What is that noise? (With video of the sound)

[tlhsglm]

Hi,

I'm trying to make a Bluetooth sound system. I've used jdy62 Bluetooth module and tda7850. A bit messy schematic is attached. Basically 220 v converted 12 volts via SMPS, that supplies 12v tda7850 amplifier module and converted 5v to supply Bluetooth module with help of lm2596 module.

Bluetooth modules l and r connected to tda7850's inputs . Also input ground is connected to the jdy62's ground.

Also I've added 104 ceramic cap and electrolytic 10uf cap parallel with jdy62's 5v input.

Video of the problem;( when phone is close to speaker you can hear sound like vidi vidi vidi vidi, that is the problem not hum sound its just the environment sound)

what is that noise

Also added ec2a01h for ground loop isolation but nothing changed. Maybe a little, maybe.

[sonofcy]

Most likely electrical noise. Google how to reduce electrical noise.

[tlhsglm]

Do you mean rc filters can handle this?

[sonofcy]

Most likely, can't hurt to try.

[tlhsglm]

Okay I will try it in couple hours thanks.

I wonder, if I make a high pass filter to eliminate that noise, is it block the music signal in that noise frequency range?

[sonofcy]

Why would it, you don't put the filter on the audio line, you out it on the DC lines since the noise originates in the SMPS. OR switch to a Linear PS.

[tlhsglm]

Oh yes true my bad. Thanks. This photo from oscilloscope view in ac mode.5v input of Bluetooth.