Re: [Openeeg-list] Isolation needed when working with laptop?

[Joerg H. <in...@jh...>]

Hi,

Endolith, 24.06.2008 16:58 :
> On Tue, Jun 17, 2008 at 7:24 AM, Joerg Hansmann <in...@jh... 
> <mailto:in...@jh...>> wrote:
> 
>     However you should make sure that the user can not accidently plug
>     some cables
>     into the laptop when connected to the EEG amplifier.
> 
> 
> "The user" would just be me.  :)
> 
> On Tue, Jun 17, 2008 at 7:32 AM, Paddy Duncan <pa...@pa... 
> <mailto:pa...@pa...>> wrote:
> 
>     How about the 500 - 700 Vac display backlight supply??
> 
> 
> Fluorescent tube ballasts limit current, too...

Yes. They limit the current to a few 100mA.
This is good for the fluorescent tube, but way too much for a human.


>  
> On Thu, Jun 19, 2008 at 5:51 AM, Joerg Hansmann <in...@jh... 
> <mailto:in...@jh...>> wrote:
> 
>     Very improbable risks can be tolerated to some degree.
> 
>     And this product is not for the public but for experimenting only:
> 
> 
> Yeah.  Just making sure I understand the dangers before experimenting on 
> myself.  I'm sure I'm in more danger at work when I stick my fingers 
> into things that are plugged into 120VAC.  :)

Putting your finger into a 120VAC (230V here in Germany) powered device
does not need to do do any harm if all other parts of your body (and the finger) 
are not in contact with any conductor tied to another potential (e.g. earth, GND)

The key for safety is avoiding closed current loops through the users body.

When there is no current flow, there is no damage.


Regards,

	Joerg