So I was doing some audio tests with pepper, and noticed I could hear some switching noise on the audio.
(Including some of the pepper demo patches, on both my peppers)
I think the reason is as the audio out is only 1.8vpp, I’m running it through a module to gain it quite significantly - which is why I think it becomes audible.
One thing I want to play with is ensuring the signal from the patch is ‘normalized’ , to ensure I get a high SNR - as I suspect that will help quite a bit.
But I’m wondering if there are other suggestions?
I had this when using the belamini with ae modular and solved it with a large inductor on the power line , but I’m not sure that’s necessary here as I’ve only heard the noise thru the pepper out not (fortunately) interesting with other modules.
I half remember something about turning bbb leds off, but noise down not seem to sync to those, so seems unlikely to help.
Thoughts ? Anyone else noticed this?
I’m running off 12v with regulator.
Salt in the same rack has no noise.