Info/help/cct diagrams on ECG machines

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Information on ECG machines and their operation is sought for creating a simple wireless ECG device using Bluetooth or RF technology. Resources like HowStuffWorks do not provide direct explanations but offer links to related sites, such as TheMDsite, which focuses on EKG interpretation rather than machine mechanics. A search for "EKG machine electrode circuit" yields valuable results, including a paper titled "A Portable, Low-Power, Wireless Two-Lead EKG System" from Harvard. These resources can assist in understanding the circuitry and functionality of ECG machines. Additional research may be necessary to gather comprehensive information on the subject.
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I'm looking for info/help/cct diagrams on ECG machines, how they work etc etc. the full works. Looking to make a "simple" wireless ecg on bluetooth/rf.
any help? sites? thanks:)
 
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I went to Howstuffworks.com and did a search. They don't have a direct explanation about how EKG machines work, but they did have a link to this interesting site:

http://themdsite.com/default.cfm

That site is more about interpreting the EKG trace, not about how the machine measures it.

Then I googled ekg machine electrode circuit and got lots of good hits. Here's the first one:

http://www.eecs.harvard.edu/~mdw/papers/ekg-embs04.pdf

"A Portable, Low-Power, Wireless Two-Lead EKG System"

Hope that helps. -Mike-
 
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