2 layers74.5 × 75 mm Untitled copy, the printed circuit board in 3D

Untitled copy

Small PCB Board using LEDs

Size: 74.5 × 75 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 23
Nets: 16
Pads: 54
Tracks, vias: 123, 3
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 25 Mar 2026
Updated: 4 Apr 2026

Overview

Untitled copy is an open-source printed circuit board by Wjchou2, from the Wjchou2/LEDSmile repository on GitHub. It is a 2-layer board of 74.5 × 75 mm with 23 parts on 16 nets, routed with 123 tracks and 3 vias.

Its parts include 8 resistors, 4 capacitors, 4 diodes, 4 transistors and 2 switches.

README

README.md

LEDSmile

This project uses Capacitors, Resistors and Transistors to blink 4 LEDs in a loop. The buttons start the blinking! Use the 2 pin Connection header to connect to power. To use, simplfy click the first switch the turn on the power, and the other switch the start the blinking of t he 4 LEDs I made this to learn basic circutry and KiCad!

Circut Demo

Live Circut demo here!

Screen Recording 2026-03-24 at 5 08 52 PM

Schematic

Routed PCB

Project files

Show this board on your page

https://pcbkit.io/boards/Wjchou2/LEDSmile

The board's own page, for a message or a post.

Source

Repository: Wjchou2/LEDSmile
Board file: src/kicad/Untitled copy.kicad_pcb
Commit: 92b9c3e
Licence: Not stated

Parts

Qty	Value	Footprint	References
4	1k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R2, R3, R6, R7
4	21uF	Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm	C1, C2, C3, C4
4	LED	LED_THT:LED_D5.0mm	D1, D2, D3, D4
4	Q_NPN_BCE	Package_TO_SOT_THT:TO-92L_Inline_Wide	Q1, Q2, Q3, Q4
2	SW_Push	Button_Switch_THT:SW_PUSH_6mm	SW1, SW2
1	300	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R8
1	310	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R5
1	320	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R4
1	330	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R1
1	Conn_01x02	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J1

Similar boards

2 layers65 × 56 mm
Pi servo hat
earthtojake/text-to-cad
Design physical products with AI
23 parts26kMIT
2 layers14 × 100 mm
Yunomi
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
23 parts3kApache-2.0
2 layers50.8 × 52.2 mm
Fuhhni
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
23 parts915
2 layers138.8 × 89.8 mm
Keyboard pcb
diepala/cantor
Cantor keyboard, a 42 key diodeless split keyboard.
23 parts756GPL-3.0
2 layers32.9 × 53.3 mm
Goatgdo
Kaldek/rat-ratgdo
Open source schematics for ratgdo PCB
23 parts511MIT
2 layers35.5 × 50 mm
Tobo
kelu124/echomods
Open source ultrasound processing modules and building blocks
23 parts463
2 layers19 × 19 mm
Keybit
notaroomba/keybytes
A truly modular keyboard
23 parts444
2 layers88.5 × 28 mm
ExpBreakout
Duet3D/Duet-2-Hardware
The KiCAD source for the Duet 3d printer controller see www.duet3d.com
23 parts258

Questions

How big is the Untitled copy PCB?

It measures 74.5 × 75 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Untitled copy use?

23 parts. 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 Untitled copy KiCad files?

From the Wjchou2/LEDSmile repository on GitHub, at the commit this page was made from: the board is src/kicad/Untitled copy.kicad_pcb and its schematic src/kicad/Untitled copy.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Untitled copy design in my own project?

Its repository states no licence, so its author keeps all rights: ask Wjchou2 before reusing the design.