Default
About the Default PCB
Default is an open source Raspberry Pi PCB design by jackalkahwati, published on GitHub. It is a 2-layer board measuring 1500 × 290 mm, with 180 components from 34 distinct parts.
Its main chip is the RaspberryPi_Pico_SMD_HandSolder, from the Raspberry Pi family. Other key parts include the 24AA025UIDT-I/OT, TPIC6B595DWR, TPS3823-33DBVR, TPS62086RLTR and TPS54331DR. By type, the board carries 91 relays, 35 ICs, 26 resistors, 17 diodes, 7 connectors and 2 inductors.
From the project
Electronics project for the FirstLight FL-1 custom board (architecture and requirements: relay-probe-matrix-rev-a.md in this directory).
Electronics project for the FirstLight FL-1 custom board (architecture and requirements: relay-probe-matrix-rev-a.md in this directory).
Mirrors github.com/jackalkahwati/resonant-computer/Tile-0/elec exactly:
1. atopile — schematics as code. elec/src/.ato modules compile to a KiCad netlist (ato build). Project config: ato.yaml. 2. KiCad 8 — layout in elec/layout/, ERC/DRC, custom design rules. 3. kicad-mcp — AI-driven placement/routing seeded by elec/layout/.kicad-mcp/projectspec.json (critical nets, analog island, placement intent, 160x100 mm 4-layer outline). 4. Output pipeline (as Tile-0…
Main components on the Default
Default bill of materials (BOM)
180 components, 34 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 24AA025UIDT-I/OT Microchip Tech | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | U1 |
| 1 | — | RaspberryPi_Pico_SMD_HandSolder | U2 |
| 12 | TPIC6B595DWR Texas Instruments | SOIC-20_L13.0-W7.6-P1.27-LS10.3-BL | U3, U4, U5, U6, U7, U8, U9, U10 +4 |
| 1 | TPS3823-33DBVR Texas Instruments | SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BL | U15 |
| 1 | TPS62086RLTR Texas Instruments | VSON-7_L2.0-W2.0-P0.5-TL | U16 |
| 1 | TPS54331DR Texas Instruments | SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL | U17 |
| 1 | INA219AIDCNR Texas Instruments | SOT-23-8_L3.0-W1.7-P0.65-LS2.8-BR | U18 |
| 1 | TPS7A4901DGNR Texas Instruments | HVSSOP-8_L3.0-W3.0-P0.65-LS4.9-BL-EP_DGN0008D | U19 |
| 8 | TLV3502AIDR Texas Instruments | SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL | U20, U22, U24, U26, U28, U30, U32, U34 |
| 8 | 0805L010YR Littelfuse | F0805 | U21, U23, U25, U27, U29, U31, U33, U35 |
| 1 | — | SEAF14 | J1 |
| 4 | — | PinHeader_1x02_P2.54mm_Vertical | J2, J3, J4, J7 |
| 1 | — | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | — | PinHeader_1x08_P2.54mm_Vertical | J6 |
| 64 | G6K-2F-Y-TR DC5 Omron Electronics | RELAY-SMD_G6K-2F-X-XX | K1, K2, K3, K7, K8, K9, K10, K11 +56 |
| 27 | SIP-1A05 PAN CHANG | RELAY-TH_SIP-1A05 | K4, K5, K6, K15, K16, K17, K26, K27 +19 |
| 1 | SMBJ33A Littelfuse | SMB_L4.6-W3.6-LS5.3-RD | D1 |
| 8 | BAV99,215 Nexperia | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | D2, D4, D6, D8, D10, D12, D14, D16 |
| 8 | SMAJ24CA Littelfuse | SMA_L4.4-W2.6-LS5.0-BI | D3, D5, D7, D9, D11, D13, D15, D17 |
| 1 | FTC252012S2R2MBCA L 2.2µH ±20% cjiang (Changjiang Microelectronics Tech) | IND-SMD_L2.5-W2.0_MHCHL2520 | L1 |
Show 14 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LQM18FN100M00D L 10µH ±20% Murata Electronics | L0603 | L2 |
| 1 | CC0603KRX7R9BB104 100nF ±10% YAGEO | C0603 | C1 |
| 1 | 0603B103K500NT 10nF ±10% FH(Guangdong Fenghua Advanced Tech) | C0603 | C2 |
| 1 | 0402WGF1002TCE 10kΩ ±1% UNI-ROYAL(Uniroyal Elec) | R0402 | R1 |
| 1 | FRC0603F1582TS 15.8kΩ ±1% FOJAN | R0603 | R2 |
| 9 | 0402WGF1003TCE 100kΩ ±1% UNI-ROYAL(Uniroyal Elec) | R0402 | R3, R9, R11, R13, R15, R17, R19, R21 +1 |
| 1 | 0603WAF2001T5E 2kΩ ±1% UNI-ROYAL(Uniroyal Elec) | R0603 | R4 |
| 1 | 0402WGF1052TCE 10.5kΩ ±1% UNI-ROYAL(Uniroyal Elec) | R0402 | R5 |
| 1 | FRC0603F2052TS 20.5kΩ ±1% FOJAN | R0603 | R6 |
| 1 | FRC0603F3572TS 35.7kΩ ±1% FOJAN | R0603 | R7 |
| 1 | 1206W3F500MT5E 50mΩ ±1% UNI-ROYAL(Uniroyal Elec) | R1206 | R8 |
| 8 | 0603WAF1004T5E 1MΩ ±1% UNI-ROYAL(Uniroyal Elec) | R0603 | R10, R12, R14, R16, R18, R20, R22, R24 |
| 1 | RT0603BRD071KL 1kΩ ±0.1% YAGEO | R0603 | R25 |
| 1 | ARG03BTC1003 100kΩ ±0.1% Viking Tech | R0603 | R26 |
Default design files
The KiCad project lives in the jackalkahwati/EE-lab repository on GitHub; these links point at the commit this page was built from.
Default: common questions
What microcontroller does the Default use?
The Default is built around the RaspberryPi_Pico_SMD_HandSolder, from the Raspberry Pi family.
How big is the Default PCB?
The Default measures 1500 × 290 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Default?
180 components, from 34 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 Default design files?
From the jackalkahwati/EE-lab repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Default design in my own project?
The repository has no license, so all rights stay with jackalkahwati. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Default without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.
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