Opto-coupter and electric circuit of EEG-SMT

Started by Konstantin, February 19, 2013, 01:27:29 pm

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Konstantin

February 19, 2013, 01:27:29 pm Last Edit: February 19, 2013, 01:32:02 pm by Konstantin
Hello!

Can anyone explain me please? There written about opto-coupter: http://openeeg.sourceforge.net/doc/modeeg/modeeg_design.html
Where Is it on electric circuit of EEG-SMT?

Best regards.

LubOlimex

Hello Konstantin,

There is no such an opto-coupler in latest revisions of EEG-SMT. Instead of such we use ISO7221XD (U3) - dual digital isolator.

Best regards,
Lub/OLIMEX
Technical support and documentation manager at Olimex


Konstantin

February 20, 2013, 11:09:17 am #3 Last Edit: February 20, 2013, 11:33:33 am by Konstantin
Another question:

It is about EEG-SMT from here: https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/
CH1+ and CH1- are for the electrodes of one amplifier channel from here: http://openeeg.sourceforge.net/doc/modeeg/modeeg_design.html
("Simplified block diagram of the ModularEEG amplifier"). CH1+ and CH1- are for observing of the voltage difference between two points on the scalp.
Am I right?


LubOlimex

Yes. That is why it is good idea to place  both electrodes of one channel symmetrically across the skull.

Best regards,
Lub/OLIMEX
Technical support and documentation manager at Olimex