Guru
Joined: 05/10/2019
Location: United KingdomPosts: 7433
| Posted: 10:31am 17 Mar 2023 |
Make sure that any PAM8403 modules (or any digital amplifiers for that matter) that you are using have output inductors on them. Some of them omit these to keep the costs down, but the penalty is that they are quite capable of spitting out anything up to RF frequencies. You can't hear these, obviously, but they do radiate and can get back into the circuit feeding them for further amplification. The result can be a big spike, heard as a clicking noise. I'm not saying that this is the case here, but it's something to bear in mind.