HardLabs

Bmmx

Bemeier·bmmx

Bmmx PCB layout, top view — open source board by Bemeier

About the Bmmx PCB

Bmmx is an open source PCB design by Bemeier, published on GitHub. It is a 4-layer board measuring 40 × 110 mm, with 145 components from 28 distinct parts.

Other key parts include the OPA1679, CD40106 and ADG1334. By type, the board carries 74 resistors, 29 capacitors, 15 connectors, 12 diodes and 7 ICs.

It belongs with the audio designs in this gallery.

From the project

Expandable 4x2 Matrix Mixer for Eurorack

A Eurorack 4x2 Matrix Mixer Module. It can be expanded with itself. Panel Inputs on the expanding module are "normalled" to the preceding inputs. Input normalling can be broken by plugging in cables into the expanding module.

Mixer schematic taken from bartinstruments.com's b:raid Matrix Mixer.

Production files can be found in production/BMMX.zip. A CPL & BOM file for JLCPCB is next to it.

Bmmx, from the project README
From the project README

Main components on the Bmmx

OPA1679CD40106ADG1334

Bmmx bill of materials (BOM)

145 components, 28 distinct parts.

QtyPartRefs
4
OPA1679
U401, U402, U404, U405
1
CD40106
U403
2
ADG1334
U406, U407
1
IDC CONN
J141
1
IN_1_L
J401
1
IN_1_R
J402
1
IN_2_L
J403
1
IN_2_R
J404
1
IN_3_L
J405
1
IN_3_R
J406
1
IN_4_L
J407
1
IN_4_R
J408
2
Conn_01x10_MountingPin
J409, J410
1
OUT_1_L
J411
1
OUT_2_L
J412
1
OUT_1_R
J416
1
OUT_2_R
J417
8
A10k
RV401, RV402, RV406, RV407, RV411, RV412, RV416, RV417
12
SD12C-01FTG
D401, D402, D403, D404, D405, D406, D407, D408 +4
2
10u 35V
C102, C107
Show 8 more
QtyPartRefs
11
100n
C104, C106, C421, C422, C423, C424, C426, C429 +3
16
100p
C401, C402, C406, C407, C411, C412, C416, C417 +8
2
0.1
R137, R142
8
100
R401, R402, R415, R416, R429, R430, R443, R444
16
100k
R403, R404, R417, R418, R431, R432, R445, R446 +8
32
10k
R405, R406, R410, R411, R419, R420, R424, R425 +24
4
330k
R483, R484, R485, R488
12
1k
R501, R502, R503, R505, R506, R507, R508, R509 +4

Bmmx design files

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

Bmmx: common questions

How big is the Bmmx PCB?

The Bmmx measures 40 × 110 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the Bmmx?

145 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bmmx design files?

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

Can I use the Bmmx design in my own project?

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

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