EEG Project XTRa

1.Evulation

1.a Connector

Amphenol

not cheap
Connector not closed when not used

Cinch 3.5

when not Connectet Input is closed.
not expensive
Plug not isolatet

w

2. Input Protection Circuits

i have made mesurement on Vinput(0 - 1V) and Iinput to find out which input protection is good
Openeeg Protection works in to ways. but wich way is used ? standard basis (at app 0.7V) input will collector emitter short circuit or the reverse Transistordiode will work?

Links

Connector

Input

OpAMP

AD Converter

preferred: LTC1867 - 12-/16-Bit, 8-Channel 200ksps ADCs

http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1155,C1001,C1158,P2497

http://www.analog.com/en/prod/0%2C2877%2CADuC7027%2C00.html

Microprocessor

http://www.olimex.com/dev/index.html

LPC-MT-2138
LPC-E2124

Casestudy

we can use 6 one-sided printed circuit boards where the holes are bored. thus the plugs can be soldered on the board. better hand sketch follow.

uP Software
http://www.crossstudio.co.uk/msp430/uip.htm
http://www.freertos.org/portrowleylpc2124.html

Evaluation Boards

http://www.olimex.com/

Pictures:

my openeeg front

my openeeg back

my openeeg opened

rubber electrodes

hamon kohdan plugs

Olimex ARM Proc. with Ehternet and usb

Linear 24bit 16 Channel test board and USB Adapter

Openeeg Test and Measurement Unit

Openeeg Standalone Version ? uP 60MHz LPC212x fft can solved with the uP

Calaudius Viviani
8610 Uster
Switzerland