Ever had a chance to have some of these noise cancelling headset from airplanes?
Here are some details on my quest on converting this three prong headphone to ordinary 3.5mm stereo headphone jack for computer/laptop or any portable devices such as cellphones and other music players.
Step 1: Gather Required Materials
We need the following materials:
1. 3.5 mm stereo phone jack - I only have angled jack during construction of this project
2. USB connector - I got it from old mouse. This will be used as power supply for noise cancelling function.
3. Various sizes of heat shrinkable tubing - it is used as isolation and protection
4. Solder leads
and the following tools:
1. Soldering Iron
2. Wire cutter
Step 2: Prepare the USB Cord
Set the multimeter to voltmeter mode and verify that the USB connector is working fine. You will measure 5 volts accross the red and black wire
Red wire = V+ positive 5 Vdc
Black = V- negative connection
Step 3: Indentify Headphone Wiring
Using a multimeter set to continuity mode I have identified the following pinout:
Blue = Audio ground
Brown = V+ positive supply for noise cancelling (I have read somewhere that it can work as low as 3V to 5V)
Gray = Left audio channel
Red = Right audio channel
Green = V- negative supply of noise canceller
Step 4: Connecting Power
Connect the USB cord to corresponding connection
Red to Green
Black to Brown
Test the headphone by sliding the switch on the left side. The LED should light up.
Step 5: Connect the Remaining Wires
Solder the rest of the remaining wires to each respective terminals.
Make sure that none of the wires are touching each other by properly insulating each connection.
I have used shrinkable tubing for insulation and protection.
Step 6: Testing Your Headset
Test your headset first before securing the cover of the stereo jack.
Time to enjoy your noise cancelling headset!