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Author Topic: AC outlet ground loop hum  (Read 5822 times)

Mike Sokol

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Re: AC outlet ground loop hum
« Reply #10 on: February 15, 2014, 07:33:50 pm »

Sokol has several threads here that are relevant, you might want to take a closer look at this forum's index.

Here's a few past threads to get you started. Remember, there are dozens (perhaps hundreds) of reasons for hums, buzzes, and shocks, largely due to there being so many differently wired venues, rooms and instruments. Let me know if this helps.

http://forums.prosoundweb.com/index.php/topic,147212.0.html

http://forums.prosoundweb.com/index.php/topic,146138.0.html

http://forums.prosoundweb.com/index.php/topic,147000.0.html

and here's a few of my NoShockZone articles recently republished on ProSoundWeb.

http://www.prosoundweb.com/article//church_sound_stopping_hums_buzzes_and_shocks_on_stage_volts/

http://www.prosoundweb.com/article//stopping_hums_buzzes_and_shocks_on_stage_part_ii_meters/
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Mike Sokol
mike@noshockzone.org
www.NoShockZone.org

Nicholas Bailey

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Re: AC outlet ground loop hum
« Reply #11 on: February 15, 2014, 07:46:08 pm »

Mike,

I have really enjoyed reading your posts her and on your webpage.

Do you have any suggestions on a video projector ground loop.  I have a friends church that has a constant roll on the screen using the vga input?  You are the first person to suggest a amp clamp on a audio line I am going to have to get a clamp.

Thanks!

Nick B
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Mike Sokol

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  • Lead instructor for the No~Shock~Zone
    • No~Shock~Zone Electrical Safety
Re: AC outlet ground loop hum
« Reply #12 on: February 15, 2014, 08:46:33 pm »

Mike,

I have really enjoyed reading your posts her and on your webpage.

Do you have any suggestions on a video projector ground loop.  I have a friends church that has a constant roll on the screen using the vga input?  You are the first person to suggest a amp clamp on a audio line I am going to have to get a clamp.

Thanks!

Nick B

You're welcome. I once measured 5 amperes on a coax video cable with a clamp ammeter. Video Baluns (Bal/Unbal) are great for breaking video ground loop hum. Something like this maybe http://www.bhphotovideo.com/bnh/controller/home?O=&sku=713751&Q=&is=REG&A=details
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Mike Sokol
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www.NoShockZone.org

ProSoundWeb Community

Re: AC outlet ground loop hum
« Reply #12 on: February 15, 2014, 08:46:33 pm »


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