Welcome, Guest

Author Topic: Opto-coupter and electric circuit of EEG-SMT  (Read 3858 times)

Konstantin

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
Opto-coupter and electric circuit of EEG-SMT
« on: February 19, 2013, 01:27:29 PM »
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.
« Last Edit: February 19, 2013, 01:32:02 PM by Konstantin »

LubOlimex

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1939
  • Karma: +50/-3
Re: Opto-coupter and electric circuit of EEG-SMT
« Reply #1 on: February 19, 2013, 01:56:19 PM »
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

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
Re: Opto-coupter and electric circuit of EEG-SMT
« Reply #2 on: February 19, 2013, 05:02:58 PM »
Thank you for the answer!

Konstantin

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
Re: Opto-coupter and electric circuit of EEG-SMT
« Reply #3 on: February 20, 2013, 11:09:17 AM »
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?

« Last Edit: February 20, 2013, 11:33:33 AM by Konstantin »

LubOlimex

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1939
  • Karma: +50/-3
Re: Opto-coupter and electric circuit of EEG-SMT
« Reply #4 on: February 21, 2013, 01:06:51 PM »
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

Konstantin

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
Re: Opto-coupter and electric circuit of EEG-SMT
« Reply #5 on: February 26, 2013, 03:41:18 PM »
Great! Thank you!