I am adding a speaker protection circuit board to my NBAFB to eliminate the speaker pop on startup/shutdown. It works, but the delay isn't quite long enough to cover all of the pops. Does anyone know how I might make the delay longer? I don't know enough about it to know if swapping out component values would achieve this.

Any thoughts? I appreciate the help.

The board I'm using:

PXL_20210703_173953915-1 (resized).jpg
PXL_20210703_174004990 (resized).jpg

Bump and update. Cheers!

Thanks, Ed. Appreciate your knowledge, as always. I'm gonna hunt down a slightly higher value cap for C2 as you mentioned, and might as well swap out those other two for better quality ones as well We'll see how it goes!

I assume there is a point of diminishing returns with the higher value caps? If not, I guess it could just be a matter of finding a cap value that gets me the best delay outcome.

Right on, thanks. I'll replace these caps for now (going with a 68uF to replace the 47uF) and we'll see what kind of time delay increase we can get. Will post updates once they arrive. Cheers.