HardLabs

Mls800

blemasle·mls800-pcb

Mls800 PCB layout, top view — open source AVR/Arduino board by blemasle

About the Mls800 PCB

Mls800 is an open source AVR/Arduino PCB design by blemasle, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 293.4 × 80.5 mm, with 92 components from 36 distinct parts.

Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. Other key parts include the 6N137, LM340MP-5.0/NOPB, 24LC256, MCP23017 and AS1115. By type, the board carries 20 capacitors, 18 resistors, 14 connectors, 11 switches, 9 ICs and 6 diodes.

It belongs with the audio designs in this gallery.

From the project

8 MIDI controlled loops switcher PCBs

The MLS800 is an open-source 1U rack unit MIDI controlled Loop Switcher with 8 audio loops.

8 independent audio loops 128 presets Active preset is remotly controlled through MIDI Program Change messages Easy to read through a 4 digits 7 segments display and 9 illuminated switches

This repository contains KiCad files needed to produce the two PCBs.

See the documentation for futher info on the project.

Mls800, from the project README
From the project README

Main components on the Mls800

6N137LM340MP-5.0/NOPBATmega32U4-AU24LC256MCP23017AS1115ULN2803A

Mls800 bill of materials (BOM)

92 components, 36 distinct parts.

QtyPartRefs
1
6N137
IC1
2
LM340MP-5.0/NOPB
U1, U8
1
ATmega32U4-AU
U2
1
24LC256
U3
1
MCP23017
U4
1
AS1115
U5
2
ULN2803A
U6, U7
1
16Mhz
X1
1
BARREL_JACK
CON1
1
USB
J1
2
NRJ4HF-1
J2, J11
8
NSJ8HC
J3, J4, J5, J6, J7, J8, J9, J10
2
DIN_5
P2, P3
1
LTC-5723HR
AFF1
1
MF-MSMF050-2
F1
1
CONN_01X01
MH1
8
LATCH_DPDT
RE1, RE2, RE3, RE4, RE5, RE6, RE7, RE8
10
SW_TACT_LED
SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 +2
1
SW_PUSH_RIGHT_ANGLE
SW12
2
CG0603MLC-05E
VR1, VR2
Show 16 more
QtyPartRefs
2
1N4148
D1, D5
2
1N4001
D2, D6
1
Yellow
D3
1
Red
D4
2
22pF
C1, C2
2
0.22uF
C3, C17
11
0.1uF
C4, C5, C7, C9, C10, C11, C12, C13 +3
1
1uF
C6
1
22uF
C8
3
100uF
C15, C16, C19
4
10k
R1, R4, R6, R7
1
0R
R2
7
1k
R5, R8, R9, R10, R11, R12, R18
2
22R
R13, R14
3
220R
R15, R16, R17
1
23.6k
R19

Mls800 design files

The KiCad project lives in the blemasle/mls800-pcb repository on GitHub; these links point at the commit this page was built from.

Mls800: common questions

What microcontroller does the Mls800 use?

The Mls800 is built around the ATmega32U4-AU, from the AVR/Arduino family.

How big is the Mls800 PCB?

The Mls800 measures 293.4 × 80.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mls800?

92 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mls800 design files?

From the blemasle/mls800-pcb repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Mls800 design in my own project?

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

Can I test firmware for the Mls800 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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