2 layers110 × 60 mm
Arduino Spot Welder
KaeptnBalu/Arduino_Spot_Welder_V3
This is the Kicad project for V3.1 The Arduino Board was not changed, only the Mosfet Board got a updgrade.
74 parts207GPL-3.0
2 layers115 × 77 mm
Arduino Spot Welder
KaeptnBalu/Arduino_Spot_Welder_V4108This is V4 of the Arduino Spot Welder. An Arduino based Spot Welder for battery welding
- Size
- 115 × 77 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 46
- Pads
- 235
- Tracks, vias
- 833, 431
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 2 Mar 2021
- Updated
- 12 May 2026
Overview
Arduino Spot Welder is an open-source printed circuit board by KaeptnBalu, from the KaeptnBalu/Arduino_Spot_Welder_V4 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 115 × 77 mm with 67 parts on 46 nets, routed with 833 tracks and 431 vias.
It is built around the MCP1407-E/P, FDB0105N407L and SLD8S14A, with the SMAJ13A among its other parts. Its parts include 11 resistors, 7 capacitors, 7 connectors, 4 diodes and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
4
MCP1407-E/P
PDIP-8-40℃~+150℃ 1 130uA 20ns 20ns 4.5V~18V 6A 6A MOSFET PDIP-8 Gate Drivers ROHSMicrochip TechnologyGate Drivers
FDB0105N407L
TO-263-7-55℃~+175℃ 0.8mΩ@10V 1 N-channel 1.365nF 2.8V 23.1nF 291nC@10V 300W 40V 460A 5.335nF N-Channel ±20V TO-263-7 MOSFETs ROHSonsemiMOSFETs
SLD8S14A
SMTO-263-55℃~+175℃ 10uA 14V 15.6V 23.2V 301A 7kW@10/1000us IEC 61000-4-2、IEC 61000-4-4 TVS Unidirectional SMTO-263 ESD and Surge Protection (TVS/ESD) ROHSLittelfuseESD And Surge Protection (TVS/ESD)
SMAJ13A
DO-214AC(SMA)-55℃~+150℃ 13V 15.9V 18.6A 1uA 21.5V 400W@10/1000us IEC 61000-4-2 TVS Unidirectional DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
README
KiCAD_PCB_Files/KiCAD_Project/README.mdThese are the KICAD project files for the Arduino Spot Welder V4
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistors_SMD:R_0805_HandSoldering | NTC1, R1, R2, R3, R4, R5, R7, R11 |
| 6 | 30 | Resistors_SMD:R_1206_HandSoldering | R13, R14, R15, R16, R17, R18 |
| 6 | FDB0105N407L | TO_SOT_Packages_SMD:TO-263-6 | T1, T2, T3, T4, T5, T6 |
| 4 | 10nF | Capacitors_SMD:C_0805_HandSoldering | C1, C5, C6, C7 |
| 3 | 1k | Resistors_SMD:R_0805_HandSoldering | R6, R8, R9 |
| 3 | SLD8S14A | pots_own:SMTO-263 | TVS3, TVS4, TVS5 |
| 2 | 470µF | Capacitors_SMD:CP_Elec_10x10 | C3, C4 |
| 2 | AutoPulse | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | P5, P7 |
| 2 | CONN_01X06 | Pin_Headers:Pin_Header_Straight_1x06_Pitch2.54mm | Mosfet_CTRL1, Mosfet_CTRL2 |
| 2 | D_Schottky_BAV99 | TO_SOT_Packages_SMD:SOT-23 | D2, D4 |
| 2 | GND_con | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | P4, P6 |
| 2 | SMAJ13A | Diodes_SMD:D_SMA | TVS1, TVS2 |
| 1 | 1µF | Capacitors_ThroughHole:C_Disc_D7.5mm_W5.0mm_P5.00mm | C2 |
| 1 | 3k3 | Resistors_SMD:R_0805_HandSoldering | R12 |
| 1 | 620 | Resistors_SMD:R_0805_HandSoldering | R10 |
| 1 | Bourns_PEC11L | Rotary-Encoders:ALPS_STEC12E08 | ENC1 |
| 1 | CONN_01X02 | Connectors_Molex:Molex_KK-6410-02_02x2.54mm_Straight | Foot_Switch1 |
| 1 | D | Diodes_SMD:D_SMA | D1 |
| 1 | MCP1407 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | P2 |
| 1 | MMBT3904-7-F | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | OLED_Display | OLED_SSD1306:OLED_SSD1306_128x64 | P3 |
| 1 | SPEAKER | pots_own:Buzzer_PS1240P02BT | SP1 |
| 1 | V IN | pots_own:Terminal_Block_2P_3.5mm | P1 |
| 1 | ZENER | Diodes_SMD:D_SOD-123 | D3 |
| 1 | arduino_nano | arduino:arduino_mini | U1 |
The 55 most common of 67 parts.
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Questions
How big is the Arduino Spot Welder PCB?
It measures 115 × 77 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Arduino Spot Welder use?
67 parts, built around the MCP1407-E/P, FDB0105N407L, SLD8S14A and SMAJ13A. 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 Arduino Spot Welder KiCad files?
From the KaeptnBalu/Arduino_Spot_Welder_V4 repository on GitHub, at the commit this page was made from: the board is KiCAD_PCB_Files/KiCAD_Project/Arduino_Spot_Welder.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Arduino Spot Welder design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).