The 3.5mm TRS (Tip-Ring-Sleeve) jack is the most common headphone and personal audio connector. Tip = left channel, Ring = right channel, Sleeve = ground. Found on virtually all consumer audio devices.
| Pin | Name | Function | Type |
|---|---|---|---|
| T | Tip | Left audio channel positive | ADC |
| R | Ring | Right audio channel positive | ADC |
| S | Sleeve | Common ground / return | GND |