Results 1 to 2 of 2

Thread: Hauppage USB TV/FM line-in noise/whine- Grounding

  1. #1
    Constant Bitrate
    Join Date
    Mar 2004

    Hauppage USB TV/FM line-in noise/whine- Grounding

    Hi there,

    ive got my PC setup in the boot. Nicely grounded etc etc no problems on that front with noise. I have 2 4 port USB2 hubs which are under my dash which are joined by 2x 5m extension leads to the PC in the boot. Under the dash i have my Hauppage USB TV/FM tuner. The line out from it then runs down the car via RCAs to the linein of the sound card. Now the problem i have is when the linout volume it about 50% i get whine when the cars running. I know this is a grounding issue, as when i rest just the outside of the USB plug on the metal on the usb hub ports i get he noise.

    Its because the hauppage is tryign to ground itself down the RCAs as there is a difference in resistance of the USB ground to the PC and down the phonos. With car audio kits its aways best to keep the grounds short.

    Would it be OK to somehow on the hauppage disconnect the USB grounds from the ciruit board so it didnt use the usb cables ground and instead have a tag that comes out of the hauppage that i connect via a short lead to a decent ground on the chassis on the CAR body, EG like a head unit would be connected?

    Anyone else have this problem with USB audio devices and noise



  2. #2
    Constant Bitrate
    Join Date
    Mar 2004
    no techheads gonna help me?

Similar Threads

  1. Problem with ITPS / hibernation and External USB HD
    By veetid in forum Power Supplies
    Replies: 5
    Last Post: 01-02-2006, 09:35 PM
  2. USB TV/FM with SDK?
    By Lucifer in forum Software & Software Development
    Replies: 5
    Last Post: 01-07-2005, 09:40 AM
  3. usb tv/fm thingymado
    By Weatherboy in forum Input Devices
    Replies: 3
    Last Post: 09-08-2004, 12:01 AM
  4. tv/fm usb card recommendation?
    By robr in forum MediaCar
    Replies: 1
    Last Post: 05-04-2004, 12:41 PM
  5. DIY: USB audio line out?
    By Machs_FueL in forum General Hardware Discussion
    Replies: 2
    Last Post: 12-03-2001, 07:00 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts