
- 182
- Pads
- 1,037
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Oct 2013
- Updated
- 18 Mar 2026
Overview
Control board is an open-source printed circuit board by rcls, from the rcls/discus repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 84.3 × 8.4 mm with 331 parts on 182 nets.
It is built around the FDV301N, NX3008PBK and PDTC124TU, with the RB751S40 among its other parts. Its parts include 106 resistors, 12 transistors and 11 diodes.
Main components
4
FDV301N
SOT-23-55℃~+150℃ 1 N-channel 1.06V 1.3pF 220mA 25V 350mW 5Ω@2.7V 6pF 700pC@4.5V 9.5pF N-Channel SOT-23 MOSFETs ROHSonsemiMOSFETsNX3008PBK
SOT-23-55℃~+150℃ 1 P-Channel 1.14W 1.1V 230mA 30V 4.1Ω@4.5V 46pF 720pC@4.5V P-Channel SOT-23 MOSFETs ROHSNexperiaMOSFETs
PDTC124TU
SOT-323-3-65℃~+150℃ 100 100mA 200mW 50V SOT-323-3 Digital Transistors ROHSNexperiaDigital Transistors
RB751S40
SOD-5231 Independent 120mA 200mA 370mV@1mA 40V 500nA@30V SOD-523 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdDiscus is an 8-bit CPU built from discrete transistors. Refer to the website for documentation
Parts
331| Qty | Value | Footprint | References |
|---|---|---|---|
| 164 | FDV301N | Parts:SOT23_nmos | M1A1D, M1A2D, M1A3D, M1A4D, M1A5D, M1A6D, M1D, M1G, M1H, M1L2D, M1L4D, M1L5D, M1L6D, M1MAC, M10D, M11D +148 |
| 83 | 2k49 | Parts:R_0402_load | R0, R0DS, R0R, R0W, R1, R1DS, R1R, R1U6, R1W, R2, R2DS, R2R, R2U6, R2W, R3, R3DS +67 |
| 37 | NX3008PBK | Parts:SOT23_pmos | M0DS, M0R, M0W, M1BJ, M1BK, M1DS, M1P, M1R, M1W, M2DS, M2N2, M2N4D, M2N7D, M2NP, M2P, M2PP +21 |
| 21 | 820 | Parts:R_0402_strong | R1BJ, R1BK, R1D, R1P, R1S3D, R2BJ, R2BK, R2P, R2S3D, R3D, R4D, RL0S, RL1S, RL2D, RN0S, RN1S +5 |
| 12 | PDTC124TU | Parts:SOT23_bias | Q1BC, Q1BF0S, Q1BF1S, Q1BJ, Q1BK, Q1U6, Q2BC, Q2BF0S, Q2BF1S, Q2BJ, Q2BK, Q2U6 |
| 9 | RB751S40 | Parts:SOD523 | D0DS, D0W, D1DS, D1W, D2DS, D2W, D3DS, D3W, D4W |
| 2 | 1k5 | Parts:0603 | R8, R9 |
| 1 | ledgreen | Parts:0805-diode | D1 |
| 1 | ledred | Parts:0805-diode | D2 |
| 1 | unknown | Connector_PCBEdge:BUS_PCIexpress_x16 | JMAIN |
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Questions
How big is the Control board PCB?
It measures 84.3 × 8.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Control board use?
331 parts, built around the FDV301N, NX3008PBK, PDTC124TU and RB751S40. 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 Control board KiCad files?
From the rcls/discus repository on GitHub, at the commit this page was made from: the board is control-board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Control board 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).