If you're interested in DIY Bluetooth headphone amps, you might want to check out this article. Nowadays, most phones don't have a 3.5mm headphone jack anymore, which makes wired headphones pretty much useless. Some cheap wireless headphones don't sound as good as affordable wired ones, and the higher-quality wireless options are usually expensive. Plus, most of them are in-ear designs, which can get uncomfortable after wearing them for a while.

If you've been thinking along these lines and happen to have some unused wired headphones lying around, why not follow this guide to DIY a Bluetooth headphone amp and put your old wired headphones to good use?

You'll need a Bluetooth board and a small charging board. As for the battery, you can even use an old one if you have one at home. Bluetooth boards are very power-efficient, so an old battery is usually enough—you can charge it once and listen for a whole week. In terms of sound quality, we're talking MP3s here; Bluetooth isn't the bottleneck. Unless you listen to a lot of lossless files and want higher fidelity, this board is more than enough.

The Bluetooth board has a micro USB interface.

If you don't want to swap it for a Type-C charging board, that's fine.

Next, you need to find an old battery and a case to put everything in, like in the picture below.

Then, you'll need to cut a hole on the side of the case.

Use hot glue to secure everything. If you're not using a switch, you can just wire it directly—the power consumption is really low, and it can stay on standby for a week without any issues. This way, you don't have to keep disconnecting wires all the time.

Finally, close the case, and you're done.

Now you can plug in your headphones, enjoy zero background noise, and get sound quality that's perfect for MP3s. It's simple, practical, and great for everyday listening.

Done!