noise when connected to power supply

lerky · Post by **lerky** » Fri Apr 08, 2005 7:49 pm

Anybody know a way around the noise you get when your lapop is plugged into it's power supply?
other than run on the battery...

lerky · Post by **lerky** » Fri Apr 08, 2005 9:04 pm

forget it guys i found the solution

cbit · Post by **cbit** » Sat Apr 09, 2005 5:05 pm

it might be handy if you told people what the solution was..

ive been looking at this problem recently and here are some useful keyowrds: ground loop isolator, rca converter, Di box (behringer ultra-DI DI20)

KU · Post by KU » Sat Apr 09, 2005 8:09 pm

I too have this horrible problem!

I have gotten a new replacement power supply, added a Monster 1200 3 stage power filter, even had the entire motherboard of the laptop replaced. Not to mention isolating every plug and piece of gear and testing at multiple locations!

I have noise free operation when running off batteries only. Perhaps I should invest in batteries...

nybbl · Post by **nybbl** » Sat Apr 09, 2005 11:57 pm

I had this too, and the simple 35cent solution (if you can get one) is a ground life adapter that converts from a 3 prong to a two prong.

Use at your own risk and all that.

I plug into a super surge protected monster cable power bar so I feel OK.

hope that helps.

lerky · Post by **lerky** » Sun Apr 10, 2005 9:53 pm

Disconnect the ground from an extension cord or powerboard,(unscrew plug, disconnect wire from prong) make sure you insulate the ground properly with electrical tape.
Plug in laptop to extension cord or powerboard
voila no noise
checked with my dad who is an electrician/telecommunications technician, he didn't seem overly concerned that his sons life would be at risk, or the computer for that matter as the stepdown transformer on the psu would isolate any surge or spike in the power supply.
Might be a good idea to get an extra surge protector plug just to be on the safe side though.
Worst thing that could happen is you may need to get a new psu if lightning hits.

KU · Post by KU » Tue Apr 12, 2005 10:42 pm

I am astounded
I am filled with relief
deepest gratitude

I have struggled with this noise for so long that I cannot properly appreciate the humour of this 35 cent solution to a problem that has caused me so much anxiety

I have consulted with many a laptop tech, I live in freakin Silicon Valley!

I didn't even have to go to the store... I had an adaptor in my drawer

nebulae · Post by **nebulae** » Fri Apr 15, 2005 9:40 pm

I also looked into a $0.35 solution, but got really concerned about being in a DJ booth with significant amounts of power all around me. So I looked into a safer solution:

Hum-X from Ebtech: http://www.ebtechaudio.com/new.html

You can get it online for about $49 - http://www.audiomidi.com/common/cfm/pro ... m?pid=4803

I've used it on my laptop for about a year, with no hum whatsoever in my audio. Without it, I'd get hum in my recorded audio as well as my outputs. I wouldn't run audio on a laptop without Hum-X.

Sorry to sound like a freakin' commercial endorsement

ralin · Post by **ralin** » Sun Apr 24, 2005 1:32 am

^^^

Thanks a ton, thats exactly the type of solution i was looking for. and for all you people using the 35 cent solution. i think that breaks the warrenty on your laptops fyi

nebulae · Post by **nebulae** » Sun Apr 24, 2005 2:46 am

If you get it from AudioMidi.com, tell them Neb sent you, so they know to owe me a favor

Perc · Post by **Perc** » Tue Apr 26, 2005 1:31 pm

Does anyone know of a UK/British version of the Hum-X for our plug type?

Big noise problems with my laptop at present

Thanks.

Perc · Post by **Perc** » Wed Apr 27, 2005 12:33 am

moving the laptop power supply away from the plug board has powers my ozone keyboard has just got rid of 75% of the hum!!!

happy days!

noise when connected to power supply

noise when connected to power supply

share the noise

a new way to say HoooOOooOOoooorrrraaaaayyyy

Hum-X from Ebtech will do the trick, SAFELY