HardLabs

Mainboard

jypma·modsynth·DuinoRack/mainboard/mainboard.kicad_pcb

Mainboard PCB layout, top view — open source AVR/Arduino board by jypma
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About the Mainboard PCB

Mainboard is an open source AVR/Arduino PCB design by jypma, published on GitHub. It is a 2-layer board measuring 39.4 × 108 mm, with 122 components from 45 distinct parts.

Its main chip is the ATmega328P-P, from the AVR/Arduino family. Other key parts include the MCP4822, TL074, TL431DBZ, MCP6004 and LM1117-5.0. By type, the board carries 60 resistors, 40 capacitors, 8 ICs, 5 connectors, 5 diodes and 3 jumpers.

It belongs with the audio designs in this gallery.

From the project

Open hardware eurorack synth modules

- Screen - 2 Encoders - 2 bipolar CV inputs with Attenuverters and offset - On the MIDI variant, two attenuverters+offset are removed, to make space (only CV in for those). CV inputs: attenuators plus offset, offset positive only - 2 Gate inputs with trigger button. - 2 CV outputs (from MPC4822, SPI) - 2 Gate outputs (some I/O port)

Encoder 1: Select UI element Encoder 2: Change value (immediate)

Main components on the Mainboard

MCP4822ATmega328P-PTL074TL431DBZMCP6004LM1117-5.06N138

Mainboard bill of materials (BOM)

122 components, 45 distinct parts.

QtyPartRefs
1
MCP4822
U1
1
ATmega328P-P
U2
1
TL074
U3
2
TL431DBZ
U4, U8
1
MCP6004
U5
1
LM1117-5.0
U6
1
6N138
U7
1
16MHz
Y1
1
SER
J2
1
Conn_02x08_Odd_Even
J3
1
Conn_02x05_Odd_Even
J4
1
Conn_MIDI
J5
1
Conn_02x03_Odd_Even
J6
1
!PROGRAM
JP1
1
IN3_EN2
JP2
1
IN3_EN1
JP3
1
5.1V
D1
2
1N4148WS
D2, D7
2
1N4007
D8, D9
18
100n
C1, C2, C3, C4, C5, C6, C7, C8 +10
Show 25 more
QtyPartRefs
12
1n 1%
C9, C10, C11, C21, C22, C23, C33, C34 +4
2
10u
C12, C15
2
18p
C13, C14
2
10uF
C16, C17
4
1u
C29, C30, C31, C32
2
10k
R1, R30
2
30k
R2, R4
2
20k
R3, R5
2
47k
R6, R7
2
120k
R8, R9
5
1k
R10, R11, R12, R23, R24
1
200k 0.1%
R13
3
100k 0.1%
R14, R59, R60
17
220
R15, R16, R19, R25, R26, R29, R31, R32 +9
4
100k
R17, R18, R47, R48
4
18k 1%
R20, R22, R38, R40
1
4.7k 1%
R21
2
220k
R27, R28
2
10
R34, R35
1
4.7k
R39
2
75k
R49, R50
4
15k 0.1%
R51, R52, R55, R56
2
3.9k 0.1%
R53, R54
1
510
R57
1
330
R58

Mainboard design files

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

Mainboard: common questions

What microcontroller does the Mainboard use?

The Mainboard is built around the ATmega328P-P, from the AVR/Arduino family.

How big is the Mainboard PCB?

The Mainboard measures 39.4 × 108 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mainboard?

122 components, from 45 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mainboard design files?

From the jypma/modsynth repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mainboard design in my own project?

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

Can I test firmware for the Mainboard 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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