About 3.5mm Audio jack

Audio jack Pinout

The 3.5mm audio jack, also commonly called the 1/8 inch jack, is a small and popular audio connector designed for solderless connections. This connector was first designed by the French company "Sony" in the 1950s. It was first used in radios and then in music systems for stereo audio listening. It is preferred for small size and high quality sound transmission, such as headphones, insulated wires and straps. 3.5mm audio jack This is a male plug jack used for audio, it is used in our earphones, headphones and many other places. There are many types of these. Such as: mono plug, stereo plug, 4 pole stereo plug, balance mono plug, universal 4 pole stereo plug (headphones audio jack), Audio/Video 4 pole plug.

Wires Color Codes

• GREEN WIRE: Right Audio Output
• BLUE WIRE: Left Audio Output 
• RED WIRE: Positive for Microphone
• BLACK WIRE: Stereo Out, Rear channel
• GOLDEN WIRE: Ground Wire, center & Subwoofer 

See how it is connected to our headphones or earphones in the image below.

Earphone circuit diagram

The 3.5mm Audio/Video 4 pole plug, commonly used in audio and video, typically has four connections or poles. These connections serve different purposes:

1. Tip (T): Usually for the left audio channel.

2. Ring (R1): Often for the right audio channel.

3. Ring (R2): Sometimes used for microphone input and for subwoofers.

4. Sleeve (S): Ground or common return for all signals.

These plugs are versatile and can carry stereo audio signals along with microphone input, making them useful for headphones, headsets, and other audio devices that require both audio output and input functionalities. See the detail in the image below.

Audio/Video 4 pole plug.