Search found 4 matches

by slrkt
Fri Mar 30, 2007 12:40 pm
Forum: General Discussion
Topic: Noise problem
Replies: 12
Views: 2714

Its coming thru the power circuit so opto isolation is not an option.
by slrkt
Fri Mar 23, 2007 1:42 pm
Forum: General Discussion
Topic: Noise problem
Replies: 12
Views: 2714

One thing I failed to mention is the audio signal originates from the PC and connectes to the audio adapter board (basically a pre-amp) via a 3.5mm male to male patch cord. As I wrote before if I switch to an external power supply the noise goes away.
by slrkt
Thu Mar 22, 2007 7:46 pm
Forum: General Discussion
Topic: Noise problem
Replies: 12
Views: 2714

Thanks for all the input. I did try an off the shelf car audio noise filter with no improvement. I'll give it another go (funny how things work when you try them the second time). But my gut feeling is the noise in in a different frequency range if that makes any sense. I had a similar plan regardin...
by slrkt
Thu Mar 22, 2007 10:55 am
Forum: General Discussion
Topic: Noise problem
Replies: 12
Views: 2714

Noise problem

Need help with a noise problem. I am powering an audio adapter board via the 5&12vdc output from a small touch screen PC. The problem I have is when I play audio thru my adapter board there is an audible noise coming thru from the PC. I have confirmed its coming from the PC's power output by way of ...