2 layers90 × 97.5 mm
2 layers92 × 96 mm
Precond
liubo817/SPRO4- Size
- 92 × 96 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 49
- Nets
- 61
- Pads
- 176
- Tracks, vias
- 199, 91
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Feb 2026
- Updated
- 16 Jun 2026
Overview
Precond is an open-source printed circuit board by liubo817, from the liubo817/SPRO4 repository on GitHub. It is a 2-layer board of 92 × 96 mm with 49 parts on 61 nets, routed with 199 tracks and 91 vias.
It is built around the OPA2340PA, P6KE18CA and IRLML6344TRPBF, with the IRLML9301TRPBF among its other parts. Its parts include 9 capacitors, 8 resistors, 7 diodes, 5 connectors and 2 ICs. It belongs with the RP2040 boards of this library.
Main components
4
OPA2340PA
PDIP-8-40℃~+85℃ 0.2pA 0.2pA 150uV 2 2.5uV/℃ 2.7V~5.5V 25nV/√Hz@1kHz 5.5MHz 50mA 6V/us 750uA 80dB Rail-to-Rail Input, Rail-to-Rail Output PDIP-8 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
P6KE18CA
DO-15(DO-204AC)-55℃~+150℃ 15.3V 17.1V 1uA 24.2A 25.2V 600W@10/1000us Bidirectional TVS DO-15(DO-204AC) ESD and Surge Protection (TVS/ESD) ROHSBORNESD And Surge Protection (TVS/ESD)
IRLML6344TRPBF
SOT-23-55℃~+150℃ 1 N-channel 1.1V 1.3W 29mΩ@4.5V 30V 46pF 5A 6.8nC 650pF SOT-23 MOSFETs ROHSInfineon TechnologiesMOSFETsIRLML9301TRPBF
SOT-23-55℃~+150℃ 1 P-Channel 1.3W 2.4V 3.6A 30V 388pF 4.8nC@4.5V 64mΩ@10V SOT-23 MOSFETs ROHSInfineon TechnologiesMOSFETs
README
README.mdSPRO4
Parts
49| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C2, C3, C8, C9 |
| 5 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D3, D4, D5, D6, D7 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_2.5x2.5mm | TP3V3, TPCH1, TPCH2, TPOP1, TPOP2 |
| 4 | 200k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | Rf1, Rf2, Rg1, Rg2 |
| 3 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R4 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | Rs1, Rs2 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R5, R8 |
| 2 | 56k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3 |
| 2 | Conn_Coaxial | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J1, J2 |
| 2 | OPA2340 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U1, U2 |
| 2 | P6KE18CA | Diode_THT:D_DO-15_P10.16mm_Horizontal | D1, D2 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric | R6 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C5 |
| 1 | 1n | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 22 | Resistor_SMD:R_2512_6332Metric | R7 |
| 1 | 220uF | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C7 |
| 1 | 470uH | Inductor_THT:L_Radial_D10.0mm_P5.00mm_Fastron_07M | L1 |
| 1 | 47uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C4 |
| 1 | IRLML6344TRPBF | Package_TO_SOT_SMD:SOT-23-3 | Q1 |
| 1 | IRLML9301TRPBF | Package_TO_SOT_SMD:SOT-23-3 | Q2 |
| 1 | RaspberryPi_Pico | Module:RaspberryPi_Pico_Common_THT | A1 |
| 1 | Screw_Terminal_01x03 | TerminalBlock_MetzConnect:TerminalBlock_MetzConnect_Type011_RT05503HBLC_1x03_P5.00mm_Horizontal | J4 |
| 1 | UART_hdr | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | XADC_header | Connector_PinSocket_2.00mm:PinSocket_2x10_P2.00mm_Vertical | J3 |
More from liubo817/SPRO4
1Similar boards
- 2 layers100 × 100 mm
Control board
CoraBeanz/ROS-Optics-Bench
A mostly 3D-printed optical bench that couples a 635 nm laser into an optical fiber by itself. Knock a mirror out of line and four stepper-driven adjusters steer the beam back to peak coupling, with no hands on the…
31 parts2 - 2 layers123.5 × 112.1 mm
- 2 layers70 × 70 mm
Fwrtss
ynsta/fwrtss
Open source hardware and software project of a regulated soldering station for RT soldering tips
103 parts7 - 4 layers80.6 × 60.6 mm
Lorawan sensor node v2
ElektorLabs/lorawan-sensor-node-v2
Solar Powered LoRaWAN Sensor Node V2
84 parts1GPL-3.0 - 4 layers50 × 75 mm
- 2 layers108 × 75 mm
ESP32 C3 Zigbee Temp
Cath272/ESP32-Low-Power-Temp-Monitor
In the project files you may find ESP32-C3 instead of ESP32-C6. I named it wrong when i created the project. The issue is just the file names, the footprints are correct and use a C6.
75 partsGPL-3.0 - 2 layers15 × 25 mm
- 2 layers25.9 × 17.3 mm
SnapVCC
electronut/ElectronutLabs-snapVCC
A tiny 3.3 V / 5 V voltage regulator that snaps right on top of a 9 volt battery.
25 parts77
Questions
How big is the Precond PCB?
It measures 92 × 96 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Precond use?
49 parts, built around the OPA2340PA, P6KE18CA, IRLML6344TRPBF and IRLML9301TRPBF. 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 Precond KiCad files?
From the liubo817/SPRO4 repository on GitHub, at the commit this page was made from: the board is Hardware/precondV2/precond.kicad_pcb and its schematic Hardware/Input Module/precond_wip.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Precond design in my own project?
Its repository states no licence, so its author keeps all rights: ask liubo817 before reusing the design.