HardLabs

Feather

wolf-yuan-6115·lightwolf·feather/feather.kicad_pcb

Feather PCB layout, top view — open source RP2040/RP2350 board by wolf-yuan-6115

About the Feather PCB

Feather is an open source RP2040/RP2350 PCB design by wolf-yuan-6115, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 61.4 × 38.8 mm, with 137 components from 37 distinct parts.

Its main chip is the RP2354A, from the RP2040/RP2350 family. Other key parts include the TLV76733DRVX, LM27762, TAD5242IRGER, OPA1612AXD and OPA1622. By type, the board carries 55 resistors, 48 capacitors, 13 diodes, 11 ICs, 4 switches and 3 connectors.

It belongs with the dev boards & breakouts and audio designs in this gallery.

From the project

A USB DAC that provides even better audio quality compared to Pumper. Since I want to make the board as small as possible, the board itself is only 6x4 cm.

A USB DAC that provides even better audio quality compared to Pumper. Since I want to make the board as small as possible, the board itself is only 6x4 cm.

This board has two outputs: One is 3.5mm unbalanced output, another one is 4.4mm balanced, for headphone that supports this and it can provide more power through this port.

Due to being half Hi-Fi fan, I want to try out some new method to get better audio. Like previous project Pumper, already got amazing power to drive headphone. Though it has some flaw and I think it's got not very balanced sound profile.

Feather, from the project README
From the project README

Main components on the Feather

TLV76733DRVXLM27762TAD5242IRGEROPA1612AXDRP2354AOPA1622

Feather bill of materials (BOM)

137 components, 37 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
TLV76733DRVX
TLV76733DRVx
U1, U4
1
LM27762
U2
1
TAD5242IRGER
U3
3
OPA1612AXD
OPA1612AxD
U5, U7, U8
1
RP2354A
U6
3
OPA1622
U9, U10, U11
1
12MHZ
12MHz
X1
1
ST-0337D00-071-1A2H
G-Switch(品赞)
CN1
1
GT-3321667P-01
G-Switch(品赞)
CN2
1
C2927039
Connector, USB-TYPE-C-16P
J1
1
0603L075SLYR
F1
4
1TS015A-1400-0600-CT
SW1, SW2, SW3, SW4
1
TPD2E001DZDR
D1
1
C2286
Red
Hubei KENTO Elec
D2
1
C7496823
Blue
D3
2
C89811
Yellow
Foshan NationStar Optoelectronics
D4, D5
8
TPD1E10B06DPYR
D6, D7, D8, D9, D10, D11, D12, D13
1
AOTA-B201610S3R3-101-T
L1
26
100NF
100nF
Samsung Electro-Mechanics
C1, C2, C3, C9, C21, C23, C24, C25 +18
4
1UF
1uF
Samsung Electro-Mechanics
C4, C12, C15, C16
Show 17 more
QtyPartRefs
2
2.2UF
2.2uF
Samsung Electro-Mechanics
C5, C17
2
2.2UF
2.2uF
Samsung Electro-Mechanics
C6, C20
4
10UF
10uF
Samsung Electro-Mechanics
C7, C8, C11, C13
4
4.7UF
4.7uF
Samsung Electro-Mechanics
C10, C19, C22, C33
2
4.7NF
4.7nF
FH(Guangdong Fenghua Advanced Tech)
C14, C18
2
4.7UF
4.7uF
Samsung Electro-Mechanics
C35, C36
2
15PF
15pF
FH(Guangdong Fenghua Advanced Tech)
C37, C40
2
5.1kΩ
UNI-ROYAL(Uniroyal Elec)
R1, R2
2
330kΩ
UNI-ROYAL(Uniroyal Elec)
R3, R9
2
120kΩ
UNI-ROYAL(Uniroyal Elec)
R4, R6
5
10kΩ
UNI-ROYAL(Uniroyal Elec)
R5, R18, R19, R20, R21
34
1kΩ
UNI-ROYAL(Uniroyal Elec)
R7, R8, R10, R11, R23, R24, R25, R26 +26
4
10kΩ
UNI-ROYAL(Uniroyal Elec)
R12, R13, R15, R16
1
33Ω
UNI-ROYAL(Uniroyal Elec)
R14
2
27Ω
UNI-ROYAL(Uniroyal Elec)
R17, R22
2
100kΩ
UNI-ROYAL(Uniroyal Elec)
R33, R51
1
330Ω
UNI-ROYAL(Uniroyal Elec)
R41

Feather design files

The KiCad project lives in the wolf-yuan-6115/lightwolf repository on GitHub; these links point at the commit this page was built from.

Feather: common questions

What microcontroller does the Feather use?

The Feather is built around the RP2354A, from the RP2040/RP2350 family.

How big is the Feather PCB?

The Feather measures 61.4 × 38.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Feather?

137 components, from 37 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Feather design files?

From the wolf-yuan-6115/lightwolf repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Feather design in my own project?

Yes, under the terms of its GPL-3.0 license, which wolf-yuan-6115 chose for the repository.

Can I test firmware for the Feather without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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