4 layers100 × 100 mm Fonemec, the printed circuit board in 3D

Fonemec

High power 2 Channel Sim racing seat belt tensioner

Size: 100 × 100 mm
Copper layers: 4
Thickness: 1.64 mm
Parts: 120
Nets: 171
Pads: 449
Tracks, vias: 1,272, 119
Pours: 26
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 2 Jun 2025
Updated: 11 Jun 2025

Overview

Fonemec is an open-source printed circuit board by JavaScythe, from the JavaScythe/foc repository on GitHub. It is a 4-layer board of 100 × 100 mm with 120 parts on 171 nets, routed with 1,272 tracks and 119 vias.

It is built around the DRV8323SRTAT, AP2112K-3.3 and TPD2EUSB30DRT, with the CSD19536KCS and PESD5V0S1BA among its other parts. Its parts include 45 resistors, 35 capacitors, 12 transistors, 11 connectors and 6 ICs. It belongs with the STM32 boards of this library.

Main components

README

README.md

foc

Hyper realistic two-channel sim racing seatbelt tensioner with two 48V 54+54A FOC motors and controller that blows commercial 1300$ solutions out of the water

Specifically, it is high torque low latency that comes with its own software with support for real dynamic frequency effects for haptic feedback

PLEASE see JOURNAL.md

Why?

HackClub's great initiative highway: not just "free money" but a nice community of beginners and advanced that help each other
Lack of respect for realism in sim racing: All too often "immersion" devices are just smoke and mirrors to generate profit, lacking careful design for realism, and the community defends this.
Vastly overpriced consumer solutions: Really? 1300$ for something that can be surpassed by a consumer with 350$?
Fun but complex to build toy: Using the rig is fun, but building stuff for it is better

Pictures

BOM

Name	Quantity	Price Total	Link
ODrive3.6 56V	1	60$	alibaba.com/product-detail/ODrive3-6-FOC-BLDC-Servo-Dual_1601406724288.html
S70BL146-430	2	120$	alibaba.com/product-detail/S70BL146-430-Brushless-Dc-Motor-High_1600943342358.html
4 Point Belt	1	19$	aliexpress.us/item/3256807037196658.html
2kw 40A 48V PSU	1	100$	alibaba.com/product-detail/High-Quality-2000W-48V-41-6A_1600901714728.html
SimHub License+Motion License	1	45€	simhubdash.com/simhub-motion-addon-licence/

Category and platform

STM32

Project files

Show this board on your page

https://pcbkit.io/boards/JavaScythe/foc

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

Source

Repository: JavaScythe/foc
Board file: pcb/fonemec.kicad_pcb
Commit: 359c6c4
Licence: Not stated

Parts

120

Qty	Value	Footprint	References
12	2	Resistor_SMD:R_0603_1608Metric	R19, R20, R22, R24, R25, R27, R37, R38, R39, R40, R41, R42
12	CSD19536KCS	0548190519:TO254P1036X470X1965-3	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12
8	22	Resistor_SMD:R_0603_1608Metric	R7, R8, R15, R16, R17, R28, R31, R35
6	100	Resistor_SMD:R_0603_1608Metric	R11, R12, R13, R14, R29, R36
6	1nF	Capacitor_SMD:C_0603_1608Metric	C15, C16, C17, C18, C19, C20
6	R_Shunt	WSK1216:RES_WSK12161L000FEA	R21, R23, R26, R43, R44, R45
5	100K	Resistor_SMD:R_0603_1608Metric	R1, R2, R3, R4, R5
5	10K	Resistor_SMD:R_0603_1608Metric	R18, R32, R33, R34, R46
4	10 µF X7R	Capacitor_SMD:C_0603_1608Metric	C3, C5, C8, C12
4	22uf Ceramic MLCC X7R	Capacitor_SMD:C_0603_1608Metric	C14, C22, C33, C36
2	0.1uf Ceramic MLCC X7R	Capacitor_SMD:C_0603_1608Metric	C34, C35
2	10 0nF	Capacitor_SMD:C_0603_1608Metric	C6, C10
2	1 µF	Capacitor_SMD:C_0603_1608Metric	C9, C11
2	22pF	Capacitor_SMD:C_0603_1608Metric	C1, C2
2	DRV8323SRTAT	DVR8323S:QFN50P600X600X80-41N415X415	U7, U8
2	TPGND	TestPoint:TestPoint_Pad_D2.0mm	TP4, TP7
2	X7R 0.1uF 6.3V	Capacitor_SMD:C_0603_1608Metric	C25, C30
2	X7R 1uF 16V	Capacitor_SMD:C_0603_1608Metric	C26, C28
2	X7R 1uF 6.3V	Capacitor_SMD:C_0603_1608Metric	C24, C27
2	X7R 47nF >48V	Capacitor_SMD:C_0603_1608Metric	C23, C29
1	0.1uF	Capacitor_SMD:C_0603_1608Metric	C4
1	01x02 48V	Connector:JWT_A3963_1x02_P3.96mm_Vertical	J4
1	01x04 SWD	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J1
1	01x04 USART	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J2
1	1.5K	Resistor_SMD:R_0603_1608Metric	R9
1	1K	Resistor_SMD:R_0603_1608Metric	R6
1	1M	Resistor_SMD:R_0603_1608Metric	R10
1	1 nF	Capacitor_SMD:C_0603_1608Metric	C13
1	8Mhz	Crystal:Crystal_DS26_D2.0mm_L6.0mm_Vertical	Y1
1	AP2112K-3.3	Package_TO_SOT_SMD:SOT-23-5	U3
1	ASMD050-2	Fuse:Fuse_Bourns_MF-RG400	F1
1	Conn_01x03_Pin	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J8
1	Low-ESR polymer electrolytic 470uF 63V	Capacitor_THT:CP_Radial_D12.5mm_P5.00mm	C7
1	Motor 1 Phase A	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J5
1	Motor 1 Phase B	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J6
1	Motor 1 Phase C	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J7
1	Motor 2 Phase A	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J9
1	Motor 2 Phase B	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J10
1	Motor 2 Phase C	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J11
1	PESD5V0S1BA	Diode_SMD:D_SOD-523	D1
1	PTPS7A0218PDQNR	TPS7A02:DQN0004A-MFG	U4
1	STM32F405VGTx	Package_QFP:LQFP-100_14x14mm_P0.5mm	U1
1	TP1SOA	TestPoint:TestPoint_Pad_D2.0mm	TP1
1	TP1SOB	TestPoint:TestPoint_Pad_D2.0mm	TP2
1	TP1SOC	TestPoint:TestPoint_Pad_D2.0mm	TP3
1	TP2SOA	TestPoint:TestPoint_Pad_D2.0mm	TP8
1	TP2SOB	TestPoint:TestPoint_Pad_D2.0mm	TP6
1	TP2SOC	TestPoint:TestPoint_Pad_D2.0mm	TP5
1	TPD2EUSB30	Package_TO_SOT_SMD:Texas_DRT-3	U5
1	USB_B_Mini	Keebio-Parts:USB-Mini-B_2leg	J3
1	X7R 0.1uF >63V	Capacitor_SMD:C_0603_1608Metric	C32
1	X7R 22uF >63V	Capacitor_SMD:C_0603_1608Metric	C31

Similar boards

6 layers300 × 220 mm
AIPE Buck 1kW
FulongLi/AIPE-PCB-Agent
AIPE-PCB-Agent is the PCB design automation of the AIPE power-electronics ecosystem. Python generators turn a requirement file set (specification, insulation table, components, interfaces, floorplan and routing inputs)…
240 parts
4 layers80 × 41.8 mm
Simple ESC
bluefeng2/Simple-ESC
Single motor ESC based on AM32
37 parts
4 layers54.5 × 40.8 mm
ESC
Kenmaa13/ELECTRONIC-SPEED-CONTROLLER
Making my own ESC from scratch
57 parts
2 layers116.5 × 80.8 mm
Crumbs drv8323
ahsanu123/crumbs
🍪 Crumbs - Collection of my DIY Electronic Module
37 partsMIT
4 layers76 × 50 mm
Wigglecam
jadenrhee/wigglecam-controller
RP2040 co-processor board for a 4-lens wigglegram camera: constant-current flash, controls, battery telemetry, Pi 5 I2C interface. 4-layer, DRC-clean, fab-ready.
105 parts
4 layers73.6 × 59.8 mm
Leak sensor v1
lewipewi/leakwatch
A multi-channel leak sensor for equipment enclosures. Instead of reporting "wet / dry" like a normal leak probe, it measures how wet each enclosure is, on a separate channel per enclosure, and carries a second circuit…
90 parts
4 layers75 × 70 mm
Small Pendant
mjhaahr/RGB-LED-Pendant
Small RGB LED Pendant using 1010 (1.0x1.0mm) WS2812B LEDs powered by an ESP32-C3 Mini with a BNO055 IMU
260 parts2MIT
4 layers51.6 × 37.8 mm
Port sprite
Batterhead221/port_sprite
Compact USB-C to UART debug/programming interface for embedded hardware projects.
34 parts

Questions

How big is the Fonemec PCB?

It measures 100 × 100 mm and has 4 copper layers, 1.64 mm thick.

What parts does the Fonemec use?

120 parts, built around the DRV8323SRTAT, AP2112K-3.3, TPD2EUSB30DRT and CSD19536KCS. 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 Fonemec KiCad files?

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

Can I use the Fonemec design in my own project?

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