2 layers20 × 110 mm
IRONMix Mainboard V1
VoltageFoundryMod/IRONMix
Eurorack Line-level mixer and Headphone Output module in 4HP
80 parts2MIT
2 layers61.4 × 110.6 mm
IRONMix
VoltageFoundryMod/IRONMix2Eurorack Line-level mixer and Headphone Output module in 4HP
- Size
- 61.4 × 110.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 97
- Nets
- 82
- Pads
- 309
- Tracks, vias
- 1,197, 207
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 29 Jan 2025
- Updated
- 23 Jul 2026
Overview
IRONMix is an open-source printed circuit board by VoltageFoundryMod, from the VoltageFoundryMod/IRONMix repository on GitHub, published under the MIT licence. It is a 2-layer board of 61.4 × 110.6 mm with 97 parts on 82 nets, routed with 1,197 tracks and 207 vias.
It is built around the NE5532, OPA1642AID and TL072, with the B5817W and B5819W among its other parts. Its parts include 32 resistors, 26 capacitors, 19 connectors, 10 diodes and 5 ICs. It belongs with the audio and music boards of this library.
Main components
5
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
OPA1642AID
SOIC-8-18V~-2.25V、2.25V~18V -40℃~+85℃ 0.00005% 1.8mA 2 Pairs Differential Inputs 2-Channel Overvoltage protection SOIC-8 Audio Amplifiers ROHSTexas InstrumentsAudio AmplifiersTL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
B5817W
SOD-123-55℃~+150℃ 1A 1mA@20V 20V 450mV@1A Independent SOD-123 Schottky Diodes ROHShongjiachengSchottky DiodesB5819W
SOD-123-55℃~+125℃ 1.5A 1mA@40V 25A 40V 600mV@1A Standalone SOD-123 Schottky Diodes ROHSMDDSchottky Diodes
README
Readme.mdIRONMix Eurorack Module
Overview
Voltage Foundry Modular IRONMix is a dual-function Eurorack Module in 4HP. It is a line in mixer with 2 stereo inputs and Left/Right modular-level outputs and in it's lower section it is an output module with Left/Right modular-level inputs and a stereo output capable of driving headphones or line-level gear.
Features and Tips
- Two sections which can be used independently or together: a line in section and an output section.
- Line-in section with two stereo inputs, level controls, up to 40dB of gain, and 1MΩ input impedance and left/right modular-level outputs.
- Output section with two modular-level inputs for Left and Right channels, and a stereo output with volume control.
- Line level input is normalized to the output section, allowing the module to be used as a 2 stereo ins to stereo out mixer.
- Input section can be configured to accept line level or modular level signals, allowing the module to be used as a 2x left + 2x right mixer with modular level signals on the inputs and headphone/line level signals on the output.
- Output section right channel can be configured to be normalized to the left channel, allowing mono signals to be turned into stereo signals or normalized to the input section, allowing the module to be used as a 2 stereo ins to stereo out mixer.
- Stereo jacks on input section can be split with a stereo to 2x mono patch cable, allowing the module to be used as a 2x left + 2x right mixer with modular level signals on the inputs and headphone/line level signals on the output.
Check the module on ModularGrid.
Usage
For more details and usage instructions, see Manual.md.
Contact
For support and inquiries, please open an issue on the GitHub repository.
License
This project is licensed under the MIT License. See the LICENSE file for more information.
Thank you for choosing the IRONMix module. We hope it enhances your musical creativity and performance.
Parts
97| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | 4ms_Resistor:R_0603 | R5, R6, R7, R8, R12, R14, R16, R18 |
| 8 | 4.7u | 4ms_Capacitor:C_0805 | C5, C6, C7, C8, C17, C18, C19, C20 |
| 8 | B5817W | 4ms_Diode:D_SOD-123 | D1, D2, D3, D4, D5, D6, D7, D8 |
| 6 | Socket_02x05_P2.54mm_H5mm_TH | 4ms_Connector:Socket_2x05_2.54mm_TH | J10, J11, J12, J13, J14, J15 |
| 4 | 100n | 4ms_Capacitor:C_0603 | C25, C26, C27, C28 |
| 4 | 10K | 4ms_Resistor:R_0603 | R29, R30, R31, R32 |
| 4 | 1M | 4ms_Resistor:R_0603 | R1, R2, R3, R4 |
| 4 | 22p | 4ms_Capacitor:C_0603 | C11, C12, C13, C14 |
| 4 | 510 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R13, R15, R17 |
| 4 | 510 | 4ms_Resistor:R_0603 | R21, R22, R23, R24 |
| 4 | 68p | 4ms_Capacitor:C_0603 | C1, C2, C3, C4 |
| 4 | 75 | 4ms_Resistor:R_0603 | R33, R34, R35, R36 |
| 2 | 100K | 4ms_Resistor:R_0603 | R9, R10 |
| 2 | 10p | 4ms_Capacitor:C_0603 | C9, C10 |
| 2 | 10u | 4ms_Capacitor:C_0805 | C15, C16 |
| 2 | 22u | 4ms_Capacitor:C_0805 | C23, C24 |
| 2 | 39K | 4ms_Resistor:R_0603 | R19, R20 |
| 2 | 50kB | 4ms_Potentiometer:Potentiometer_Alps_RK09L_Double_Vertical | RV1, RV2 |
| 2 | B5819W | 4ms_Diode:D_SOD-123 | D13, D14 |
| 2 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1, FB2 |
| 2 | L | 4ms_Connector:Pins_1x02_2.54mm_TH | J16, J18 |
| 2 | NE5532 | 4ms_Package_SOIC:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U4, U5 |
| 2 | OPA1642 | 4ms_Package_SOIC:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U2, U3 |
| 2 | R | 4ms_Connector:Pins_1x02_2.54mm_TH | J17, J19 |
| 1 | 9mm_Dual_50k_DShaft_DualRow | 4ms_Potentiometer:Potentiometer_Alps_RK09L_Double_Vertical | POT2 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J7 |
| 1 | HeadphoneOut | 4ms_Jack:EighthInch_Stereo_PJ366ST | J9 |
| 1 | In_L | 4ms_Jack:EighthInch_PJ398SM | J3 |
| 1 | In_R | 4ms_Jack:EighthInch_PJ398SM | J4 |
| 1 | LineIn1 | 4ms_Jack:EighthInch_Stereo_PJ366ST | J1 |
| 1 | LineIn2 | 4ms_Jack:EighthInch_Stereo_PJ366ST | J2 |
| 1 | Out_L | 4ms_Jack:EighthInch_PJ398SM | J5 |
| 1 | Out_R | 4ms_Jack:EighthInch_PJ398SM | J6 |
| 1 | Output_Norm | 4ms_Connector:Pins_2x03_2.54mm_TH | J8 |
| 1 | TL072 | 4ms_Package_SOIC:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U1 |
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Questions
How big is the IRONMix PCB?
It measures 61.4 × 110.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the IRONMix use?
97 parts, built around the NE5532, OPA1642AID, TL072 and B5817W. 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 IRONMix KiCad files?
From the VoltageFoundryMod/IRONMix repository on GitHub, at the commit this page was made from: the board is IRONMix.kicad_pcb and its schematic IRONMix.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the IRONMix design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).