DIY Audio Isolator for Car RCA Noise Fix

If you are interested in a DIY audio isolator, you might want to take a look at this article.

If you have modified your car’s Android head unit to low-level RCA output and are suffering from severe interference noise, which is likely caused by common-ground interference, and even adding an isolated power supply does not help, you may feel very frustrated, at which point you might suddenly come up with the idea of DIYing an audio isolator yourself.

If you happen to have four Siemens permalloy transformers with a 600:2.4k ratio, eight pure copper gold-plated RCA female connectors, an aluminum alloy enclosure, and a perfboard, and the perfboard has eight 11mm diameter holes, then you can start building it yourself.

The dimensions fit perfectly.

You start soldering, and you can use silver-plated wire for the connections.

The wiring may look a bit messy, but as long as it does not affect functionality, it is acceptable.

This is the finished product after soldering.

You then install the top cover, and the build is complete.

You can connect it to your car and test it, and you will find that the common-ground interference noise is completely eliminated. However, since it is an isolation transformer, the soundstage becomes slightly narrower, and the low-frequency response is somewhat reduced, but everything else still performs quite well.

Completed.