2 layers44 × 72 mm Eda, the printed circuit board in 3D

Eda

open hardware clone of sony's 1998 dancing headphone pet

Size: 44 × 72 mm
Copper layers: 2
Thickness: 1.62 mm
Parts: 86
Nets: 46
Pads: 238
Tracks, vias: 459, 108
Pours: 4
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 21 May 2025
Updated: 20 Oct 2026

Overview

Eda is an open-source printed circuit board by rcyaon, from the rcyaon/funbbit repository on GitHub. It is a 2-layer board of 44 × 72 mm with 86 parts on 46 nets, routed with 459 tracks and 108 vias.

It is built around the STM32U083KCU6, SJ-3523-SMT-TR and 3034TR, with the AYF531035, DMP2045U-7 and FTSH-105-01-L-DV-K-A-P-TR among its other parts. Its parts include 23 capacitors, 22 resistors, 4 connectors, 4 switches and 2 ICs. It belongs with the audio and music boards and the STM32 boards of this library.

Main components

README

README.md

Funbbit

A modern recreation of the Sony PET-F7 "Funbbit" (1998): a virtual-pet accessory for a Walkman (or any 3.5 mm player). It sits inline between the player and the headphones, taps the audio without disturbing it, and animates a pet on a 1.28" Sharp monochrome memory LCD. The pet dances while music plays ("dancing pet", "weight battle") and gets fat when it does not. An STM32U083 runs everything from a single CR2032 coin cell.

Renders

Funbbit PCB, isometric view

Top	Bottom

44 x 72 mm, 2 layers, black mask, white silkscreen. The Sharp LCD (fitted by hand into J4) and the CR2032 cell are not shown.

Pixel art

Pet sprites are drawn in Aseprite.

Parts

Qty	Value	Footprint	References
16	TestPoint_Small	stdlib_kicad-footprints_TestPoint:TestPoint_Pad_D1.5mm	TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19
6	100k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R12, R13, R14, R15, R16, R17
5	Fiducial	stdlib_kicad-footprints_Fiducial:Fiducial_1mm_Mask2mm	FID1, FID2, FID3, FID4, FID5
4	0	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R3, R4, R18, R19
4	100nF 6.3V X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C2, C15, C16, C17
4	100nF X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C1, C5, C9, C14
4	47uF 10V X7R	stdlib_kicad-footprints_Capacitor_SMD:C_1210_3225Metric	C20, C21, C22, C23
4	KMR221NG LFS	lena_registry_components_Littelfuse_KMR2x1NGLFS@0.1.1:KMR2x1NGLFS	SW1, SW2, SW3, SW4
3	10k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R1, R2, R22
3	1uF 6.3V X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C10, C11, C18
3	TestPoint_Small	stdlib_kicad-footprints_TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm	TP1, TP2, TP3
2	1uF X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C7, C8
2	2.2M	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R7, R9
2	200mA 30V Schottky Rectifier	stdlib_kicad-footprints_Diode_SMD:D_SOD-323	D1, D2
2	8.2pF C0G	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C12, C13
2	M2 DIN965 Mechanical	stdlib_kicad-footprints_MountingHole:MountingHole_2.2mm_M2_DIN965	H1, H2
2	SJ-3523-SMT-TR	lena_registry_components_Same_Sky_SJ-3523-SMT@0.1.0:SJ-3523-SMT	J1, J2
1	1.5nF C0G	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C4
1	10M	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R21
1	1M	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R20
1	2.2uF 25V X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C3
1	2.7k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R6
1	220nF X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C6
1	22M	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R11
1	3034TR	lena_registry_components_Keystone_3034@0.1.0:Keystone_3034	BT1
1	32.768kHz 7pF	stdlib_kicad-footprints_Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm	Y1
1	33k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R5
1	39k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R8
1	4.7uF 6.3V X7R	stdlib_kicad-footprints_Capacitor_SMD:C_0603_1608Metric	C19
1	62k	stdlib_kicad-footprints_Resistor_SMD:R_0603_1608Metric	R10
1	AYF531035	lena_registry_components_Panasonic_AYF531035@0.1.0:AYF531035	J4
1	DMP2045U-7	lena_registry_components_Diodes_Incorporated_DMP2045U-7@0.1.0:SOT-23_Diodes_Standard	Q1
1	FTSH-105-01-L-DV-K-A-P-TR	lena_registry_components_Samtec_FTSH-105-01-L-DV-K-A-P-TR@0.1.1:FTSH-105-01-L-DV-K-A-P-TR	J3
1	MCP6042T-I/MS	lena_registry_components_Microchip_Technology_MCP6042T-I_MS@0.1.0:MSOP-8_3x3mm_P0.65mm_Microchip_MS	U1
1	STM32U083KCU6	lena_registry_components_STMicroelectronics_STM32U083KCU6@0.1.0:ST_UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.6x3.6mm	U2

Questions

How big is the Eda PCB?

It measures 44 × 72 mm and has 2 copper layers, 1.62 mm thick.

What parts does the Eda use?

86 parts, built around the STM32U083KCU6, SJ-3523-SMT-TR, 3034TR and AYF531035. 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 Eda KiCad files?

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

Can I use the Eda design in my own project?

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

Category and platform

Audio and music STM32

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/rcyaon-funbbit" title="Eda 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/rcyaon-funbbit.jpg" alt="Eda" width="1200" height="900">

A picture that opens the board, for a README

[![Eda](https://pcbkit.io/embed/boards/rcyaon-funbbit.jpg?size=s)](https://pcbkit.io/boards/rcyaon-funbbit)

Source

Repository: rcyaon/funbbit
Board file: eda/eda.kicad_pcb
Commit: e6678b1
Licence: Not stated

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