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Multibus mainboard

coriolisinstruments·EurorackModules·Multibus/hardware/Multibus/Multibus_mainboard.kicad_pcb

Multibus mainboard PCB layout, top view — open source board by coriolisinstruments
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About the Multibus mainboard PCB

Multibus mainboard is an open source PCB design by coriolisinstruments, published on GitHub. It is a 2-layer board measuring 526 × 20 mm, with 138 components from 15 distinct parts.

Other key parts include the TL074. By type, the board carries 99 resistors, 13 capacitors, 9 ICs and 2 diodes.

It belongs with the audio designs in this gallery.

From the project

Open-source eurorack synthesizer modules and related stuff.

A eurorack module for the distribution of CV signals. In essence it is 9 1-to-3 buffered multipes with signal indicators in grouped in three channels of three multiples. The "twist" is that every single multiple can be switch to work solo, so when you are not using the multiples as a distribution bus, you can still use them for something else.

You can use multiple inputs to combine signals (triggers, lfo's) like you would with a mixer and distribute these signals around your case. The Multibus has a variable gain for each channel, with the gain ranging from 0 to 1 (unity gain). This way you…

Multibus mainboard, from the project README
From the project README

Main components on the Multibus mainboard

TL074

Multibus mainboard bill of materials (BOM)

138 components, 15 distinct parts.

QtyPartRefs
9
TL074
U1.1, U1.2, U1.3, U2.1, U2.2, U2.3, U3.1, U3.2 +1
9
Conn_01x12
J_MB1.1, J_MB1.2, J_MB1.3, J_MB2.1, J_MB2.2, J_MB2.3, J_MB3.1, J_MB3.2 +1
3
Conn_01x02
J_MB_RV1, J_MB_RV2, J_MB_RV3
1
Conn_02x05_Odd_Even
J_PWR1
2
10R
R_FUSE_1, R_FUSE_2
2
IN4001
D1, D2
2
10uF (25V)
C1, C2
9
10pF
C1.1.feedback.1, C1.2.feedback.1, C1.3.feedback.1, C2.1.feedback.1, C2.2.feedback.1, C2.3.feedback.1, C3.1.feedback.1, C3.2.feedback.1 +1
2
100nF
C3, C4
45
100K
R1.1.feedback.1, R1.1.feedback.2, R1.1.in.1, R1.1.in.2, R1.1.in.3, R1.2.feedback.1, R1.2.feedback.2, R1.2.in.1 +37
12
1K
R1.1.led.1, R1.1.split.2, R1.2.led.1, R1.2.split.2, R1.3.led.1, R1.3.split.2, R2.1.split.2, R2.2.split.2 +4
27
51
R1.1.out.1, R1.1.out.2, R1.1.out.3, R1.2.out.1, R1.2.out.2, R1.2.out.3, R1.3.out.1, R1.3.out.2 +19
9
10K
R1.1.split.1, R1.2.split.1, R1.3.split.1, R2.1.split.1, R2.2.split.1, R2.3.split.1, R3.1.split.1, R3.2.split.1 +1
3
510R
R2.1.led.1, R2.2.led.1, R2.3.led.1
3
5K1
R3.1.led.1, R3.2.led.1, R3.3.led.1

Multibus mainboard design files

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

Multibus mainboard: common questions

How big is the Multibus mainboard PCB?

The Multibus mainboard measures 526 × 20 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Multibus mainboard?

138 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Multibus mainboard design files?

From the coriolisinstruments/EurorackModules repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Multibus mainboard design in my own project?

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

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