Cable related hum - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 23rd May 2005, 02:00 PM   #21
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Harry,
I was talking about any audio or TV tuners. I really do not care what happens to the cable box. You need to break the ground before it hits the first piece of equipment. A 1:1 transformer from a good vendor is the only reasonable way to do this. The cable company may be able to supply this and boost your signal accordingly. Then they are responsible for the quality of signal. It may cost you some money but is worth it.

The hum comes from multiple grounds. Circulating ground currents cause the hum. The earth is used as a return for your electrical power grid and gives rise to potential differentials between ground points. Complete with any waveform distortion. The cable is providing another path for these currents.

-Chris
  Reply With Quote
Old 23rd May 2005, 02:08 PM   #22
diyAudio Member
 
Join Date: Apr 2003
Location: New York
I'm currently thinking about using the Creative Labs
DDTS-100 decoder. That will allow me to use the
digital out. Then I can break the ground loop on
the digital audio cable (If necessary).

It will also allow me to use surround sound. I think
the audio DAC in the cable box do not sound very
good anyway.

Harry
  Reply With Quote
Old 23rd May 2005, 02:10 PM   #23
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Harry,
Now that is likely true. I would follow the ground breaker lead in any case. You have a valid reason to use the outboard DAC.

-Chris
  Reply With Quote
Old 24th May 2005, 02:43 AM   #24
Account Disabled
 
Join Date: Aug 2004
Location: Earth
I always use the safety ground because it's good to reference your system to - for safety! My kids are worth it. I do it through a 10 ohm resistor with eachway diodes in parallel. No ground loops.
  Reply With Quote
Old 24th May 2005, 03:44 PM   #25
diyAudio Member
 
Join Date: Apr 2003
Location: New York
I checked my second box. It has an optical digital out.
If I use that with the new decoder I've I will isolate my audio equipment from the cable box.

This way I do not have to float my amps. I'm building a new
set of amps (3-4 month time frame). I will consider putting the
diode protection in.

Harry
  Reply With Quote
Old 28th May 2005, 01:46 PM   #26
diyAudio Member
 
Join Date: Apr 2003
Location: New York
I got the processor. However the box that has the optical
out does not perform as well. It gives occasionally a
high frequncy pop when sh\witching channels. It also
forces my TV to switch input formats. This takes a while
(1-2sc) and is annoying when flipping channels). The digital
input is connected to ground and hums.

So I'm back to floating the power amps. Although they have
been working fine for 7 years I'm still not so happy as they
do have 750V power inside.

Harry
  Reply With Quote
Old 29th May 2005, 12:48 AM   #27
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Harry,
Float the cable ground!!!!

However you choose to do it.

-Chris
  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
Anyone using microphone cable in making their phono cable? rich121 Analog Line Level 8 10th September 2010 12:50 AM
cheap cat5e cable for speaker cable fishline Full Range 6 19th May 2009 07:42 PM
DAC-related reading anli Digital Source 0 26th February 2009 08:17 AM
New in package Component Video Cable and Toslink Cable for sale cheap jainbaby Swap Meet 1 30th December 2007 05:18 PM
problems with speaker cable as power cable pjpoes Parts 11 14th January 2007 08:24 PM


New To Site? Need Help?

All times are GMT. The time now is 05:18 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