3.5mm audio jack Pinout

jack's picture


Joined: Sep 21, 2018

Replies: 2
3.5mm audio jack Pinout
September 21, 2018 - 6:23pm

hey can anybody help me with this...

i am designing a audio transfer circuit so i need to connect the 3.5mm jack to my mobile... so there are three wires from the circuit which needs to connect to the 3.5mm jack.. left, right and ground but i dont know the pinout or wiring for 3.5mm jack..

i also want to know is there is any operating voltage for the audio jacks... and is there is any voltage of coming audio signal, if it is then how it will increase or decrease.. 

and what are possible ways to transfer audio signal wirelessly, except bluetooth..?

Aswinth Raj's picture


Joined: Aug 16, 2016

Replies: 987

Hi Jack, welcome to circuit digest forums.

The pinout of a 3.5mm audio jack is shown below


As you said there will be three wires coming out for a generic jack. Use the multimeter in connectivity mode to check which wire is Left, right and Ground. A strict colour coding is not followed for these connectors.

There is no such thing called operating voltage for a 3.5mm jack, but normally the audio signal voltage when analyzed through scope  would have a maximum peak of 1.5V to 3V based in the device and volume. 

Signals can be transmitted wirelessly in many ways what do you want exactly? What are you working on? 


Next time when using forums, makes sure the questions stay more focused on one topic. If you have more than one question post them as different threads