TRS Phono Plug

The audio jack that is commonly seen on stereo headphones, audio devices such as the iPod, and many cell phones is known as the TRS Connector. The TRS phono plug connector is an audio jack with either 2 or 3 rings. TRS is an acronym representing Tip + Ring + Sleeve. The 2 ring version is for mono audio and the three ring version is for stereo audio. There are also other variants such as a four ring version which is often designed for camcorders, the extra ring for the video signal.

Polarity

1. Sleeve: usually ground

2. Ring: Right-hand channel for stereo signals, negative phase for balanced mono signals, power supply for power-requiring mono signal sources

3. Tip: Left-hand channel for stereo signals, positive phase for balanced mono signals, signal line for unbalanced mono signals

4. Insulating rings

 

Sizes

1. Quarter Phono - common for band equipment, mixers, DJ equipment, and legacy headphone (studio).

2. Eight Phono - common for Walkman, portable audio, iPod, modern headphones and some newer mobile phones.

3. Three Thirty-Second - standard for mobile phone audio connector, however, eight is become more common on newer models.