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2 layers85.8 × 94.2 mmFault Latch 2, the printed circuit board in 3D

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

Size
85.8 × 94.2 mm
Copper layers
2
Thickness
1.6 mm
Parts
123
Nets
76
Pads
340
Tracks, vias
610, 352
Pours
1
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
21 Jun 2025
Updated
21 Oct 2026

Overview

Fault Latch 2 is an open-source printed circuit board by LSUTigerRacing, from the LSUTigerRacing/Electronics repository on GitHub. It is a 2-layer board of 85.8 × 94.2 mm with 123 parts on 76 nets, routed with 610 tracks and 352 vias.

It is built around the SFH617A-1, SN74AHC1G08DBVR and SN74HC00N, with the 74LS279P-E, CD4027BE and LM1117DT-5.0 among its other parts. Its parts include 38 resistors, 20 capacitors, 17 transistors, 10 ICs and 9 diodes.

Main components

7

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

123
QtyValueFootprintReferences
12TestPointTestPoint:TestPoint_Pad_D1.5mmTP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12
11Q_NMOS_GSDPackage_TO_SOT_SMD:SOT-23Q3, Q4, Q105, Q106, Q112, Q113, Q114, Q115, Q117, Q118, Q120
1010kResistor_SMD:R_1210_3225MetricR1, R4, R7, R9, R12, R105, R114, R121, R123, R136
91kResistor_SMD:R_1210_3225MetricR2, R6, R8, R108, R111, R115, R120, R124, R129
70.1uCapacitor_SMD:C_0402_1005MetricC2, C3, C5, C6, C108, C112, C118
7100kResistor_SMD:R_1210_3225MetricR101, R110, R113, R119, R122, R127, R132
6Q_NPN_BECPackage_TO_SOT_SMD:SOT-23Q101, Q102, Q103, Q104, Q110, Q111
4LOGOLOGOG***, G***, G***, G***
4MountingHoleMountingHole:MountingHole_4.3mm_M4_DIN965_Pad_TopOnlyH101, H102, H103, H104
3100nCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC1, C116, C117
310nCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC101, C105, C106
3270RResistor_SMD:R_1210_3225MetricR3, R130, R150
32kResistor_SMD:R_1210_3225MetricR117, R128, R137
3510RResistor_SMD:R_1210_3225MetricR10, R13, R112
3Bi-TVS DiodeDiode_SMD:D_SOD-523D1, D2, D3
3D_SchottkyDiode_SMD:D_SMAD104, D108, D110
3REDLED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolderD102, D107, D109
3Relay_SPDT_Omron_G2RL-1Relay_THT:Relay_SPDT_Omron_G2RL-1K1, K2, K3
3SFH617A-1Package_DIP:DIP-4_W7.62mmU3, U5, U6
3SW_Omron_B3FSButton_Switch_SMD:SW_SPST_Omron_B3FS-100xPSW101, SW102, SW103
21uCapacitor_SMD:C_0402_1005MetricC4, C107
2SN74AHC1G08DBVRPackage_TO_SOT_SMD:SOT-23-5U7, U8
1.01uCapacitor_SMD:C_0402_1005MetricC109
10.33uCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC115
11053131202Connector_Molex:Molex_Nano-Fit_105313-xx02_1x02_P2.50mm_HorizontalJ4
110531413121.Custom:CONN_SD-105314-100_12_MOL_NanoJ1
11uCapacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC114
12.2kResistor_SMD:R_2512_6332MetricR5
122uCapacitor_SMD:C_0402_1005MetricC111
147uCapacitor_SMD:CP_Elec_6.3x5.4C113
14pinNanofitConnector_Molex:Molex_Nano-Fit_105313-xx04_1x04_P2.50mm_HorizontalJ2
15.6kResistor_SMD:R_1210_3225MetricR141
1680Resistor_SMD:R_1210_3225MetricR133
174HC00Package_DIP:DIP-14_W7.62mmU4
174LS279Package_DIP:DIP-16_W7.62mmU1
1CD4027BE1.Custom:DIP794W53P254L1930H508Q16NIC1
1LM1117DT-5.0Package_TO_SOT_SMD:TO-252-3_TabPin2U2
1LM555xMPackage_SO:SOIC-8_3.9x4.9mm_P1.27mmU118

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Questions

How big is the Fault Latch 2 PCB?

It measures 85.8 × 94.2 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Fault Latch 2 use?

123 parts, built around the SFH617A-1, SN74AHC1G08DBVR, SN74HC00N and 74LS279P-E. 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 Fault Latch 2 KiCad files?

From the LSUTigerRacing/Electronics repository on GitHub, at the commit this page was made from: the board is Fault Latch 2/Fault Latch 2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Fault Latch 2 design in my own project?

Its repository states no licence, so its author keeps all rights: ask LSUTigerRacing before reusing the design.