BUZZ when connecting turntable to PC - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th December 2004, 11:30 AM   #1
raveon is offline raveon  Denmark
diyAudio Member
 
Join Date: Mar 2004
Location: Glostrup
Smile BUZZ when connecting turntable to PC

Hello out there.

I have a problem with noise when I connect my phono preamplifier to the soundcard in my pc.

Let's start with the signal chain:

Turntable>phonopreamp (NAD PP2)>Behringer UB802 mixer>soundcard (M-Audio 2496)

The problem is, that I get a buzz-noise, when I record to the HD.
According to Adobe Audition 1.5 (AA) this buzz is about -54dB. I can reduce the buzz to -84dB with noise reduction in AA, but I would much rather prefer not to. The less manipulation with the original signal the better.

When I pull out the cables from the turntable to the phonopreamp the buzz disappears (yes I do have a connection frem the turntable chassis to the the ground plug on the preamp).

The buzz also is absent, when I feed the mixer into my stereo setup. Even with the volume turned all the way up - with my ears close to the speaker - there is no buzz, just some hiss.

Connecting the mixeroutput to the soundcard on my laptop generates no buzz either, so I guess it is all a matter of grounding or groundloops.
The pc is not grounded - just live & neutral - but as far as I know: in the PSU there are to smallvalued capacitors, one from live and one from neutral connecting to the pc chassis, which is the signal ground too. That could be the problem? Or am I wrong?

Any suggestions to solving this irritating problem will be very appreciated.

Regards

raveon

"keep on rockin' in the free world"
  Reply With Quote
Old 7th December 2004, 08:18 PM   #2
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
Two things come to mind:

- AC pickup from your house wiring. In the colder months, more current is drawn because of heaters and festive lighting. This causes a greater AC magnetic field everywhere. Try re-orienting your turntable (rotate it, or move it about the room with the volume up and no record playing and look for a position of minimum hum). Try re-orienting the lay of your cables too.

- Ground loop. Do you have a way of lifting the ground to your soundcard from your phono pre without breaking the signal?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can Someone solve my buzz/Hum noise from turntable FSHZ:42 Everything Else 3 23rd March 2008 10:51 AM
Buzz in new amp... chrish Tubes / Valves 10 20th February 2008 04:06 AM
Melos triode and computer as source: BUZZ BUZZ BUZZ zigo3 Tubes / Valves 4 28th November 2007 02:11 AM
IGC 100 Hz buzz vmac011 Chip Amps 5 13th October 2004 06:20 AM
Can you help with my Buzz?? saurus Solid State 4 23rd September 2004 03:31 PM


New To Site? Need Help?

All times are GMT. The time now is 03:47 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2