From: Yasanga G (syg1971_at_yahoo.com)
Date: 2002-01-29 11:57:43
Hi yaniv
When I compare your circuit it may be better than my because. my low passfilters are only about 43 Hz. to avoid 50/60Hz.
and no RLD. First I build the circuit , now I'm trying to fine tune it stepby step. Communication protocol is my own. There is nothing secret about the circuit.
What is electronic guru?
1. Input stage is isolated with 0.1uf caps
2. I'm not talented as most of you in the group. Only thing is I just buildit before perfect it.
For fiber optic isolation will be possible with small change. It is very simple later I will send you the circuit (I haven't draw it in the computer properly)
If those electrodes are good enough silver plated 2 electrodes and 2 ear clips could be about 6 to 10$.
Software is opensource. The format is my own format it support 4 channel and upto 15 bit resolution in 19200bps.
Still I'm in a process of fine tuning the circuit and software.
I'm from Sri Lanks Working in Singapore in IT field.
Do business over the net? I'm going to sell few machine any way and I haveanother group of people who is interested in this mind development in Singapore and Australia. yes why not.
Before do business I have to fine tune the circuit.
SYG
----- Original Message -----
From: yaniv_vi
To: buildcheapeeg_at_yahoogroups.com
Sent: Tuesday, January 29, 2002 3:10 PM
Subject: [buildcheapeeg] Re: EEG Project
hi man
nice , nice . sounds very interstin .
can you share specs , and maybe schematics ?
if you post your communication protocol , we could ask rob sacks to
make electric guru software work with your machine . interested ?
2 questions about safety :
1. tell us a bit about your input stage design .
2. would it be posible for a talented designer like you to make a
little change and instead opto coupler isolation ,
make fiber optic based isolation ? it's surely safer , and surely
more marketable as safer this way .
we have a design of this , it's very simple .
by probes you mean electrodes ? how cheap will they be , and what
type they are ?
about software , is it closed source ? or would you like to make it
open source , as a base for our software development , and then
people will probably help you write code .
by the way , which country are you from ?
would you like to be in the business of selling assembled and tested
devices throught net ?
sincerly
yaniv vilnai
--- In buildcheapeeg_at_yahoogroups.com, "S Goonesekera" <syg1971_at_yahoo.com> wrote:
> Hi All
>
> I have build an EEG machine similar to your design, with
microcontraller to communicate with the computer (PIC16F877 Upto 8
channels, only 2 channel use at the moment expandable to 4
channels) through serial port with an optical isolator (4N25 if I'm
not wrong 5000V isolation) . and at the moment I wrote software to
for the data collection and display only. filtering part will be
added soon.
>
> I'm designing this for one for the nurofeeback therapist. he wants
a cheap and safe machine for his clients. I'll be writing software
according to his specs. He want about 10 units first.
>
> Now I'm in a process of finishing PCB and fine tuning software and
circuits. As soon as I finalize the PCB I'll be making about 100 pcs
because it's cheaper to do a lot.
>
>
> I found a person who can make probes He will be sending samples
soon. if his probes quality is good enough I'll be using it. Its
very cheap.
>
> This machine will cost less then US$150. (With packing user guide
and every thing. Cheaper version may be less than US$100).
>
> If any one need a assembled one I may be able give few units for
cost.
>
> SY
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:37 BST