From: Joerg Hansmann (jhansmann_at_g...)
Date: 2000-12-14 11:12:31
Hi Yaniv,
----- Original Message -----
From: <yaniv_vi_at_yahoo.com>
To: <buildcheapeeg_at_egroups.com>
Sent: Wednesday, December 13, 2000 5:07 AM
Subject: [buildcheapeeg] Re: late reply to jeorg letter
...
> > [smd soldering]
> > > i can't read pdf .
> > > tell me what type of package and i'll tell if it's complicated/
> >
> > Have a look a the package descriptions in the attachment
> > (hope your browser supports *.png )
>
> don't have it
sorry. I thought png were widespread but relative unknown.
Here are the pictures again, double sized and with compression artefacts
in jpg ;-)
...
> in the brainmaster site they explain how to build your own
> electrodes .
> aklso you can join the brainmaster email group
I subscribed to brain-m at Majordomo_at_s..., however
there seems to be no traffic.
"Welcome to the brain-m mailing list!
...
BRAIN-M INAUGURAL MESSAGE 12/1/95
...
"
And the greeting is from 1995.
...
> nepal or india
Can you tell me something about the climate zones you will be
visiting ?
Nepal = dry and cold ?
India = monsoon (100% humidity) ?
> > The temperature range and relative humidity range of the device
> > will be limited. But I think that it should work were a Laptop PC
> > works.
> just at least define - theoretical working temperature by checking
> datasheets ?
AT90S4433-8PC,28P3, Commercial (0°C to 70°C)
AT90S4433-8PI,28P3, Industrial (-40°C to 85°C)
6N139: Operating Temperature TA 0..70°C
TLC272CP 0°C to 70°
INA114AP, Specification -40..85°C
AD620A,B, TEMPERATURE RANGE For Specified Performance -40 to +85
The temperature range of the weakest part will be the limitation
for the whole device. Refering the ICs the temperature range
will be 0..70°C.
However I think the batteries will be the true limitation at low
temperature.
[humidity]
> maybe fan ?
A fan could help but draws more current than the rest of the device.
Heating would also help but is impossible with batteries.
Perhaps a hermetically sealed casing and chemical dehumidifyer
inside could be the solution.
However that means that all sockets and plugs must be industrial
or military grade - and that is expensive.
And what about your laptop PC ???
Is it working properly ? Or have you experienced problems ?
I think, it makes no sense to make the RS232EEG better than
the PC.
...
Regards
Joerg
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