From: yaniv_vi_at_yahoo.com
Date: 2000-11-30 08:13:27
--- In buildcheapeeg_at_egroups.com, "Joerg Hansmann" <jhansmann_at_g...>
wrote:
> Hi yaniv,
>
> ----- Original Message -----
> From: <yaniv_vi_at_yahoo.com>
> To: <buildcheapeeg_at_egroups.com>
> Sent: Tuesday, November 28, 2000 10:52 AM
> Subject: [buildcheapeeg] hi folks
>
>
> > great job people ,
> > you ar awesome !!!
>
> :-) thanks.
>
> > got a machine working and
> > first software version in such a short time - it's cool .
> >
> > about lawyers and stuff - i think you could find a person on the
> > net via allexperts.com or similar site that would give us some
> > advice .
> >
> > but my opnion is :
> > 1. if we build the device safetly (e.g. infrared interface
>
> Recently I have seen a schematic for RS232<->irda conversion.
> The problem is that you will not get irda by simply connecting
> a (modulated) IR-Transmitter to TxD and an IR-receiver to RxD,
> because irda has shorter pulse lengths compared to RS232 at the
> same baud rate. What is needed, is an IC that performs stretching
> and compression of the pulses. Doing this in pure software on the
> AT90S4433 could be possible but very tricky and could not make
> use of the built in UART-hardware.
if you want to make it simple - it doesn't have to be true irda .
the first version of the desing could be consisted of 2 boxes :
one is the eeg with simplest infrared comm , and the other is just
little thing that connects to parallel port/serial port , with infra
red com .
i don't think that would higher the price much.
and the design is basicly already there (on the net).
just for the 1st version i think it'll be good.
after the first version if all we'll be o.k. then i'll think we could
work on better version easier - because we'll probably have more
people .
but maybe full irda is better , i don't know ?
>
> > ) and
> > with right box ( plastik with metal foil) we'll be safe enough
>
> The FDA probably wont think so before they have approved the device.
>
there's a eeg device called waverider - sells for $950 without fda
approval - and it's presented in futurehealth site - a very
respectable site for this things .
and another thing - i agree we should check it with some b.f.
practicioner maybe - or somebody that will check .
maybe somebody should check what it takes to run throught an
fda - and how much it'll cost for a gruop of volunteers ,
and if it's possible to be done by a group of volunteers ?
but i don't really think fda approval is a must .
i just thjink we should really check it with someone experienced
before getting it to market - maybe some b.f. practicioner would
volunteer -if we'l find one .
> > 2. i think an assembled kit manufacturer have much experience in
> > allot of this issues , and it'll maybe also be wise at this
> > to start a connecting with such , to get some feedback ,
> > and some connection .
> > i think somewhere in the list there's a name of such a person .
> >
> > 3. about the patents : jeorg - you don't have the schematics of
> > the brainmaster so how could you have stolen something from
it ?
>
> A patent would also be viloated, if I invented the same item
protected by
> the patent by pure chance.
> BTW: Meanwhile I have found the schematics of the brainmaster on
the net.
> The overall priciple is identical to the RS232EEG (Instrumentation
amplifier,
> 2nd amplifier stage, AD-conversion with microcontroller,
bidirectional
> opto-isolated RS232, AGND-generation, Feedback software on PC), but
in
> detail there are differences (e.g. way of DC-suppression, processor
type,
> communication protocol and speed, power-supply , etc.)
>
> > if you suspect some part of you design wil be specificly
liable
> > to patent suit - please tell me .
>
> The overall principle is the same.
there have been numerous designes basicly the same .
i don't really think there's a problem ,but i guess it's better to
check , and as i seen in our group we may have contacts to a lawyer -
so it'll be o.k.
>
> > 4. i know that in circuit cellar they have sold a kit of eeg for
$300
> > but not an assembled on so you still need electronics
knowldge .
> > our point is getting a complete device - so maybe we can
> > sell the electronic assemlbed board diffrently and the
enclosure
> > diffently - so it would be a kit .
>
> The lawyer in the brainwaves-egroup has told me months ago, that
> even an assembled pcb without casing would be critical.
>
> > and we could take off any liability .
> > and let's just keep to points again with this idea :
> > very simple assembly & very very safe design !
> >
> ...
> > and jeorg for info about noise in eeg machines - loook at
> > www.futurehealth.com there they also have some sp[ecs of some
> > machgines in the market .
> > and the noise in the b.m. is nasicly the noise in the input amp
ad620E
> > so check it .
> ...
>
> I have done some noise measurements on the RS232EEG with Rob's
> program and got about 1uVpp noise (RTI) with the old design.
> That is better or equal to the BM.
> If the new design works, it will have even less noise.
>
> Regards,
>
> Joerg
a little question joerg :
assuming i want to be the first beta tester - let's say even of the
version without irda - just a good version for portable pc (no need
of isolation)
would like to build one board and send it to me - i'll pay the
costs ? how much are the costs ?when it'll be ready stable enough
version of the h.w. - tested and tested in really measuring
brainwaves ?
the software i can always download from the net , so no problem .
basicly my problem that my friend in israel that was supoosed to
build brainmaster and send it to me - hasn't got the time - and also
not very serious about it , so basicly i think he won't build it .
i'm intend to find a buddhist lama here that would like to work with
me using eeg and other buddhist techniques , so it may be also good
for the public realtions of the project ?
best regards yaniv .
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:28 BST