Ground Loop Isolation - for cable TV ? - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 25th May 2007, 06:45 AM   #1
diyAudio Member
 
redrabbit's Avatar
 
Join Date: Oct 2004
Default Ground Loop Isolation - for cable TV ?

Yes, I had audio hum resulting from the coax cable's ground, and resolved it with an Iso-Max VRD-1FF -- inline to the cable box.
Hum is 95% gone.....that's acceptable for me.

HOW DO I MAKE something similar ?
Is it just inline caps ?

Why can't I find any DIY ideas for this ?.....(besides the common back-to-back 75/300 ohm antenna transformers.)

=FB=
  Reply With Quote
Old 25th May 2007, 04:16 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
the hum buster may be an audio transformer to provide isolation between the equipment.
__________________
regards Andrew T.
  Reply With Quote
Old 25th May 2007, 06:29 PM   #3
diyAudio Member
 
Juergen Knoop's Avatar
 
Join Date: Jan 2007
Blog Entries: 3
the so called antenna isolation transformers sold here rely on capacitor coupling.
No transformer inside the tranformers...
  Reply With Quote
Old 25th May 2007, 11:05 PM   #4
diyAudio Member
 
redrabbit's Avatar
 
Join Date: Oct 2004
I still don't understand why there isn't an easy diy solution ?
If they're caps, what values ?

Those Jensen isolators have a stated frequency that they filter/isolate, which I guess is crucial, so as not to degrade the video signal.
I believe they use caps too.

Many of us use ground isolation in our audio projects including me.
(10ohm resistor, and 100nf cap between earth and circuit)

=FB=
  Reply With Quote
Old 26th May 2007, 02:50 AM   #5
diyAudio Member
 
Juergen Knoop's Avatar
 
Join Date: Jan 2007
Blog Entries: 3
of course you can DIY. The absence of a dedicated internet site doesn't mean one can't do it.
Choose a 100pF or larger ceramic for the inner conductor and something in the nF range for the shield.
regards
  Reply With Quote
Old 26th May 2007, 02:54 AM   #6
diyAudio Member
 
Join Date: Mar 2006
Location: Michigan
Default Re: Ground Loop Isolation - for cable TV ?

Quote:
Originally posted by redrabbit


Why can't I find any DIY ideas for this ?.....(besides the common back-to-back 75/300 ohm antenna transformers.)

=FB=
Whats wrong with this solution, it is what I used in my dorm room, worked great!
  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
Good Example Balanced Input Circuit? (Ground Loop Isolation) MartyM Car Audio 44 25th August 2008 02:41 AM
DIY cable tv ground loop isolator. please help imperfectcircle Parts 0 31st January 2007 10:13 PM
USB DAC - ground isolation pho_boi Digital Source 8 26th July 2006 05:41 PM
hum,ground loop,earth loop problem with your answers please frank2395 Pass Labs 2 17th May 2005 07:46 PM
does connecting mains ground with circuit ground create a ground loop? jarthel Everything Else 0 25th June 2003 01:55 PM


New To Site? Need Help?

All times are GMT. The time now is 03:32 AM.


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