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
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