2 layers48.4 × 106.3 mm
2 layers30 × 241 mm
Another simple signal mixing module, this time 3U and only regular patch jacks
- Size
- 30 × 241 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 26
- Pads
- 99
- Tracks, vias
- 105, 5
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 30 Apr 2026
- Updated
- 6 Jun 2026
Overview
Mix2 is an open-source printed circuit board by thismatters, from the thismatters/EurorackMix2 repository on GitHub. It is a 2-layer board of 30 × 241 mm with 39 parts on 26 nets, routed with 105 tracks and 5 vias.
It is built around the TL072 and BAT54S. Its parts include 10 resistors, 6 connectors, 3 capacitors, 2 diodes and 1 IC.
Main components
2README
README.mdMix
A simple mixing circuit which allows adjustment of each input before combining to a single output. Really simple.
The KiCAD project here uses the library/footprints found in my companion repo.
Width
6hp
Inputs
- Four signal jack
- Four signal knobs
Outputs
One signal jack with combined output
Vendors
There are part numbers in the BOM for many of the parts (not for basic passives though) at the following vendors:
- Mouser: Needs no introduction. Get your ICs from here (or digikey).
- Tayda Electronics: Good supplier for passive components; audio jacks, and potentiometers. Their audio jacks are slightly smaller than the thonkiconn from thonk.
- Love My Switches: Has really good knobs to go on those potentiometers!
- OSHPark: Fast and (relatively) cheap PCB manufacturer. Prototype run pending.
Changelog
Parts
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100K | Resistor_SMD:R_0805_2012Metric | R3, R4, R5, R6, R7, R8, R9, R10 |
| 4 | A250K | Eurorack:Potentiometer_RV16AF-41-15R1 | RV1, RV2, RV3, RV4 |
| 3 | mount1 | Eurorack:Mech-MountingHole | H2, H3, H4 |
| 2 | 10 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 22u 50V | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C2 |
| 2 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D1, D2 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | Conn_02x05_Odd_Even | Eurorack:PinHeader_2x05_P2.54mm_Vertical | J1 |
| 1 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | in0 | Eurorack:Mech-AudioJack-Hole-Input | H5 |
| 1 | in0 | Eurorack:AudioJack2_Tayda_A-2566 | J2 |
| 1 | in1 | Eurorack:Mech-AudioJack-Hole-Input | H6 |
| 1 | in1 | Eurorack:AudioJack2_Tayda_A-2566 | J3 |
| 1 | in2 | Eurorack:Mech-AudioJack-Hole-Input | H7 |
| 1 | in2 | Eurorack:AudioJack2_Tayda_A-2566 | J4 |
| 1 | in3 | Eurorack:AudioJack2_Tayda_A-2566 | J5 |
| 1 | in3 | Eurorack:Mech-AudioJack-Hole-Input | H8 |
| 1 | lvl 1 | Eurorack:Mech-Potentiometer-Hole_level | H10 |
| 1 | lvl 2 | Eurorack:Mech-Potentiometer-Hole_level | H11 |
| 1 | lvl 3 | Eurorack:Mech-Potentiometer-Hole_level | H12 |
| 1 | lvl 4 | Eurorack:Mech-Potentiometer-Hole_level | H13 |
| 1 | mount0 | Eurorack:Mech-MountingHole | H1 |
| 1 | out | Eurorack:Mech-AudioJack-Hole-Output | H9 |
| 1 | out | Eurorack:AudioJack2_Tayda_A-2566 | J6 |
Questions
How big is the Mix2 PCB?
It measures 30 × 241 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mix2 use?
39 parts, built around the TL072 and BAT54S. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Mix2 KiCad files?
From the thismatters/EurorackMix2 repository on GitHub, at the commit this page was made from: the board is mix2.kicad_pcb and its schematic mix2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mix2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask thismatters before reusing the design.
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