Re: [Openeeg-list] CAN'T ELIMINATE 60Hz Hum!!!

[Oscar M. <oam...@ya...>]

What happens if you connect EEG gnd and PC gnd?

I thought PC gnd was tied to earth gnd.

thanks,

-Oscar

--- "Moritz v. Buttlar"
<in...@ba...> wrote:

> Am Montag, 31. Dezember 2007 00:00 schrieb Nitin
> Egbert:
> > Some thing that might be useful for future
> builders:
> > If replacing the DC to DC converter with two
> wires, don't use two wires.
> > Use an inductor with an appropriately large
> impedance to connect the two
> > V+'s and a wire to connect ground.
> > This also helped remove some of the mains hum
> 
> 
> Hi Nitin,
> 
> pleases don't replace any parts by anything !!! What
> you describe is VERY 
> DANGEROUS. The DC/DC converter is there to protect
> your brain by isolating 
> the eeg ground from the pc (and mains) ground. It
> also reduces mains hum.
> This device has been carefully designed but it works
> only properly if you 
> build it exactly like described.
> 
>  Moritz
> 
>
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