Overview
The MX4I1 – Passive Audio Controller Board is a compact, power-free audio routing module designed for both splitting and mixing stereo line-level audio signals. It features three independent B100K stereo potentiometers (Master, CH1, CH2), RCA connectors, and 3.5mm stereo jacks for maximum compatibility.
The board supports two modes:
Case 1: Splitter Mode – Master input distributed to CH1 and CH2
Case 2: Mixer Mode – CH1 and CH2 combined into Master output
Each channel includes series 100Ω isolation resistors on Left and Right, protecting sources from loading issues during passive mixing.
Perfect for home audio, DIY projects, amplifiers, audio routing panels, and field audio setups.
Features
- Fully passive operation, no power required
- 3× B100K stereo potentiometers (Master, CH1, CH2)
- 4× 3.5mm TRS female jacks
- 2× RCA stereo ports (Master & CH2)
- Stereo Left/Right isolation resistors (100 Ω) on CH1 and CH2
- Supports passive splitting and passive mixing
- Independent level control on all three channels
- Low-noise routing with clean ground reference
- Works with any line-level audio source
- Compact PCB with mounting points
- Ideal for DIY audio, custom sound systems, and studio patching
Applications
- Line-level stereo signal splitting
- Passive stereo signal mixing (2-in to 1-out)
- Multi-device audio distribution
- Volume control before amplifier inputs
- Routing console for hobby electronics projects
- Home audio setups / sub-mixing
- Portable DJ / podcast splitters
- Line-level noise-free patch panel
Purchase Link
Download the Gerber files here: MX4I1 – Passive Audio Controller Board
Functional Description
All the ports act as IN or OUT depending on the use cases.
Master Channel
- Includes 1× B100K stereo pot for master volume
- Includes 1× 3.5 mm stereo jack
- Includes 1× RCA stereo port
CH1 Channel
- Includes 2× 3.5 mm stereo female jacks
- Controlled by 1× B100K stereo pot
- Operates as input or output depending on mode
CH2 Channel
- Includes 1× 3.5 mm stereo female jack
- Includes 1× RCA stereo port
- Volume controlled by 1× B100K stereo pot
Passive Splitter Mode
Master to CH1 / CH2
- Master signal is controlled via Master VOL
- CH1 and CH2 receive the same source
- Volume of each channel is independent
- No loading issues due to series resistors
Passive Mixer Mode
CH1 + CH2 to Master
- CH1 and CH2 signals enter through their jacks
- 100 Ω resistors prevent direct shorting between sources
- Master outputs combined/mixed audio
- Master pot controls final output level
Example Application
Splitter Mode
You can use the MX4I1 – Passive Audio Controller in Splitter Mode to feed audio to both your active subwoofer and stereo speakers from a single audio source (PC, TV, DAC, phone, etc).
Mixer Mode
Combine two audio sources (Example: PC + Phone) into a single mixed output for speakers, headphones, streaming setup, etc.
Technical Specifications
Parameter | Value |
Operation | Passive (No power required) |
Channels | Master, CH1, CH2 |
Audio Type | Stereo (L / R) |
Potentiometers | 3× B100K Stereo (Master, CH1, CH2) |
Connectors | 4× 3.5mm TRS jacks, 2× RCA stereo |
Series Isolation Resistors | 100 Ω (CH1 L/R, CH2 L/R) |
PCB Layout & Dimension
Parameter | Value |
Board Size | 42mm x 100mm |
Layers | 2 |
Components Placement | Top layer (Single side) |
Schematics
Revision History
Date | Version | Modify Content |
30/11/2025 | Rev 1.0 | New |
Get you Datasheet in PDF
Passive Audio Controller Board Gerber Files – MX4I1 | Audio Splitter Board
Original price was: ₹499.00.₹299.00Current price is: ₹299.00.
Passive Audio Controller Board Gerber Files for a stereo splitter and mixer with master and dual channel volume control. Fully passive design, no power required. Ideal for DIY audio, amplifiers, and line-level audio routing projects.
Description
Disclaimer (Digital Product)
This product is a digital production pack, not a physical or assembled PCB. You will receive Gerber files, BOM, Schematics and documentation required to manufacture the PCB Module. No physical boards are shipped.
Download Product Datasheet: Download Now
Overview
Passive Audio Controller Board is a compact passive stereo audio splitter and mixer designed for line-level audio routing. This board allows you to split one audio source into two outputs or mix two audio sources into a single output using a fully passive design with no external power required.
The board features three independent B100K stereo potentiometers for Master, CH1, and CH2 volume control, giving precise level adjustment for each channel. With a combination of 3.5mm TRS audio jacks and RCA connectors, the MX4I1 supports a wide range of audio devices including PCs, phones, DACs, mixers, active speakers, subwoofers, and amplifiers.
For safe and clean passive mixing, 100Ω series isolation resistors are included on the Left and Right channels of CH1 and CH2. These resistors prevent signal shorting and loading issues when multiple audio sources are connected simultaneously, ensuring stable and distortion-free operation.
Key Highlights
- Passive stereo audio splitter & mixer (no power required)
- Splitter mode: 1 input → 2 outputs (Master → CH1 & CH2)
- Mixer mode: 2 inputs → 1 output (CH1 + CH2 → Master)
- 3× B100K stereo volume controls (Master, CH1, CH2)
- 4× 3.5mm TRS jacks + 2× RCA stereo ports
- 100Ω isolation resistors for safe passive mixing
- Works with all line-level audio sources
- Compact, low-noise PCB design
Typical Use Cases
- Connecting an active subwoofer and 2.0 speakers from one audio source
- Mixing PC and phone audio into a single speaker or amplifier input
- Passive volume control before amplifiers
- DIY audio routing panels and patch bays
- Podcasting, streaming, and recording setups
- Home audio and studio sub-mixing
The MX4I1 Passive Audio Controller Board is a simple, reliable, and noise-free solution for anyone needing analog audio splitting, mixing, or volume control—without the complexity of active circuits or power supplies.
What You Will Receive (Digital Download)
This product pack includes:
- PCB Gerber File
- Bill of Materials (BOM)
- Pick and Place (CPL)
- Full product datasheet
- Documentation pack (README, License, T&C)
These files can be directly uploaded to PCB manufacturers such as JLCPCB, PCBWay and other manufacturers for fabrication.
Why Use Passive Audio Controller Board (Digital Download)
Passive audio controller designs are widely used in DIY audio systems because they do not introduce noise, latency, or power-related interference. Using Passive Audio Controller Board, makers can manufacture a reliable audio splitter and mixer without active components or power supplies.
The MX4I1 design includes:
- Dedicated master volume control
- Individual channel attenuation
- Series isolation resistors for safe passive mixing
- Multiple connector options (RCA and 3.5mm)
These features make the board suitable for home audio systems, studio routing, portable audio setups, and custom enclosures. Since the board operates at line level, it is compatible with PCs, phones, DACs, mixers, amplifiers, active speakers, and subwoofers.
Technical Specifications
| Parameter | Value |
| Operation | Passive (No power required) |
| Channels | Master, CH1, CH2 |
| Audio Type | Stereo (L / R) |
| Potentiometers | 3× B100K Stereo (Master, CH1, CH2) |
| Connectors | 4× 3.5mm TRS jacks, 2× RCA stereo |
| Series Isolation Resistors | 100 Ω (CH1 L/R, CH2 L/R) |
PCB Layout & Dimension
| Parameter | Value |
| Board Size | 42mm x 100mm |
| Layers | 2 |
| Components Placement | Top layer (Single side) |
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