Re: bluetooth eeg

I can answer a couple of questions.

The sample rate should be high enough so that people and pets don't hear it if your filter isn't strong.

AGC should be used, though it's also handy to have a throttle control.  AGC, at least in radio terms, quiets the loud and loudens the quiet.  Having a gain control lets you decide how loud a signal you want, while AGC will help to keep you from frying* a transistor with too much signal.

Kevin

*that's a technical term.
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On Wed, 11/5/14, wikitronic <[email protected]> wrote:

 Subject: [Openeeg-list] bluetooth eeg
 To: [email protected]
 Date: Wednesday, November 5, 2014, 2:52 PM
 
 Hi,
 I have been tinkering with some components to make an
 open source bluetooth eeg.First question I have is:
 
  Are there any examples of a bluetooth eeg already built
 that include everything I need to build from components?
 
 I have started playing with a design of my own. I want
 to use the dual channel fm frontend and connect it to a pic
 microcontroller and bluetooth serial module. My next
 questions have to do with the design of the device:
 
 What adc sample rate is sufficient for eeg
 signals?
 
 Would it be a good idea to use an automatic gain
 control circuit instead of a potentiometer?
 
 thank you.
 
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