lm1875 white noise problem

[matej123]

HI guys, I created an amplifier using lm1875 chip using the scheme in attached files. When I used the pc jack as an input there was a little bit of noise but nothing terrible. But recently I bought a sound interface "Komplete audio 2" and when I plugged it in, my speakers make terribly loud white noise. i think it could be a high gain issue but i'm not sure so can you please help me.

 

[Osvaldo de Banfield]

PC is inherently a noiser environment. Check anorher source: a phone, a radio, a portable CD, etc to discriminate where the problem is. It may be supersonic oscillating or simply amplfying noise.

 

[matej123]

PC is inherently a noiser environment. Check anorher source: a phone, a radio, a portable CD, etc to discriminate where the problem is. It may be supersonic oscillating or simply amplfying noise.

The noise is there only when I use the sound interface

 

[Bare]

Welll then, the solution is Obvious: Don't use the Noisy interface contraption.

 

[TNT]

Have you been able to play it noise less with any source?

//

 

[steveguo]

Welll then, the solution is Obvious: Don't use the Noisy interface contraption.

I think you can try this

 

[AIM65]

The noise is there only when I use the sound interface

your amp as sym input, do you use the line out of the interface ( backside) ? Not the headphone one ?

Do you have a way to confirm that the interface is not the cause of the issue ?

 

[matej123]

your amp as sym input, do you use the line out of the interface ( backside) ? Not the headphone one ?

Do you have a way to confirm that the interface is not the cause of the issue ?

Yes i was using the backside