> > In a paper found on the web from MIT Health Sciences and Technology, it was
> > stated that the electrocardiogram signal is approx 1 mv in amplitude. If
> > the signal is amplified, how can the 60 Hz be filtered by the PIC without
> > affecting the ECG signal?
> >
> > Howard
> > Howard McGinnis
Hi Howard
ECG power... MUST be isolated !!! (1,DC to DC converter 2, Optical
eg. convert amplified signal to drive HP optical isolators) Analogue filters
works fine.
Three pickups, one ground, placed across chest. Skin streach between
two pickups monitors breathing. (resistance)
Cautions: a few micro-amp can deflibilate the heart. Chemical burns
can occur under pad because of conductive gell. Hi frequency signal
(diathermy) or radio can turn ecg cables and pads into antena and
complete its path though skin.(bad burn)
Depending what you want to do, there are ecg interfaces (preamps)
available, You supply power and get signal. (insolated, CE app. safe
and $$$. If you want to do interface part....research and goooood
luck.
Regards
Cassie