ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
75 kva tranformer
by sparkync. 09/23/17 06:41 PM
Another generator question
by gfretwell. 09/23/17 04:15 PM
What do you do?
by gfretwell. 09/22/17 10:37 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,905 Are you busy
176,675 Re: Forum
168,562 Need opinion
Who's Online Now
0 registered members (), 28 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#204646 - 12/26/11 05:34 PM Switching adapter for laptop interfering with mic  
Labarr15  Offline
New Member
Joined: Dec 2011
Posts: 7
NY
Hello ECN!!!

I am trying to fix an issue with my computer/headset. I just got an analog headset for Christmas and whenever I use the mic people say I have a buzzing noise along with my voice.(And when i test it with loopback i hear it too). However, whenever i disconnect my AC adapter, the buzzing stops and i sound clear.
I believe this has something to do with the conversion from AC to DC in my adapter? Am I correct?
If I am, is there something i can do to stop the buzzing noise? or is there other power adapters out there that doesn't do this?

Thanks!!!


Tools for Electricians:

#204647 - 12/26/11 09:26 PM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Hello Labarr15, and welcome to ECN!

The description you give appears to be 60 Hz Hum, coupled to the Audio.

You could insert Filters at the Power Supply for Noise Rejection, but the easiest (and less expensive) method would be to purchase a "Cleaner" Power Supply.

There are several Members who will have much better suggestions than mine, so feel free to hang around!

-- Scott


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#204648 - 12/27/11 12:08 AM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Labarr15  Offline
New Member
Joined: Dec 2011
Posts: 7
NY
Thanks for the input!!

I will be looking into a new AC adapter, one that is "cleaner", but I dont know what I have to look for...
Any input?
Thanks!!


#204649 - 12/27/11 01:21 AM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,222
SI,New Zealand
That power supply you have for your laptop is faulty.
There should be no AC ripple at all at the terminals where it connects to the laptop.
This alone, will affect the way your battery is being charged.
Batteries require VERY smooth DC with a minimal amount of AC ripple.
My advice would be to send it back under warranty, as it is not doing it's basic function.


Let's face it, these days if you're not young, you're old - Red Green grin

#204650 - 12/27/11 01:36 AM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Labarr15  Offline
New Member
Joined: Dec 2011
Posts: 7
NY
of course, my warranty ran out in November frown


#204653 - 12/27/11 03:43 PM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
EV607797  Offline
Member
Joined: Oct 2006
Posts: 745
Fredericksburg, VA, USA
I had a similar situation occur when using USB devices that have their own power supply. In my case, it was a USB hub that was causing the problem. The hub was capable of being powered by the host computer's USB port OR with the included power supply but not both. When I did away with the hub's power supply connection, all audio devices were crystal clear. The computer's USB port was able to provide sufficient power to run the hub.


---Ed---

"But the guy at Home Depot said it would work."

#204658 - 12/28/11 12:04 AM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Labarr15  Offline
New Member
Joined: Dec 2011
Posts: 7
NY
Thanks everyone for your input,

I just ordered a new AC adapter, which has 3 prongs and has a ferrite filter on it.. Hopefully it works, and ill let you know when i get it.

Thanks!


#204662 - 12/28/11 03:18 PM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,117
Estero,Fl,usa
I have a lot of stuff hooked up to my audio bus here (goes to several output devices) and I ended up needing a decoupling transformer on some of the things to prevent AC hum. The worst offender is the PC itself.


Greg Fretwell

#204708 - 12/31/11 06:38 PM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
Labarr15  Offline
New Member
Joined: Dec 2011
Posts: 7
NY
Hi again, the new ac adapter didn't fix it frown

But i was thinking, I use to use a USB headset, that worked great...

If I buy a external sound card (connected by usb), Do you think that might fix the issue? Cuz after doing alot more searching around.. I come to the fact that the internal sound card is crap :P

Thanks for everything!!!


#204710 - 12/31/11 10:38 PM Re: Switching adapter for laptop interfering with mic [Re: Labarr15]  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
Just wondering, have you tried using the AC adapter in a different outlet? Maybe one that is on the power conditioned output side of a UPS unit?



Page 1 of 2 1 2

Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.026s Queries: 16 (0.005s) Memory: 0.8190 MB (Peak: 0.9984 MB) Zlib enabled. Server Time: 2017-09-24 12:21:29 UTC