Default
About the Default PCB
Default is an open source PCB design by cHemingway, published on GitHub. It is a 2-layer board measuring 78 × 60 mm, with 85 components from 37 distinct parts.
Other key parts include the SN74AHCT1G125DBVR, IB0505LS-1WR3, TLV75901PDRVR, ABM8-272-T3 and RP2354A. By type, the board carries 37 capacitors, 19 ICs, 19 resistors, 3 LEDs, 2 switches and 1 transistor.
It belongs with the power & battery designs in this gallery.
From the project
Tests of various "circuit as code" tools
An RP2354A USB interface that plugs straight into the 50-way SKB socket of a Solartron 7075 DVM fitted with the 70754 Parallel BCD Interface Unit (service manual, section 9). Every signal to and from the meter crosses an optical isolation barrier, so USB ground noise never reaches the meter's ground. SKB pin 37 is the meter's earth and logic 0.
Designed with atopile 0.15.9 (ato build). The parts come from atopile's package library where it had them, and from LCSC otherwise.
Main components on the Default
Default bill of materials (BOM)
85 components, 37 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SN74AHCT1G125DBVR RP2354A Texas Instruments | SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR | U1 |
| 1 | IB0505LS-1WR3 AP2112K-3.3 YLPTEC | PWRM-TH_BXXXXLS-1WR3 | U2 |
| 1 | TLV75901PDRVR USBLC6-2SC6 Texas Instruments | WSON-6_L2.0-W2.0-P0.65-TL-EP | U3 |
| 1 | ABM8-272-T3 78L05 Abracon LLC | CRYSTAL-SMD_4P-L3.2-W2.5-BL | U4 |
| 1 | RP2354A TLP2361 Raspberry Pi | QFN-60_L7.0-W7.0-P0.40-TL-EP3.4 | U5 |
| 4 | TLP2361(TPL,E TLP2361 TOSHIBA | OPTO-SMD-5_L3.7-W4.6-P1.27-LS7.0-BR | U6, U7, U8, U9 |
| 2 | TLP2361(TPL,E 74HCT165 TOSHIBA | OPTO-SMD-5_L3.7-W4.6-P1.27-LS7.0-BR | U10, U11 |
| 3 | CD74HCT165M96 74HCT165 Texas Instruments | SOIC-16_L9.9-W3.9-P1.27-LS6.0-BL | U12, U13, U14 |
| 2 | CD74HCT165M96 74HC595 Texas Instruments | SOIC-16_L9.9-W3.9-P1.27-LS6.0-BL | U15, U16 |
| 2 | 74HCT595D,118 Nexperia | SOIC-16_L9.9-W3.9-P1.27-LS6.0-BL | U17, U18 |
| 1 | BF 180 SHOU HAN | USB-B-TH_921-111A1010Y10201 | U19 |
| 1 | 2N7002 Jiangsu Changjing Electronics Technology Co., Ltd. | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q1 |
| 1 | DD50P364TXLF Amphenol ICC | CONN-TH_50P-P2.76_DD50P364TXLF | CN1 |
| 1 | 1206L050/36NR 500MA LUTE | F1206 | F1 |
| 1 | SKRPACE010 BOOTSEL ALPSALPINE | KEY-SMD_4P-L4.2-W3.2-P2.20-LS4.6 | SW1 |
| 1 | SKRPACE010 RESET ALPSALPINE | KEY-SMD_4P-L4.2-W3.2-P2.20-LS4.6 | SW2 |
| 2 | KT-0603G Hubei KENTO Elec | LED0603-RD | LED1, LED2 |
| 1 | KT-0603Y Hubei KENTO Elec | LED0603-R-RD | LED3 |
| 1 | USBLC6-2SC6 red STMicroelectronics | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | D4 |
| 1 | AOTA-B201610S3R3-101-T 3.3uH Abracon LLC | IND-SMD_L2.0-W1.6_AOTA-B201610S3R3-101-T | L1 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 26 | CL05B104KO5NNNC 100nF ±10% Samsung Electro-Mechanics | C0402 | C1, C7, C8, C9, C12, C13, C14, C15 +18 |
| 1 | CL21A475KAQNNNE 4.7µF ±10% Samsung Electro-Mechanics | C0805 | C2 |
| 2 | CL21A106KAYNNNE 10µF ±10% Samsung Electro-Mechanics | C0805 | C3, C37 |
| 2 | CL05A105KA5NQNC 1µF ±10% Samsung Electro-Mechanics | C0402 | C4, C5 |
| 1 | CL10A106KP8NNNC 10µF ±10% Samsung Electro-Mechanics | C0603 | C6 |
| 2 | 0402CG150J500NT 15pF ±5% FH | C0402 | C10, C11 |
| 3 | CL05A475MP5NRNC 4.7µF ±20% Samsung Electro-Mechanics | C0402 | C21, C22, C23 |
| 1 | 0402WGF3301TCE 3.3kΩ ±1% UNI-ROYAL | R0402 | R1 |
| 2 | 0402WGF1003TCE 100kΩ ±1% UNI-ROYAL | R0402 | R2, R18 |
| 1 | 0402WGF2002TCE 20kΩ ±1% UNI-ROYAL | R0402 | R3 |
| 2 | 0402WGF1001TCE 1kΩ ±1% UNI-ROYAL | R0402 | R4, R5 |
| 2 | 0402WGF1002TCE 10kΩ ±1% UNI-ROYAL | R0402 | R6, R10 |
| 2 | 0402WGF270JTCE 27Ω ±1% UNI-ROYAL | R0402 | R7, R8 |
| 1 | 0402WGF330JTCE 33Ω ±1% UNI-ROYAL | R0402 | R9 |
| 2 | 0402WGF6800TCE 680Ω ±1% UNI-ROYAL | R0402 | R11, R13 |
| 4 | 0402WGF3300TCE 330Ω ±1% UNI-ROYAL | R0402 | R12, R14, R15, R16 |
| 2 | 0402WGF1501TCE 1.5kΩ ±1% UNI-ROYAL | R0402 | R17, R19 |
Default design files
The KiCad project lives in the cHemingway/llm_circuitgen_tests repository on GitHub; these links point at the commit this page was built from.
Default: common questions
How big is the Default PCB?
The Default measures 78 × 60 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Default?
85 components, from 37 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 cHemingway/llm_circuitgen_tests 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 cHemingway. Use it as a reference, and ask the author before reusing the design.
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