DIY Bluetooth Receiver: Convert Car MP3 to Wired Audio

If there The Bluetooth player in the car is receiving distorted audio signals, severely affecting sound quality. How should this be resolved?

Perhaps try transforming it into a Bluetooth to wired receiver:

1. For the car player, separate the DC-DC section from the mainboard.

2. Remove the FM modulation IC and surrounding components. Connect a 5V power supply and test with wired speakers to determine if the distortion is due to FM transmission or the Bluetooth chip itself. Testing shows sound quality is decent with distortion completely eliminated.

3. Start with a new, unused Samsung charger and extract its power board.

4. Find a similarly sized plastic case and securely attach the upper part of the car Bluetooth receiver using 704 adhesive. This preserves original functions like song switching, phone calls, and volume adjustment. Use iron weights to prevent displacement and allow 12 hours for curing.

5. Install a 3.5mm socket and power board inside the plastic case, solder connection wires, and use 704 for stability.

6. Once the adhesive has fully cured, connect the audio jack to the wired speaker—DIY project complete.