How to get rid of squeaking in headphones?

Question

Headphones

Welcome all.

There are wireless bluetooth headphones (full size).

The problem is the following - during the playback of sounds and within 10 seconds after stopping, a squeak is clearly heard from the right earpiece (where the board is located). That is, I start to reproduce the sound - they squeak, I pause - it continues to squeak for 10 seconds and the squeak stops. I turn on playback again - it starts beeping. Also, a squeak appears for 10 seconds when connected.

The problem is observed only when paired with smartphones (I tried different ones). When paired with a PC, the sound is clear, there are no extraneous noises.

At first I thought that the matter was in the microphone - I soldered it, but the squeak did not disappear. Soldered it back.

Then I noticed that the squeak completely disappears if you take the speaker away from the board at least 1.5-2 cm.

What are the options to get rid of the squeak in this case?

Answer 1

Directions from the antenna to the speaker. Try shielding the speaker from the board with foil or a metal plate, you can also connect it to ground on the board.