Every time I build an audio project I get an electric noise or a long beep on the audio output like the headphone out. This time Im working with an MP3 player that requires a 100uf capacitor in series with the line out. The noise is annoying?
Whats the problem? Grounding? Need to add extra components?
This is the mp3 im using
http://www.elechouse.com/elechouse/images/product/USB-SD MP3 Modules/WT9501M03.pdf

The circuit is on the pdf file at the bottom.
The noise is a noise! Like a long beep
Thanks!

 

My car has a noisy engine. What's the problem?

Like that question I can't answer yours without more info.---

What type of noise are you having?

Show a diagram of how you are connecting it.

 

My car has a noisy engine. What's the problem?

Like that question I can't answer yours without more info.---

What type of noise are you having?

Show a diagram of how you are connecting it.

mp3 circuit

 

Your 5V supply is noisy.

 

Thanks Mr chips! So if is 5v power supply which one do I need that will not make noise?
Crutschow I did post the circuit is very simple and the noise is like a beep I told you many times.

 

To test if noise is coming from the power supply, replace the power supply with a battery.

 

Can we hear a recording of the noise just in case it's some kind of feedback you're hearing?

 

OK so what I learn is that never connect the audio ground to the power supply ground (-) it will make a noise. The audio ground must be connecter to the GND of the audio source (mp3 player, mixer board...).
I know is an onvious thing to do for you guys but it wasn't for me.
Thank you all!
Luis