Audio Jack 3.5mm - PRT-08032 - SparkFun Electronics

Low profile 3.5mm stereo audio jack.

Connector Basics - SparkFun Learn

Audio Jack 3.5mm - PRT-08032 - SparkFun Electronics

3.5mm Audio Jack Adapter - RobotShop

Audio Jack - 1/4 Stereo (right angle) - COM-11144 - SparkFun Electronics

SparkFun MP3 Breakout - VS1033D - BOB-10608 - SparkFun Electronics

Audio Splitter 3.5mm - 6in - CAB-08920 - SparkFun Electronics

Audio Adapter - 1/4 to 3.5 mm Stereo - COM-11149 - SparkFun Electronics

Wholesale Stereo 4p Jack 3.5mm Products at Factory Prices from Manufacturers in China, India, Korea, etc.

Connector Basics - SparkFun Learn

Graphic Equalizer Display Filter - MSGEQ7 - COM-10468 - SparkFun Electronics