Hobby audio player project noise problem

[huseyin34]

Hi everyone,

I'm new in here. I designed a controller card project and the card can switch some devices with relays, dfplayer mini to play sounds from sdcard, external bluetooth music player card is connected to the circuit. cd4066 used for audio switching between dfplayer and Bluetooth audio. But there is noise in audio. 12volt power supply is used with 7805 regulator. Bluetooth Audio and amplifier also uses same power sources from the board. Can you please review my circuit ?

 

[Bluejets]

What you provided above is not a "circuit diagram" but a pcb layout and as such, difficult to interpret.
I would imagine though with audio, you have not considered noise injection from such things as power supply and having necessary ground shielding where required.

 

[davenn]

Can you please review my circuit ?

As Bluejets said ....
Can you please provide a circuit diagram

 

[huseyin34]

Sorry. I added the circuit now

 

[kellys_eye]

There's no ground on the audio input blocks.

 

[huseyin34]

Where should I connect the ground ? Can I connect to the any ground point ?

 

[Delta Prime]

Where should I connect the ground ? Can I connect to the any ground point ?

Welcome to Maker Pro. This is all very new to me...
Clarification please.

I designed a controller card project and the card can switch some devices with relays, dfplayer mini to play sounds from sdcard, external bluetooth music player card is connected to the circuit.

Is this a prank?
You designed it.

 

[huseyin34]

There is noise problem in the sound. This is my first PCB. So this is why I asked.

 

[huseyin34]

What you provided above is not a "circuit diagram" but a pcb layout and as such, difficult to interpret.
I would imagine though with audio, you have not considered noise injection from such things as power supply and having necessary ground shielding where required.

How can I apply ground sheilding. I'm newbie

 

[Harald Kapp]

How can I apply ground sheilding

https://www.celeramotion.com/microe/wp-content/uploads/sites/2/2019/05/TN-1202_Grounding_and_Shielding_Recommendations.pdf

There's no ground on the audio input blocks.

@kellys_eye : You mean here?

I'd say these are outputs, but nevertheless, GND is labeled but not connected.

 

[huseyin34]

https://www.celeramotion.com/microe/wp-content/uploads/sites/2/2019/05/TN-1202_Grounding_and_Shielding_Recommendations.pdf

@kellys_eye : You mean here?
View attachment 61851
I'd say these are outputs, but nevertheless, GND is labeled but not connected.

Thx. I think its ok now. Are there any possible errors here can u see ?