2 layers65.1 × 52.9 mm
2 layers85 × 85 mm
Precharge
FormulaBartonRacing/Electronics1Repo for 2026 circuit boards
- Size
- 85 × 85 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 39
- Pads
- 156
- Tracks, vias
- 413, 323
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Sep 2024
- Updated
- 19 Jun 2026
Overview
Precharge is an open-source printed circuit board by FormulaBartonRacing, from the FormulaBartonRacing/Electronics repository on GitHub. It is a 2-layer board of 85 × 85 mm with 67 parts on 39 nets, routed with 413 tracks and 323 vias.
It is built around the LM393, AO3400A and CJ2310, with the KT12-1A-40L-THT among its other parts. Its parts include 33 resistors, 6 diodes, 4 connectors, 3 capacitors and 3 ICs.
Main components
4
LM393
SOP-8-16V~16V 0℃~+70℃ 2 2.5mA 250nA 2V~36V 36V 5mV 5nA Fail-safe function Open-drain SOP-8 Comparators ROHSMSKSEMIComparators
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
CJ2310
SOT-23-3-40℃~+150℃ 1 N-channel 125mΩ@4.5V 19.5pF 247pF 350mW 3A 500mV 60V 6nC@10V SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETsKT12-1A-40L-THT
DIP,10.2x30.2mm-40℃~+100℃ 1 Set Normally Open: 1A (SPST NO) 12V 1A 1kV@AC、1kV@DC DIP,10.2x30.2mm Reed Relays ROHSSTANDEXMEDERReed Relays
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 75K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R19, R23, R26, R31, R33, R36 |
| 6 | 8.6K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R20, R24, R27, R32, R34, R37 |
| 5 | 18K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R17, R22, R29, R30, R35 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
| 3 | 3.3K | Resistor_SMD:R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R9, R11, R13 |
| 3 | TestPoint | Connector_Pin:Pin_D1.0mm_L10.0mm | TP1, TP2, TP3 |
| 2 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4 |
| 2 | 1.8K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16, R21 |
| 2 | 10K | Resistor_SMD:R_1206_3216Metric | R2, R3 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15, R18 |
| 2 | 1N4937 | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D4, D5 |
| 2 | 1n4937 | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D1, D2 |
| 2 | 330K | Resistor_SMD:R_1206_3216Metric | R1, R6 |
| 2 | 4N35 | Package_DIP:DIP-6_W7.62mm | U3, U4 |
| 2 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q2, Q3 |
| 2 | Conn_01x02 | Connector_Molex:Molex_Mini-Fit_Jr_5566-02A_2x01_P4.20mm_Vertical | J1, J2 |
| 1 | 1.5Meg | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R28 |
| 1 | 10uF | Capacitor_SMD:C_Elec_4x5.4 | C2 |
| 1 | 150 | Chassis_Resistor:HSA25 | R8 |
| 1 | 270 | Resistor_SMD:R_1206_3216Metric | R4 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14 |
| 1 | 7.5K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R25 |
| 1 | CJ2310 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_02x03_Counter_Clockwise | Connector_Molex:Molex_Micro-Fit_3.0_43045-0612_2x03_P3.00mm_Vertical | J4 |
| 1 | GLV- | Connector_Pin:Pin_D1.0mm_L10.0mm | TP6 |
| 1 | KT12-1A-40L-THT | Meder:RELAY_KT12-1A-40L-THT | K1 |
| 1 | LM393 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | LOGO | LOGO | G*** |
| 1 | Molex MicroFit | Connector_Molex:Molex_Micro-Fit_3.0_43045-0612_2x03_P3.00mm_Vertical | J3 |
| 1 | P_C LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | P_F LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D6 |
| 1 | Prech_Shut | Connector_Pin:Pin_D1.0mm_L10.0mm | TP7 |
| 1 | RKZE-1205S_HP | Recom DC-DC:CONV_RKZE-1205S_HP | PS1 |
| 1 | R_Potentiometer_Trim | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | TestPoint P_C | Connector_Pin:Pin_D1.0mm_L10.0mm | TP5 |
The 66 most common of 67 parts.
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Questions
How big is the Precharge PCB?
It measures 85 × 85 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Precharge use?
67 parts, built around the LM393, AO3400A, CJ2310 and KT12-1A-40L-THT. 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 Precharge KiCad files?
From the FormulaBartonRacing/Electronics repository on GitHub, at the commit this page was made from: the board is Precharge/Precharge.kicad_pcb and its schematic BSPD/BSPD.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Precharge design in my own project?
Its repository states no licence, so its author keeps all rights: ask FormulaBartonRacing before reusing the design.