Laptop earth-buzz audio fix

[lecnoob]

Ok - long story short. I do music shows and have power trouble using laptops for audio - earth buzz issues. My usual fix has been to find a replacement power supply designed with no earth pin on the plug - no more buzz. This has worked for the last few Toshiba laptops I had and is way cheaper than messing around with earth-loop killers or whatever.

So, my new Samsung has the usual problem, but now I can't find a 2-pin replacement power supply. I've been warned off just disconnecting the earth on the OEM power supply as apparently it might need it by design - though I have no idea why it should do when a 2-pin power supply works totally fine. Please correct me if I can just do this!

In desperation then I'm considering just swapping the tip over on my old Toshiba replacement 2-pin supply and using it with the Samsung - it's 19V and has enough amps. Is this a dumb idea? If not, can anyone tell me where I can buy a solder-able DC tip?

Many thanks!

(Tried posting this here first but doesn't seem like anyone there knows)​

 

[Davisonp]

Thought all laptop power supplies were 'regulated'? Or is there some special place to get em?

No, Try Maplins or "cpc.farnell.com" but make sure it says regulated output. If it does not mention regulated output, then it probably isn't regulated.

 

[lecnoob]

Only thing with a Samsung connector on cpc:
TRUST|17470|NOTEBOOK ADAPTER, 90W PLUG & GO | CPC
Trust.com - Plug&Go XS 90W Notebook Power Adapter - but £40! Seems a bit steep when my last one cost £20.

Can't see 'regulated' mentioned anywhere, or see if it's 'figure of 8' 2-pole plug or an earthed 3-pole kettle-lead style.

 

[CrazyScozzese]

CPC sell a hum stopper of about £15, maybe a cheaper option!

 

[lecnoob]

Yeah, I just wanna fix it at the source as I have 6 outputs from my soundcard that I may want to use - connecting directly to guitar amps, bass cabs etc.