[Amps] De fibrillators

[G3rzp at aol.com]

De fibrillators built into pacemakers dump about 40 joules at up to  1200 
volts into the heart from a capacitor. Protecting the pacemaker itself from  that 
is quite a problem, requiring special ICs. Normal pacing is about 12 volts,  
and defibrillator batteries are about 1 to 2 amp hours, but high internal  
impedance. Usual expected life is around 10 years.
 
Pacemakers are interesting devcies, from an electronics viewpoint. Even  more 
so when you build radios into them, as I happen to know from a  professional 
viewpoint......
 
73
 
Peter G3RZP