--- In email@example.com
, "Joerg Hansmann" <jhansmann@g...>
> Hi Yaniv,
> ----- Original Message -----
> From: <yaniv_vi@y...>
> To: <firstname.lastname@example.org>
> 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
> > >
> > > 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
> in jpg ;-)
the package is not very hard to solder.
it's a simple package.
> > 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@s..., however
> there seems to be no traffic.
go to the history of the group
> "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
> > > 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.
basicly - all the stuff would be in a room - where we should meditate
so 0..70 is good enough .
> However I think the batteries will be the true limitation at low
what is a battery temperature range ?
i used a walkman here - even at relativly cold temperature i idn't
faced any problems .
> > 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.
i don't understand why ?
i think 0..70 is good enough . and the device should have way not to
don't worry to much abou batteries ,
we just have to check how much time the device works on batteries
with / witouht a fan .
but the device should be in a closed box (emi , rfi) ?
so maybe we just design it with a good heat conduction like solid
ground and stuff - and connect to the box through a some
electricly isolative - but heat conductor ?
> And what about your laptop PC ???
> Is it working properly ? Or have you experienced problems ?
i haven't bought it yet .
> I think, it makes no sense to make the RS232EEG better than
> the PC.