2 layers132.1 × 213.4 mm
2 layers152.1 × 64.7 mm
Simple module for audio signal mixing
- Size
- 152.1 × 64.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 48
- Pads
- 175
- Tracks, vias
- 302, 22
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 13 Jul 2024
- Updated
- 25 Nov 2024
Overview
Mix is an open-source printed circuit board by thismatters, from the thismatters/EurorackMix repository on GitHub. It is a 2-layer board of 152.1 × 64.7 mm with 70 parts on 48 nets, routed with 302 tracks and 22 vias.
It is built around the TL072, BAT54S and BCM847BS. Its parts include 26 resistors, 8 diodes, 6 connectors, 5 capacitors and 2 ICs. It belongs with the audio and music boards of this library.
Main components
3
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
BAT54S
SOT-231 Pair Series Connection 1V@100mA 200mA 2uA@25V 30V 600mA SOT-23 Schottky Diodes ROHSMDDSchottky Diodes
BCM847BS
SOT-363-65℃~+150℃ 100mA 15nA 2 NPN 200 250MHz 300mW 400mV 45V 6V NPN SOT-363 Bipolar (BJT) ROHSNexperiaBipolar (BJT)
README
README.mdMix
Audio signal mixing. Basic module with simple OP Amp design.
The KiCAD project here uses the library/footprints found in my companion repo.
Size
30hp on a 1u rack.
Inputs
4x patch inputs and 4x potentiometers for adjusting the apparent effect of a patch input
Outputs
Single 1/4" phone jack output. 4 LED array indicating output level.
Notes
LED array takes some cues from the MFOS Multifunction Module
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. The V0 circuit works pretty well as a mix, but the output level indicator doesn't quite work right, there will be another version.
Changelog
V1
- Adds full bridge rectifier to output level indicator
- Adds capacitor and resistor to output level indicator
- Removes capacitor from output op amp
- Updates design langage
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 100K | Resistor_SMD:R_0805_2012Metric | R3, R4, R5, R6, R7, R8, R9, R15, R16, R17, R18, R19, R24 |
| 4 | 470 | Resistor_SMD:R_0805_2012Metric | R20, R21, R22, R23 |
| 4 | A250K | Eurorack:Potentiometer_RV16AF-41-15R1 | RV1, RV2, RV3, RV4 |
| 4 | AudioJack2_SwitchT | Eurorack:AudioJack2_Tayda_A-2566 | J2, J3, J4, J5 |
| 3 | 100n | Capacitor_SMD:C_0805_2012Metric | C3, C4, C5 |
| 3 | 270K | Resistor_SMD:R_0805_2012Metric | R12, R13, R14 |
| 3 | LED_GREEN | LED_THT:LED_D3.0mm | D4, D5, D6 |
| 2 | 10 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 10K | Resistor_SMD:R_0805_2012Metric | R25, R26 |
| 2 | 1N4148 | Diode_SMD:D_SOD-323_HandSoldering | D7, D8 |
| 2 | 22u 50V | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C2 |
| 2 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D1, D2 |
| 2 | BCM847 | Package_SO:TSOP-6_1.65x3.05mm_P0.95mm | Q1, Q2 |
| 1 | 1K | Resistor_SMD:R_0805_2012Metric | R10 |
| 1 | 300K | Resistor_SMD:R_0805_2012Metric | R11 |
| 1 | AudioJack2 | Eurorack:AudioJack2_Tayda_A-1009 | J6 |
| 1 | Conn_02x05_Odd_Even | Eurorack:PinHeader_2x05_P2.54mm_Vertical | J1 |
| 1 | IN0 | Eurorack:Mech-AudioJack-Hole-Input | H5 |
| 1 | IN1 | Eurorack:Mech-AudioJack-Hole-Input | H6 |
| 1 | IN2 | Eurorack:Mech-AudioJack-Hole-Input | H7 |
| 1 | IN3 | Eurorack:Mech-AudioJack-Hole-Input | H8 |
| 1 | LED0 | Eurorack:Mech-LED-Hole-3mm-Bezel | H13 |
| 1 | LED1 | Eurorack:Mech-LED-Hole-3mm-Bezel | H14 |
| 1 | LED2 | Eurorack:Mech-LED-Hole-3mm-Bezel | H15 |
| 1 | LED3 | Eurorack:Mech-LED-Hole-3mm-Bezel | H16 |
| 1 | LED_ORANGE | LED_THT:LED_D3.0mm | D3 |
| 1 | MOUNT0 | Eurorack:Mech-MountingHole | H1 |
| 1 | MOUNT1 | Eurorack:Mech-MountingHole | H2 |
| 1 | MOUNT2 | Eurorack:Mech-MountingHole | H3 |
| 1 | MOUNT3 | Eurorack:Mech-MountingHole | H4 |
| 1 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | TL074 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | lvl 0 | Eurorack:Mech-Potentiometer-Hole_level_90deg | H9 |
| 1 | lvl 1 | Eurorack:Mech-Potentiometer-Hole_level_90deg | H10 |
| 1 | lvl 2 | Eurorack:Mech-Potentiometer-Hole_level_90deg | H11 |
| 1 | lvl 3 | Eurorack:Mech-Potentiometer-Hole_level_90deg | H12 |
| 1 | out | Eurorack:Mech-Hole-10mm | H17 |
Questions
How big is the Mix PCB?
It measures 152.1 × 64.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mix use?
70 parts, built around the TL072, BAT54S and BCM847BS. 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 Mix KiCad files?
From the thismatters/EurorackMix repository on GitHub, at the commit this page was made from: the board is mix.kicad_pcb and its schematic mix.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mix 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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