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Mixer

masl123·EurorackStereoMixer

Mixer PCB layout, top view — open source board by masl123

About the Mixer PCB

Mixer is an open source PCB design by masl123, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 60 × 102 mm, with 130 components from 23 distinct parts.

Other key parts include the TL074 and TL072. By type, the board carries 42 capacitors, 36 resistors, 29 connectors, 10 modules, 6 ICs and 2 diodes.

It belongs with the audio designs in this gallery.

From the project

A Stereo Mixer Module for Eurorack

This Eurorack module allows to mix stereo signals from up to 4 channels into one while also allowing to change the volume for each of the channels. The master volume can also be changed. By plugging a mono signal into the left input of a channel, the signal is mirrored to the right channel of the mixer. This allows for mixing mono and stereo signals.

The module consists of 2 PCBs and a Frontpanel.

Mixer, from the project README
From the project README

Main components on the Mixer

TL074TL072

Mixer bill of materials (BOM)

130 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
TL074
U1, U2, U3, U4
2
TL072
U5, U6
10
~
A1, A2, A3, A4, A5, A6, A7, A8 +2
2
Conn_01x06
J1, J16
2
Conn_01x06
J2, J17
10
Conn_01x02
J3, J4, J5, J6, J11, J18, J19, J20 +2
10
Conn_01x02
J7, J8, J9, J10, J12, J22, J23, J24 +2
1
~
J13
2
Conn_01x03
J14, J28
2
Conn_01x03
J15, J29
5
A100k
RV1, RV2, RV3, RV4, RV5
2
1N5819
D1, D2
14
100n
C1, C2, C3, C4, C5, C6, C11, C12 +6
8
220n
C7, C8, C9, C10, C30, C31, C32, C33
8
47p
C13, C14, C15, C16, C34, C35, C36, C37
8
470n
C19, C20, C21, C22, C38, C39, C40, C41
2
220p
C25, C42
2
10u
C28, C29
8
10k
R1, R2, R3, R4, R19, R20, R21, R22
8
43k
R5, R6, R7, R8, R23, R24, R25, R26
Show 3 more
QtyPartRefs
8
1M
R9, R10, R11, R12, R27, R28, R29, R30
10
20k
R13, R14, R15, R16, R17, R31, R32, R33 +2
2
100k
R18, R36

Mixer design files

The KiCad project lives in the masl123/EurorackStereoMixer repository on GitHub; these links point at the commit this page was built from.

Mixer: common questions

How big is the Mixer PCB?

The Mixer measures 60 × 102 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mixer?

130 components, from 23 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 Mixer design files?

From the masl123/EurorackStereoMixer 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 Mixer design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which masl123 chose for the repository.

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