Adafruit 3.5mm (1/8") 4-Pole (TRRS) Audio Plug Terminal Block

One truth about working with audio is you always need the cable or adapter you don't have in your toolbox. That's why these terminal-block audio connectors are so practical. No soldering required! Use stranded or solid core wire and a small screwdriver to create custom wiring jigs.

This is the 3.5mm (1/8") 4-Pole (TRRS) Audio Plug Terminal Block. TRRS stands for Tip, Ring, Ring, Sleeve. It has four total conductors—three signal and a ground—as opposed to the more common stereo jack's two.

This connector is most often used in smartphones and cellphones to provide stereo audio and one mic channel. On a Raspberry Pi, the extra connector is used for composite video.

Note that the green block labels it as GND-blank-Right-Left, which is the most commonly used order. However, it would be more technically correct to just label it Sleeve-Ring-Ring-Tip: this goes in the same order as the four contacts on the plug. Options may include nickel or gold-plated contacts. A matching 4-Pole Audio Jack Terminal Block is also available!