yet another laptop noise problem - hdmi |
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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Posted: 04 February 2019 at 12:56pm |
mutter mutter shite switchmode psu noise crap mutter mutter
my problem is that my laptop is dumping its unwanted noises into my hifi its the usual problem, fine on battery. fizzes, pops, hums and buzzes with the psu connected - present with all psus tried - disappears if I do the naughty thing with the earth disconnected (put your swords away gentlemen, it was done for test purposes only) isolation transformers would be lovely but: my problem is that Im connecting via hdmi has anyone come across a hdmi isolation solution? or I may just build a proper heavy metal psu and see if that improves matters
Edited by godathunder - 04 February 2019 at 12:58pm |
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LOUDER THAN LOUD
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Your laptop is double insulated anyways and doesn’t need an earth. If nobody else is gonna use it then remove away.
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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point taken but it feels like the wrong solution
Im obviously looking for a way of further complicating my life
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LOUDER THAN LOUD
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7442 |
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i'm sure that answers your question.
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dylan-penguinmedia
Old Croc Joined: 14 April 2011 Location: Brighton Status: Offline Points: 4575 |
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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thank you efinque, thats very kind of you but possibly not entirely pertinent to my problem
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LOUDER THAN LOUD
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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audio + video output required hence hdmi
Ive got a couple of those cheap little behringer usb interfaces for 2ch audio needs
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LOUDER THAN LOUD
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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If the laptop adapter has an earth then it's there for a reason, it's using it to provide the barrier between mains and low voltage output. So don't remove it. A class 1 psu is also allowed to leak alot more current to earth than a class 2 psu and with the earth lifted that leakage is going to present itself on any exposed conductor on or connected to the laptop.
I would look around to see if there's a double insulated power supply option (these used enhanced pri-sec insulation), the sort that uses a figure-8 mains lead. It's no guarantee of being noise free but it's got to be worth a try, I know clients that have had success with it in karaoke with multiple TVs. I'm sure you can get an HDMI isolator but I bet they're dear. |
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Kevin
North Staffordshire |
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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I think a rummage round the spares boxes is in order. Ill see if I can knock up a suitable 19v/70w wirewound psu out of the parts Ive got lying round and some minimal ordering.
will be interesting to see if it provides a solution Ill add it to the to do list and report back with results at some distant point
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LOUDER THAN LOUD
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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that's going to be a hell of a linear power supply! It'll need to use a switching regulator to get that sort of current without a heatsink the size of a potato waffle
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Kevin
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outkast
Registered User Joined: 23 September 2010 Status: Offline Points: 66 |
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May or may not be relevant, but I had a noise problem with an Apple Macbook 2012 which had a slightly different power supply to my older 2006 Macbook. The noise went away when I used the older power supply on the newer laptop, so the issue was definitely with the power supply.
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1293 |
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Fully sorted
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