2 layers34.5 × 35.8 mm LED Dimmer, the printed circuit board in 3D

LED Dimmer

Schematic and PCB layout for a dumb 5-12V LED dimming circuit, capable of 2- 99% PWM-based dimming.

Size: 34.5 × 35.8 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 27
Nets: 16
Pads: 57
Tracks, vias: 82, 55
Pours: 2
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 15 Jul 2025
Updated: 21 Aug 2025

Overview

LED Dimmer is an open-source printed circuit board by RossPorter506, from the RossPorter506/LED_Dimmer repository on GitHub. It is a 2-layer board of 34.5 × 35.8 mm with 27 parts on 16 nets, routed with 82 tracks and 55 vias.

It is built around the ZXTR2012Z-7, 1N4148W and PJA3404A_R1_00001, with the SS0520_R1_00001 among its other parts. Its parts include 3 capacitors, 3 diodes, 2 resistors, 2 ICs and 2 connectors.

Main components

README

README.md

LED_Dimmer

Schematic and PCB layout for a dumb 5-12V LED dimming circuit, capable of 2-99% PWM-based dimming.

No MCUs, no intelligent internet-connected devices, just a good old fashioned analog PWM dimmer using a 555 timer and a potentiometer.

Parts

Qty	Value	Footprint	References
4	54-00166	Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal	J_LED1, J_LED2, J_PS1, J_PS2
4	LOGO	LOGO	G1_F, G1_F, G1_R, G2_R
4	MountingHole_Pad	MountingHole:MountingHole_2.2mm_M2_Pad	MH1, MH2, MH3, MH4
2	100nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C1, C3
2	1N4148W	Diode_SMD:D_SOD-123	D1, D2
2	2.54mm Header	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J1, J2
1	10K	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1
1	1K	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2
1	200pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C2
1	PJA3404A_R1_00001	Package_TO_SOT_SMD:SOT-23-3	Q1
1	PTV09A-4020S-A105	Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical	PT1
1	SS0520_R1_00001	Diode_SMD:D_SOD-123	D3
1	SolderJumper_2_Open	Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm	JP1
1	TLC555CDR	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U1
1	ZXTR2012Z	Package_TO_SOT_SMD:SOT-89-3	U2

Questions

How big is the LED Dimmer PCB?

It measures 34.5 × 35.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the LED Dimmer use?

27 parts, built around the ZXTR2012Z-7, 1N4148W, PJA3404A_R1_00001 and SS0520_R1_00001. 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 LED Dimmer KiCad files?

From the RossPorter506/LED_Dimmer repository on GitHub, at the commit this page was made from: the board is LED_Dimmer.kicad_pcb and its schematic LED_Dimmer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the LED Dimmer design in my own project?

Its repository states no licence, so its author keeps all rights: ask RossPorter506 before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/rossporter506-led-dimmer" title="LED Dimmer in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/rossporter506-led-dimmer.jpg" alt="LED Dimmer" width="1200" height="900">

A picture that opens the board, for a README

[![LED Dimmer](https://pcbkit.io/embed/boards/rossporter506-led-dimmer.jpg?size=s)](https://pcbkit.io/boards/rossporter506-led-dimmer)

Source

Repository: RossPorter506/LED_Dimmer
Board file: LED_Dimmer.kicad_pcb
Commit: 0f95f99
Licence: Not stated

Similar boards

2 layers45 × 45 mm
Motor
mkramar/dizzyrobot

103 parts13
2 layers40 × 20 mm
B E PAPER DRIVER 24 PINS BRK R1.0
Boardoza/Boardoza_E_Paper_Driver_24_Pin_E_Paper_Display_Driver_Breakout_Board
E-Paper Driver 24 Pin is a compact low-power E-Paper display driver breakout board with integrated voltage booster and SPI interface.
25 partsCC-BY-SA-4.0
4 layers40.9 × 60.1 mm
Pcb hat
NCSU-High-Powered-Rocketry-Club/airbrakes-pi-hat
Custom made Pi hat for use in Airbrakes
78 partsMIT
4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers208.8 × 396.9 mm
Ferris
pierrechevalier83/ferris
A low profile split keyboard designed to satisfy one single use case elegantly
145 parts1.3k
2 layers285.5 × 95 mm
Reviung46 ver1 1
gtips/reviung
The REVIUNG41 is 41-key column staggered keyboard.
119 parts517MIT
4 layers95.6 × 73.6 mm
Mathpad
Summa-Cogni/Mathpad
A mathematical keypad for students and professionals
93 parts243
2 layers141.5 × 83 mm
Rolio
MickiusMousius/Rolio46Keyboard
A split wireless keyboard based on the Corne and Sofle
110 parts236MIT