10 watt shock from iMac-halp?

[nix808]

Heya,
hmm- I'm getting low wattage shocks from my gear(a tickly kinda thing on soft contact), it's coming from->
Alienware monitor
imac
2 soundcards(stringport,presonus audiobox)
What do you make of it?

The 300 watt(I think) Alienware is fine to touch the installed power supply unit

I have a multi-meter, have not measured(a little unsure how)

Maybe I have a bad ground somewhere?
What should I do?

[nix808]

on the presonus audiobox 1818vsl-
the current is coming over the USB lead.
Is it just normal, do u think?

[mrcleats]

Not normal, no. Sorry, what do you touch that gives you the shock?

[mrcleats]

Current over a usb lead is absolutely normal, but getting a shock isn't.

[nix808]

it's the aluminium faceplate or steelwork cover,
it is truly the lightest tingle atm

[mrcleats]

Is it constant, or is it like a static discharge?

Sorry, just to be clear, it's coming from the aluminium faceplate of the presonus soundcard?

[nix808]

it's constant,
it doesn't discharge.
Yep, it's coming from the extruded alu faceplate or fabricated steel cover,
when USB is plugged in. the AudioBox is not plugged to it's power adaptor when this happens-
just to a USB lead. I can try plugging it into the power socket

What I did was unconnect everything and make sure I have all grounds in place,
the Audiobox has no ground. It's 18v DC adapted with the original adaptor

[JerGoertz]

Is there a fork sticking out of the power socket?

[nix808]

I had a snooze for a couple of hours-
and the Presonus doesn't make my hand tingle any more.
The iMac still does though.
I guess I won't worry about it.

Jer Goertz, we did possibly have a short in the house when our fridge stopped working recently.
That socket is now broken

[nix808]

oh u mean this one JerGoertz…
!
heh

[robotmonkey]

It's normal. This is what gives your tracks analog warmth.