 | | How can I build sensor to measure eeg —Taweesak Opasvorarat
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| | | Hi, I just have a quick question. Hope you guys could give me some pointers. I'd like to build a sensor that measures the voltage of the brain wave like those EEG machines seen in the hospital. And would like the RCX to log the data. I have scanned (...) (23 years ago, 6-Aug-01, to lugnet.robotics)
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| | | | | Re: How can I build sensor to measure eeg —John Barnes
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| | | | | (...) First of all, you'd simplify things if you made your amplifier center around 2.5 volts rather than 0. Then your amplified signals would become 2.5 +/- 2.5 which the RCX will like. And if you run the amplifier from a stabilized 5 volt supply, (...) (23 years ago, 6-Aug-01, to lugnet.robotics)
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| | | | | Re: How can I build sensor to measure eeg —Juergen Stuber
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| | | | | (...) 5V/200uV=25000 (or maybe half it the 200uV go both ways). Should be no problem to obtain with multiple OpAmps. There was an article in the german computer magazine c't ((URL) that describes such a beast, but it's not on the web and I don't (...) (23 years ago, 6-Aug-01, to lugnet.robotics)
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| | | | | Re: How can I build sensor to measure eeg —Stef Mientki
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| | | | | (...) First, normal EEG is between 0.1 and 20 uV, with some exceptions uptil 100 uV. With a special (low noise, high CMRR) instrumentation opamp this would be no problem. Second, the highest frequency is about 120 Hz, so you need to sample at least (...) (23 years ago, 6-Aug-01, to lugnet.robotics)
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| | | | | Re: How can I build sensor to measure eeg —Scot Wilcoxon
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| | | | (...) Try searches for "instrumentation amplifier schematic". Everything must be battery-powered, as you have to break down the skin's electrical resistance with things such as KY jelly or salts-based electroconductive gel (very irritating to the (...) (23 years ago, 7-Aug-01, to lugnet.robotics)
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