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Convert Airport Express from AC to USB powered. This enables AirPlay in car for high definition wireless audio. AirPlay transmits using a lossless codec (Apple Lossless) at CD resolution (44Khz-16bit) which is much better than the lossy compression that bluetooth uses.
Before modifying anything, make sure the airport express works. Visit goo.gl/zbnm6i for information on how to setup airport express and iPhone so that iPhone stays connected to LTE while streaming music over AirPlay.
Steps:
1. Open Airport Express and remove power supply.
2. Use a spare USB cable as a power cable. I used a 30 pin iPhone cable and cut off the 30 pin connector. Locate the positive and ground cables and test them using voltmeter.
3. Connect USB cable to step-down module. I used www.ebay.ca/itm/DC-5V-to-3-3V-...
4. Connect step-down module to the airport express logic board.
5. Test airplay.
6. Solder everything in place.
7. Close the bottom cover of the airport express and cover the unused ports on it.
8. Connect it to the USB power outlet in car and connect aux cable from airport express to car. If the car does not have a USB connection, use a 12v to USB converter (www.ebay.ca/itm/New-Dual-Car-C...)
9. Test AirPlay.