Re: [Openeeg-list] Help! ModularEEG & Pascal/Delphi? Anyone?

[Martin S. <mar...@gm...>]

Hi Folks
Danke Joerg fuer die schnelle Antwort!

> http://www.velleman.be/ot/en/product/view/?id=351346
>
> Is K8055 the same as the P8055?
>
> If yes, you have a big problem: This thing has no data path / IO isolation.
> If you connect to it via electrodes you can easily kill yourself or at least get
> electrocuted.
> (See thread about Wild Divine)
>
Yes it's the K8055. But I think I will take the risk that a lightning
hits my BATTERY powered device. :-)
Joke aside, of course there are people who would consider it funny if
I would electrocute my professor but I personally take safety issues
rather seriously.
The setup will have no connection to any 220V line. The device is
powered by USB from a battery powered laptop and by a 9V block
battery.
Although it definitely will be connected via electrodes, this should
be safe, right?

> > a) Add modularEEG Analog Board to the second 8-bit channel of my
> > board. Is this possible?
>
> Yes, if done right.
I just printed this wonderful circuit of yours (Analog Board...). Fits
my wall perfectly.
So if I look at the Pinheads of the analog board:
I have an Olimex, which is prewired on pins SJ201 and SJ204 for
channels 1 and 2 respectively.
So one cable comes from pin 4 (10) into my analog input. Which pin is
ground (for Analog Input) [(5,7,9,11,13(AGND)) or VGND?] and how does
the power supply work [1&?]? If thats too far away from 'the truth' to
be answered in three sentences, maybe you can point me in the right
direction?


> > PS: I don't know if my GSR-measurement setup will work at all, has
> > anyone experiences with this?
>
> Yes.
> Try the free LTSPICE to simulate your circuit.
>
Thanks for this great tip, it looks like just the software I was
looking for. I installed it and tried to 'run' my circuit. Didn't work
out, I suppose my knowledge is simply too limited. I didn't even find
a trimpot-component (if there is something like that...).
Anyone interested can find my circuit here:
http://www.wondering-scientists.net/wp-content/uploads/2008/01/draft1.gif
(the circuit on the lower right is a photograph from the book, the big
schema is the LTSPICE draft. Couldn't upload the draft itself, FTP
only installed on the other comp... )


Again, thank you for your fast answer, I really appreciate the time
and effort you and all here put into this.
Have a nice evening
Martin S.