Headphone Jack Wiring, Connection, Terminals, PinOut, Color Codes

Hey, in this article, we are going to discuss about headphone phones. There are two types of headphones widely used for headphones, earphones, audio cables, aux cables. These two types are - TRS and TRRS Jack. TRS jack or TRS audio plug is also known as 3 pole or 3 wire jack. TRRS jack or TRRS audio plug is also known as 4 pole or 4 wire jack. Actually, this is a headphone plug about which we are talking. Most of the people told it as the headphone jack. This is wrong. The headphone jack is the female connector that is placed in devices such as mobile phones, laptops, computers where the headphone jack or male connector is plugged. Headphone plugs are used with headphones, earphones, aux cables, etc. According to the size, there are different types of headphone plugs such as 2.5mm, 3.5mm, 6.5mm, etc.

Three Pole or Three Wire Headphone Jack - TRS

Here, you can see the terminal identification of the TRS(Tip-Ring-Sleeve) Headphone plug or audio plug.

You can see there are three sections in the plug - the Tip carries the left channel audio signals, the Ring carries the right channel audio signal, and the Sleeve carries the ground signal for both audio channels. TRS headphone audio plug mostly used with Aux Cables, Audio cables, and old headphones. It has no microphone features. The common colour codes used for the headphone jack terminals are Blue, Red, and Green. But the different manufacturers use different colour codes. Here, green is for the ground signal, red is for the right audio signal and blue is for the left audio signal.

4 Pole or 4 Wire Headphone Jack Terminals - TRRS

Here, you can see the terminals of TRRS audio plug.

You can see it has four sections. The Tip carries the left channel audio signal, the upper ring carries the right channel audio signal, the lower ring is for the microphone, and the sleeve is for the ground signal. 

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TRRS Headphone Jack Colour Codes

Also, you can see there are four terminals of that audio plug. The red terminal is for right audio, the blue is for left audio, yellow is for MIC, and the green is for ground for all the audio channels and microphone. Again, I tell you, it is not standard for all. Different manufacturers use different colour codes. The blue terminal is connected to the Tip, the red terminal is connected to the upper ring, the yellow terminal is connected to the lower ring and the green terminal is connected to the sleeve.

Stereo Headphone Jack Wiring and Connection Diagram

Here, you can see the connection of a stereo headphone.

Here, you can see two speakers are there - the left speaker, and the right speaker. The left speaker has two terminals - blue and green. The Blue terminal is connected to the tip of the headphone plug and the green terminal is to the ground. The right speaker also has two terminals - red and green. Here also the green is for common ground and the red is connected to the upper ring of the headphone plug. The microphone has two terminals - yellow and green. A tactile switch is connected in parallel across the microphone terminals. The main function of that switch is to make a short between yellow and green terminals when it is pressed.

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