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2 layers133 × 98 mmPrecharge, the printed circuit board in 3D

This repository contains all of the KiCad Schematics for the 2026 TigerRacing Formula SAE's Electronics Subsystem.

Size
133 × 98 mm
Copper layers
2
Thickness
1.6 mm
Parts
121
Nets
95
Pads
350
Tracks, vias
1,653, 32
Pours
4
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
21 Jun 2025
Updated
21 Oct 2026

Overview

Precharge is an open-source printed circuit board by LSUTigerRacing, from the LSUTigerRacing/Electronics repository on GitHub. It is a 2-layer board of 133 × 98 mm with 121 parts on 95 nets, routed with 1,653 tracks and 32 vias.

It is built around the SPAN02A-12, TJA1051T/3/1 and LM2904, with the LM1117-5.0, LM393 and BZX84C12 among its other parts. Its parts include 49 resistors, 23 capacitors, 12 diodes, 11 ICs and 3 transistors. It belongs with the NXP (LPC, Kinetis, i.MX RT) boards of this library.

Main components

10

README

README.md
TigerRacing Logo


This repository contains all of the KiCad Schematics for the TigerRacing Formula SAE's Electronics Subsystem.

Prerequisites

Board Templates

When making a new PCB, if the board is to be manufactured by JLCPCB. import the corresponding board constraints from Board Templates/JLC

Getting Started

This section will walk you through downloading the repository to your computer for the first time. You only need to do this once.

1. Generate a GitHub Token

A token is essentially a password that lets Git on your computer talk to GitHub securely.

  1. Log into GitHub
  2. Click your profile picture → Settings
  3. Scroll down and click Developer settings (bottom of the left sidebar)
  4. Click Personal access tokens → Tokens (classic)
  5. Click Generate new token (classic)
  6. Give it a name (e.g. git-access), set an expiration, and check the repo scope
  7. Click Generate token and copy it — you won't be able to see it again!

2. Clone the Repository

"Cloning" means downloading a full copy of the repository to your computer.

Open Git Bash and run the following commands one at a time:

sh
git clone https://github.com/LSUTigerRacing/Electronics.git
cd Electronics

When prompted for a password, paste the token you copied in the previous step.

3. Open the Project in KiCad

In Git Bash, highlight and right-click Electronics to open the folder in File Explorer. From there, open the KiCad project file (.kicad_pro).


Contributing

This section covers the full workflow for making changes and submitting them every time you work on something.

[!IMPORTANT] Never commit directly to main. All changes must go through a pull request.

Step 1 — Make sure you're up to date

Before starting any work, pull the latest changes from the repository so you're not working on an outdated copy.

sh
cd Electronics
git pull origin main

Step 2 — Create a branch

A "branch" is your own isolated workspace. Think of it like making a photocopy of the project — you make your edits on the copy, and only merge it back once everything looks good.

Replace your-branch-name with something descriptive (e.g. fault-latch-rework).

sh
git checkout -b "your-branch-name"

Step 3 — Make your edits

Open the KiCad project and make your changes. Save your work when done.

Step 4 — Stage and commit your changes

"Staging" tells Git which files to include, and "committing" saves a snapshot of those changes with a description.

sh
git add .
git commit -m "Brief description of what you changed"

Step 5 — Push your branch to GitHub

"Pushing" uploads your local branch so others (and GitHub) can see it.

sh
git push -u origin "your-branch-name"

Step 6 — Open a Pull Request

  1. Go to the repository on GitHub
  2. Click the Pull requests tab
  3. Click New pull request
  4. Set the base branch to main and the compare branch to yours
  5. Give it a clear title and description of what you changed
  6. Click Create pull request

A reviewer will look over your changes. Once approved, your branch will be merged into main and can then be deleted.


PCB Gallery

Fault Latch

FaultLatch

Parts

121
QtyValueFootprintReferences
13100nCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC1, C2, C11, C12, C15, C16, C17, C18, C19, C20, C21, C22, C23
10510kResistor_SMD:R_1206_3216MetricR31, R32, R33, R34, R36, R37, R38, R40, R41, R42
710kResistor_SMD:R_1206_3216MetricR8, R21, R27, R29, R44, R45, R48
6MountingHole_3.2mm_M3MountingHole:MountingHole_3.2mm_M3MT1, MT2, MT3, MT4, MT5, MT6
6TestPointTestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm_LowProfileTP1, TP2, TP3, TP4, TP5, TP6
5DDiode_SMD:D_SMAD1, D7, D8, D9, D12
4100kResistor_SMD:R_1206_3216MetricR20, R22, R25, R28
41uCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC3, C8, C9, C10
4200Resistor_SMD:R_1206_3216MetricR2, R3, R4, R5
4220uCapacitor_SMD:C_Elec_6.3x5.4C4, C5, C6, C7
46k8Resistor_SMD:R_1206_3216MetricR7, R10, R23, R24
4LEDLED_SMD:LED_0805_2012Metric_CastellatedD2, D3, D4, D5
312kResistor_SMD:R_1206_3216MetricR13, R17, R26
34N35Package_DIP:SMDIP-6_W7.62mmU5, U6, U11
3SolderJumper_2_OpenJumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mmJP1, JP2, JP3
210nCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC13, C14
21k5Resistor_SMD:R_1206_3216MetricR11, R12
220kResistor_SMD:R_1206_3216MetricR6, R9
2220Resistor_SMD:R_1206_3216MetricR19, R47
22N7002Package_TO_SOT_SMD:SOT-23Q1, Q3
239kResistor_SMD:R_1206_3216MetricR39, R43
247Resistor_SMD:R_1206_3216MetricR14, R16
2560Resistor_SMD:R_1206_3216MetricR15, R18
2BZX84C12Package_TO_SOT_SMD:SOT-23D10, D11
2LM331Package_DIP:DIP-8_W7.62mmU7, U8
10Resistor_SMD:R_1206_3216MetricR49
1160Resistor_SMD:R_1206_3216MetricR1
12k2Resistor_SMD:R_1206_3216MetricR35
1447690401Precharge:MICROFIT-4PINJ3
1500kResistor_SMD:R_1206_3216MetricR30
1BZX84C3V3Package_TO_SOT_SMD:SOT-23D6
1G7L-2A-X-LPrecharge:G7L-2A-X-LK2
1HSA253K3JPrecharge:Chassis_Resistor_TE_Connectivity_HSA25R46
1LM1117-5.0Package_TO_SOT_SMD:SOT-223-3_TabPin2U4
1LM2904Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU9
1LM393Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU10
1LOGOPrecharge:electric-shock-symbolG***
1LOGOPrecharge:logoG***
1MMBT3906Package_TO_SOT_SMD:SOT-23Q2
1MicroFitConnector_Molex:Molex_Micro-Fit_3.0_43045-0812_2x04_P3.00mm_VerticalJ1
1Mini-Fit_Jr_5566-04APrecharge:MICROFIT-4PINJ2
1OMRON-G2RL-24Precharge:OMRON-G2R-24K1
1SPAN02A-12Precharge:DC-DCSPAN02W8-12U2
1TFPT1206L1002FMResistor_SMD:R_1206_3216MetricTH1
1TJA1051T-3Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU1
1Teensy4.0teensy:Teensy40U3

Questions

How big is the Precharge PCB?

It measures 133 × 98 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Precharge use?

121 parts, built around the SPAN02A-12, TJA1051T/3/1, LM2904 and LM1117-5.0. 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 LSUTigerRacing/Electronics repository on GitHub, at the commit this page was made from: the board is PrechargeDischarge/Precharge26/Precharge.kicad_pcb. 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 LSUTigerRacing before reusing the design.

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