Hans

Audio noise issues

Recommended Posts

Hi,

 

when I power the RetroCade Synth through a USB port that is connected to my main Audio machine, I have audible audio interference (high-pitched hissing, noise).  This is independent of the USB port that I use, either directly on the machine or on a hub.  When I power the synth through an external power supply, that noise is not present.  I wonder if there is a way to get rid of this?  Is this because the ground plane of the USB, by the way of the USB cable powering the board, is shared with the audio ground plane of the output jacks?

 

I would like to keep the board connected to my computer so that I can reconfigure it and experiment with sketch changes, but the noise makes it kind of impractical.

 

Any help would be appreciated!

 

Thanks,

Hans

Share this post


Link to post
Share on other sites

Hans,

 

This is strange, I'm not sure what could be causing this issue. Can you try to power it through a USB Hub? Particularly a powered USB Hub?

 

Thanks,
Jack.

Share this post


Link to post
Share on other sites

Hi Hans,

 

I´ve the same issue like you,

 

but if I switch from the "Welcome" Screen via Joystick to the next menu , the noise is off.

 

I recognized, that the noises comes from the animated "Space invader" on the start screen...

 

 

andY

Share this post


Link to post
Share on other sites

Jack,

 

I tried powering the board both through a high-quality powered USB hub and through a direct USB port on the machine.  With both, the noise was clearly audible.  When I used an external power supply, there was no issue.  In a performance situation, there'd be no issue with using a separate power supply, but for development, the approach won't work.  I'll try powering from an extra laptop tomorrow, just for another data point.

 

I kind of suspect a ground connection issue, but I'm not much of an electronics buff.

 

-Hans

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now