Info. about using soundcard.
- Hi Gang,
I just received this e-mail from Dr. Steven Harris at Cirrus Logic
to my question about using soundcard for EEG.
Use a small Analog to Digital converter module which you can
plug into the printer port on a PC, which comes with some analysis
I think PICO technology make one, see Electronics World magazine for
Increase the value of the DC blocking capacitors in the input
circuitry in the
sound card. Usually the codec chip and drivers pass dc-20kHz, it is
dc blocking capacitors that determine the 20Hz Hi Pass corner
Making these capacitors larger will lower the corner frequency.
You still need to block DC, so the capacitors are necessary.
You will a high gain preamplifier to amplify the brain signals.
Also, think a lot about safety. Professional EEG units are
very carefully designed so there is no possibility of electrocution.
PC's are not designed to the degree of safety required by medical
Dr. Steven Harris, Director || Cirrus Logic Inc.
Email: snh@... || Anglers Court
Tel Direct: +44 (0)7710 657828 || Spittal Street
Fax: +44 (0)870 0520252 || Marlow SL7 1DB
http://www.crystal.com || England
"Also, think a lot about safety. Professional EEG units arevery carefully designed so there is no possibility ofelectrocution."Yeah, we might want to avoid that possibility <g>Seriously, anybody have any thoughts on how possible this is?
- --- In buildcheapeeg@y..., "lucas darten" <ljdarten@h...> wrote:
>That's definately a part of the hardware design process.
> "Also, think a lot about safety. Professional EEG units are
> very carefully designed so there is no possibility of
> Yeah, we might want to avoid that possibility <g>
> Seriously, anybody have any thoughts on how possible this is?