quietmedic
New Member
Hey all. I'm looking for an isolation circuit for the device described on this page: The Story of My ECG.
Basically, it is a simple EKG (electrocardiograph) that interfaces with your computer sound card via standard 1/8" audio, and obtains your readings via 3 custom electrode leads placed on patient's chest.
As the author himself states, the unit is generally safe BUT in event of some catastrophic series of failures, there is nothing preventing your 120V AC from inadvertently transmitting down the electrode lead, potentially killing the patient. He suggests a linear optocoupler for isolation, but does not post one.
So: would anyone be kind enough to suggest a simple analog linear optocoupler circuit that can be used for this project? (I know basic electronics but am nowhere near good enough to design a real circuit based on the datasheets for typical stuff like the LOC110)...perhaps there are already circuits of this type on this forum or online...just don't know where to look or what would have the proper specs for this application.
Thanks in advance for any help..
Basically, it is a simple EKG (electrocardiograph) that interfaces with your computer sound card via standard 1/8" audio, and obtains your readings via 3 custom electrode leads placed on patient's chest.
As the author himself states, the unit is generally safe BUT in event of some catastrophic series of failures, there is nothing preventing your 120V AC from inadvertently transmitting down the electrode lead, potentially killing the patient. He suggests a linear optocoupler for isolation, but does not post one.
So: would anyone be kind enough to suggest a simple analog linear optocoupler circuit that can be used for this project? (I know basic electronics but am nowhere near good enough to design a real circuit based on the datasheets for typical stuff like the LOC110)...perhaps there are already circuits of this type on this forum or online...just don't know where to look or what would have the proper specs for this application.
Thanks in advance for any help..