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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