This DFRobot 386AMP audio amplifier module uses the National Semiconductor LM386 audio power amplifier chip.  It has 20 voltage gain. In the 6V power supply, it's static power consumption of only 24mW, the module is suitable for battery-powered...

This is a 3.5mm male to 2.5mm female audio jack converter.

This is a 3.5mm male to male audio jack connection cable that runs 3 foot.

This breaks the 3.5mm audio male to female micrphone and headphon. The definition of the audio male is CTIA, which is what apple using.     It turns out that the audio jack of pcDuino3 follows OMTP standard, while Apple...

How many times have you been listening to your MP3 player or watching a video on your computer and wished you could have a friend listen or watch along with you? The 3.5mm Audio Jack Splitter makes that dream a reality. Simply plug the male end of this...

There are two definition of audio jack, OMTP and CTIA.   It turns out that the audio jack of pcDuino3 follows OMTP standard, while Apple follows CTIA/AHJ standard.  The definitions of the two different standards are reproduced here...

This ia an audio jack converter that converts 2.5mm to 3.mm audio connectors and vice verse.