I'm having a problem with a weird audible noise in my sound player circuit.. It's due to an interference with a LED strip.
I've used this circuit (Arduino + DFplayer + Amplified Mini Speaker) many times but since I decided to add a LED strip to the circuit, a very loud noise (which sounds like high frequency strings) appeared..
I've tried to use a 104 capacitor with 270ohm resistor to create a filter, but it didn't work.
Maybe a diode with a capacitor somewhere??
Could anyone give me some suggestions to fix this?
Many thanks in advance! Ian