polygraph and cardiograph to A/D

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Tommy volts
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polygraph and cardiograph to A/D

Post by Tommy volts » Tue Dec 10, 2002 3:35 pm

I use the DRDAQ A/D converter with PC oscilloscope software to graph voltage traces etc on my PC. I would like to graph heartbeat and brain waves. Does anyone no a way to get brain waves and or heart beats into an electrical signal that I can plug into my DRDAQ? :confused:

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Chris Smith
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Re: polygraph and cardiograph to A/D

Post by Chris Smith » Tue Dec 10, 2002 4:03 pm

Long Coils of fine copper wire wound like a transformer over ferrite cores, and a clean op amp with gain of 100 or so should be able to read brain waves fairly well. <p>Heart beats can be physical, or electro mechanical, as well as the coil pick up method with lots of gain, to sense the weak electrical force involved in and around the area. <p>I am assuming your experimenting novice like?

Dimbulb
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Re: polygraph and cardiograph to A/D

Post by Dimbulb » Tue Dec 10, 2002 4:40 pm

http://openeeg.sourceforge.net/doc/modu ... d-tips.txt
<http://home.att.net/~jnozum/EKGHappy.htm> <p>
16 page pdf from TI has an ECG typical app
http://www-s.ti.com/sc/ds/ina331.pdf

one person used LC made of toroid 10 mH .001uF for EEG ??

Tommy volts
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Re: polygraph and cardiograph to A/D

Post by Tommy volts » Wed Dec 11, 2002 8:38 am

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Chris Smith:
Long Coils of fine copper wire wound like a transformer over ferrite cores, and a clean op amp with gain of 100 or so should be able to read brain waves fairly well. <p>Heart beats can be physical, or electro mechanical, as well as the coil pick up method with lots of gain, to sense the weak electrical force involved in and around the area. <p>I am assuming your experimenting novice like?<hr></blockquote>

Bernius1
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Re: polygraph and cardiograph to A/D

Post by Bernius1 » Wed Dec 11, 2002 10:21 am

I WOULD THINK THAT THE EKG IS VOLTAGE MEASURED
DIRECTLY THRU THE SKIN, FROM 2+ PLACES INTO A
DIFF-AMP.
CHRIS.. THANKS FOR THE NOTORIETY..
IT'S " ..EXPERIMENTING NO_VICE STYLE...", USUALLY
FOLLOWED BY A BUZZING, OR POPPING SOUND !!!! :D
Can't we end all posts with a comical quip?

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