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The CJMCU-TRRS 3.5mm Audio Jack AV Stereo Breakout Module is a highly efficient passive utility board designed to simplify audio routing and analog signal acquisition. Standard auxiliary ports use TRS (Tip, Ring, Sleeve) connections which limit hardware strictly to left-and-right stereo paths. The TRRS layout on this board adds a fourth independent channel, unlocking the ability to stream dual-channel audio alongside a microphone channel (like modern smartphone headsets) or route analog composite video signals alongside stereo audio (common in older media players and single-board computers).

Manufactured on a high-grade, dual-layer FR4 PCB with clean solder pads, the module features clear, silkscreen-printed terminal labels matching the internal contacts of the female jack socket. By re-routing these micro-contacts to a linear 0.1" (2.54mm) pin header, developers can drop this module straight into breadboards or solder ribbon cables to it without fighting the odd footprint structures of bare plastic audio jacks.

Key Features & Benefits:

• True TRRS 4-Conductor Framework: Breaks out the Tip (T), Ring 1 (R1), Ring 2 (R2), and Sleeve (S) terminals, offering complete cross-compatibility with CTIA and OMTP headset standards.

• Breadboard-Friendly Form Factor: Fits seamlessly into standard spacing arrangements, eliminating loose flying wires and fragile hand-soldered connections on structural points.

• Completely Passive Design: Operates entirely on analog signal-level routing with zero active silicon, generating no added signal distortion, frequency noise, or voltage dependencies.

• Includes Straight Male Header Pins: Bundled with a high-quality 6x1 straight breakable berg pin strip to get you prototyping right out of the box.

Technical Specifications

How to Use & Pinout Standardizations

⚠️ PINOUT ATTENTION: There are two competing commercial standards for 3.5mm smartphone headsets: CTIA (used by Apple, modern Android devices) and OMTP (older Nokia/Samsung setups). They swap the physical positions of the Microphone and Ground lines. Always check your headset's pinout specification before wiring the module to prevent common audio hiss or low microphone levels.

Physical Pinout Connections (Labeled on Board):

• T (TIP): Typically paths Left Audio Channel (or Composite Video output on some multi-media setups).

• R1 (RING 1): Typically paths Right Audio Channel.

• R2 (RING 2): Microphone Signal Line (under CTIA standard) OR Ground Common Line (under OMTP standard).

• S (SLEEVE): Ground Common Line (under CTIA standard) OR Microphone Signal Line (under OMTP standard).

Quick Prototyping Steps:

1. Solder the included 4-pin male header row onto the breakout board's labeled edge pads.

2. Insert the module into your solderless breadboard.

3. For a standard modern smartphone headset input (CTIA standard): Connect S to your system ground (GND), T to your left-channel audio filter/amplifier, and R1 to your right-channel audio path.

Applications

• Custom DIY Audio Headsets & Amplifiers: Integrates mobile phone headsets easily into analog synthesizers, microphone pre-amps, and custom sound boards.

• Raspberry Pi Retro-Gaming AV Projects: Pulls the multi-pole analog composite video and audio output signals cleanly from the Raspberry Pi's on-board audio jack.

• Microcontroller Speech Processing: Bridges analog microphone signals from modern headsets into microcontroller ADC processing blocks for voice-recognition training.

• Smart Home Intercom & Walkie-Talkie Prototypes: Connects multi-line communication headsets to cellular breakout boards or radio transceiver chips.

Package Includes

• 1 x CJMCU-TRRS 3.5mm Audio Jack AV Stereo Breakout Module

• 1 x Straight 4-Pin 0.1" (2.54mm) Pitch Solder Male Header Strip

Shipping & Delivery

• Free shipping on all product orders above ₹999 across India

• Dispatched promptly within 1-3 business days

• Expected transit delivery times: Metro regions: 1-3 days; Other areas: 3-7 business days

• Packaged safely with protective padding to ensure the physical structural alignment of the socket assembly remains perfect during transit