[EEG] Fwd: electrodes

Kelly hurtstotouchfire at gmail.com
Tue Dec 22 12:07:59 PST 2009


>Seems like a waste of plugs. Hard pressed to imagine why you want more
than 1 plug/channel?

One for each electrode I guess?  Those plugs only support one?  Or can we
pipe a few through each?

I think that what we're going to do here is wire for the highest common
denominator.  The passive electrode setup could be simpler, but I think we
should be able to run it with the more complex board too, right?

I'm cc-ing John, who I don't think is on the mailing list yet.  Peer
pressure guys, come on...

-K

On Mon, Dec 21, 2009 at 10:45 PM, Josh Bailey <josh at anarkiwi.com> wrote:

>
> OK. That makes more sense. :)
>
> Seems like a waste of plugs. Hard pressed to imagine why you want more
> than 1 plug/channel?
>
> I should take a look at the thing next time. Sorry I was too busy
> congratulating myself over my hardware working and not helping. :( :/
>
> On Mon, 21 Dec 2009, Tracy Jacobs wrote:
>
> > Sorry, I said Pedro's is 4 channels but it's only 2 channels!  Four
> > electrodes, two channels, nine XRL plugs including the DRL.
> >
> > Begin forwarded message:
> >
> > > From: Tracy Jacobs <kinetical at comcast.net>
> > > Date: December 21, 2009 10:06:56 PM PST
> > > To: eeg at lists.noisebridge.net
> > > Subject: Re: [EEG] electrodes
> > >
> > > Well, when you look at Pedro's whole setup for 4 channels, he is using
> > > 8 xlr plugs plus one drl.
> > >
> > > The way Mitch wired up these two electrodes I have makes it seem like
> > > I can't wire them up to one xlr plug, but would need 2 for each
> > > electrode, because each electrode has 2 cables with wires going to
> > > different things.
> > >
> > > The passive elctrode diagram is much simpler, it looks like 2
> > > electrodes/one channel going to  one xlr plug with one cable per
> > > electrode?
> > >
> > > The wiring looks really  different to me...
> > >
> > > Tracy
> > > On Dec 21, 2009, at 9:55 PM, Josh Bailey wrote:
> > >
> > > >
> > > > Bit confused. The major difference between active/passive wiring is
> > > > with
> > > > active you of course have to ship the power up to the 'trode. I
> > > > don't see
> > > > any other major difference (i.e. I don't expect to see one)? What am
> I
> > > > missing?
> > > >
> > > > On Mon, 21 Dec 2009, Tracy Jacobs wrote:
> > > >
> > > > > Hello group,
> > > > >
> > > > > I was studying the instructions on the open EEG site for the case
> and
> > > > > cabling again, and it looks like you hook up the cables a bit
> > > > > differently for the active elctrodes that I made :
> > > > >
> > > > > http://www.dcc.uchile.cl/~peortega/ae/<http://www.dcc.uchile.cl/%7Epeortega/ae/>
> > > > >
> > > > >
> > > > >
> > > > > than you might want to do for the cap or for passive electrodes.
> > > > >
> > > > > http://openeeg.sourceforge.net/doc/SimpleEEG/CaseCabling.html
> > > > >
> > > > > So, I'm not a little unsure  how to proceed with the wiring.
> > > > >
> > > > > I made 4 of the PEdro's active electrodes, boards and all, and it
> > > > > would be lovely to get them to work. But that's still only two
> > > > > channels,
> > > > >
> > > > > Mitch said to use his boards with mine for the 4 channel.  There is
> > > > > enough room for 8 channels in this box, at least, if we can find
> the
> > > > > boards.
> > > > >
> > > > >
> > > > > Tracy
> > > > > _______________________________________________
> > > > > EEG mailing list
> > > > > EEG at lists.noisebridge.net
> > > > > https://www.noisebridge.net/mailman/listinfo/eeg
> > > > >
> > > > >
> > > >
> > > > --
> > > > Josh Bailey (josh at anarkiwi.com)
> > >
> > > _______________________________________________
> > > EEG mailing list
> > > EEG at lists.noisebridge.net
> > > https://www.noisebridge.net/mailman/listinfo/eeg
> >
>
> --
> Josh Bailey (josh at anarkiwi.com)
> _______________________________________________
> EEG mailing list
> EEG at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/eeg
>
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