HardLabs

Audio Slice

LOEWE-emergenCITY·freespeaker·electric_design/FreeSpeaker/Speaker/Speaker.kicad_pcb

Audio Slice PCB layout, top view — open source AVR/Arduino board by LOEWE-emergenCITY

About the Audio Slice PCB

Audio Slice is an open source AVR/Arduino PCB design by LOEWE-emergenCITY, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 79 components from 29 distinct parts.

Its main chip is the ATmega32-16A, from the AVR/Arduino family. Other key parts include the ReSpeaker_4-Mic_Linear_Array, TPA3140D2PWPR and slice_connector_male. By type, the board carries 42 capacitors, 18 resistors, 5 connectors, 5 inductors, 4 ICs and 1 diode.

It belongs with the audio and iot & wireless designs in this gallery.

From the project

The modular, research-friendly smart home hub

For developing we used KiCAD which is an open source CAD software. It was used by the Raspberry Pi Foundation for their IO Board and the Compute Module.

ONLY store files we already build. First step will only have project and schematics!

Each subdir is a stand alone KiCAD project.

The top level project is - for referencing the different schematics - showing the dependencies between the different PCBs - documentation - generating a full bill of material

Main components on the Audio Slice

ReSpeaker_4-Mic_Linear_ArrayTPA3140D2PWPRATmega32-16Aslice_connector_male

Audio Slice bill of materials (BOM)

79 components, 29 distinct parts.

QtyPartRefs
1
ReSpeaker_4-Mic_Linear_Array
U1
1
TPA3140D2PWPR
U2
1
ATmega32-16A
U4
1
slice_connector_male
U5
1
AudioJack3
CUI Devices
J1
1
AVR-JTAG-10
J2
1
Conn_02x04_Odd_Even
J4
2
Screw_Terminal
Phoenix Contact
J5, J7
4
SPU0410HR5H-SB-7
MIC1, MIC2, MIC3, MIC4
1
LED Green
D2
4
FerriteBead
FB1, FB2, FB3, FB4
1
10m
L1
6
1uF
C1, C4, C5, C6, C7, C8
1
10n
C2
1
100n
C3
6
1nF
C9, C10, C19, C20, C21, C22
4
220nF
C11, C12, C13, C16
10
100nF
C14, C15, C23, C24, C25, C26, C27, C28 +2
2
100uF Tantalum
C17, C18
4
33pF
C29, C30, C31, C44
Show 9 more
QtyPartRefs
8
10nF
C32, C33, C34, C35, C36, C37, C47, C48
1
39k 1%
R1
3
33k 1%
R2, R3, R8
1
120
R4
2
2K2
R5, R6
1
56k 1%
R7
8
51R 1%
R9, R10, R11, R12, R13, R14, R17, R18
1
10k 1%
R15
1
10R 1%
R16

Audio Slice design files

The KiCad project lives in the LOEWE-emergenCITY/freespeaker repository on GitHub; these links point at the commit this page was built from.

Audio Slice: common questions

What microcontroller does the Audio Slice use?

The Audio Slice is built around the ATmega32-16A, from the AVR/Arduino family.

How big is the Audio Slice PCB?

The Audio Slice measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Audio Slice?

79 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Audio Slice design files?

From the LOEWE-emergenCITY/freespeaker repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Audio Slice design in my own project?

The repository has no license, so all rights stay with LOEWE-emergenCITY. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Audio Slice without the hardware?

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

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