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Main board

m0xpd·STRACHEY·Hardware/Main/main board.kicad_pcb

Main board layout, top view — open source AVR/Arduino board by m0xpd
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About the Main board

Main board is an open source AVR/Arduino PCB design by m0xpd, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 108 × 88 mm, with 124 components from 26 distinct parts.

Its main chip is the ARDUINO_NANO, from the AVR/Arduino family. Other key parts include the TL084P, 4081, MCP9422 and 78LXX. By type, the board carries 69 resistors, 18 diodes, 16 capacitors, 9 ICs, 5 jumpers and 4 transistors.

It belongs with the audio designs in this gallery.

From the project

A Random Looping Sequencer for Eurorack

This folder contains details of STRACHEY's Main Board which you seen below (component side)

You can download the main board's schematic as a .sch file into your PCB program (KiCad etc) or see a PDF version.

The Main Board hosts power supplies, the Arduino Nano, the DACs, output drivers, input protection and conditioning circuits, the Turing Machine Expansion port, and interface to the control Board.

Main board, from the project README
From the project README

Main components on the Main board

TL084P4081MCP942278LXXARDUINO_NANO

Main board bill of materials (BOM)

124 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
TL084P
IC1, IC2, IC4, IC8
2
4081
IC3, IC6
1
MCP9422
IC5
1
78LXX
IC7
1
ARDUINO_NANO
U$1
4
BC546
Q1, Q2, Q3, Q4
1
2510-
X1
2
PINHD-1X18
JP1, JP5
1
PINHD-1X8
JP2
1
PINHD-1X3
JP3
1
PINHD-2X8
JP4
2
1k
TR1, TR2
14
BAT42
D1, D2, D3, D4, D5, D6, D7, D8 +6
2
1N4148DO35-7
D9, D17
2
1N5817
D10, D18
13
0.1u
C1, C2, C3, C4, C5, C6, C7, C8 +5
2
22u
C10, C13
1
1u
C15
34
10k
R1, R2, R3, R4, R5, R7, R13, R17 +26
1
1k
R6
Show 6 more
QtyPartRefs
2
100k
R8, R64
4
470
R9, R10, R11, R12
6
1M
R14, R16, R53, R54, R55, R56
2
470R
R15, R65
18
R-EU_0204/7
R27, R28, R29, R30, R31, R32, R33, R34 +10
2
10
R52, R60

Main board design files

The KiCad project lives in the m0xpd/STRACHEY repository on GitHub; these links point at the commit this page was built from.

Main board: common questions

What microcontroller does the Main board use?

The Main board is built around the ARDUINO_NANO, from the AVR/Arduino family.

How big is the Main board?

The Main board measures 108 × 88 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main board?

124 components, from 26 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 Main board design files?

From the m0xpd/STRACHEY 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 Main board design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which m0xpd chose for the repository.

Can I test firmware for the Main board 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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