HardLabs

Guitarboard

JonasNorling·guitarboard·hw/m4audio.kicad_pcb

Guitarboard PCB layout, top view — open source STM32 board by JonasNorling

About the Guitarboard PCB

Guitarboard is an open source STM32 PCB design by JonasNorling, published on GitHub under the MIT license. It is a 2-layer board measuring 49.7 × 49.7 mm, with 86 components from 32 distinct parts.

Its main chip is the STM32F405RG, from the STM32 family. Other key parts include the AP2210K-3.3, MCP6002 and WM8731. By type, the board carries 33 capacitors, 17 test points, 15 resistors, 12 connectors, 5 ICs and 2 diodes.

It belongs with the audio and power & battery designs in this gallery.

From the project

Cortex-M4 audio DSP board

This directory contains the hardware design in KiCAD format.

Board changelog and errata --------------------------

- Line out is missing footprints for some of the resistors recommended in the datasheet. It has not been tested. - Missing a discharge path for the audio input, as recommended in the datasheet. I don't think it's necessary in this application. - There is too much capacitance on the board to comply with the USB standard, and inrush current is not limited. - Silkscreen showing orientation of opamp and codec are unclear on finished board. - Some silkscreen text is too small. -…

Main components on the Guitarboard

AP2210K-3.3STM32F405RGMCP6002WM8731

Guitarboard bill of materials (BOM)

86 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
AP2210K-3.3
U1, U5
1
STM32F405RG
U2
1
MCP6002
U3
1
WM8731
U4
1
8MHz
Y1
1
502-35RASMT2BHNTRX
JACK_TRS
J1
1
JACK_TRS
J2
3
CONN_01X03
J11, J21, P5
3
CONN_01X02
P1, P7, P8
1
649-10118193-0001LF
USB_OTG
P2
1
CONN_02X05
P3
1
CONN_01X08
P4
1
CONN_01X04
P6
17
TST
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +9
1
green
D1
1
orange
D2
1
DNP
L1
2
10U16V
10u16V
C1, C28
9
10U
10u
C2, C10, C13, C16, C17, C18, C19, C20 +1
2
27P
27p
C3, C4
Show 12 more
QtyPartRefs
7
100N
100n
C5, C7, C8, C9, C11, C12, C27
1
1u
C6
1
DNP
C14
1
DNP
C15
2
220U
220u
C21, C22
2
DNP
C23, C24
2
2.2U
2.2u
C25, C26
4
DNP
C29, C30, C32, C33
1
10
R1
10
100K
100k
R2, R3, R4, R5, R6, R7, R10, R11 +2
2
470
R8, R9
2
560K
560k
R12, R13

Guitarboard design files

The KiCad project lives in the JonasNorling/guitarboard repository on GitHub; these links point at the commit this page was built from.

Guitarboard: common questions

What microcontroller does the Guitarboard use?

The Guitarboard is built around the STM32F405RG, from the STM32 family.

How big is the Guitarboard PCB?

The Guitarboard measures 49.7 × 49.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Guitarboard?

86 components, from 32 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 Guitarboard design files?

From the JonasNorling/guitarboard repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Guitarboard design in my own project?

Yes, under the terms of its MIT license, which JonasNorling chose for the repository.

Can I test firmware for the Guitarboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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