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Re: [TCML] A Safe Tesla Coil - was: Tesladownunder update, briefcase coil, lots of sparks etc



It used to be said that the ventricular fibrillation range is 30-100mA across the chest. Recovery from this requires defibrillation and does not usually occur spontaneously. More than that induces asystole which is when the heart completely clamps down but readily restarts. This is what we routinely do to correct certain rhythm problems using a defibrillator and is safe although the shock is synchronised to avoid the T wave which might induce VF. Typically 5kV is discharged via an inductor through the 50 - 100ohms of chest resistance and about 200 joules is typically transferred in a few ms. The newer bipoar defibrillators transfer less current.
So typically a normal NST is in a potentially lethal range.
The sparks from a big TC are not really in the range of mA, however the waveform is chaotic and have peak current potentially in 10's of amps on a microsecond basis. Even my small TC will give muscular contraction so it must be haveing a physiological effect. So the real safety answers? Primaries are potentialy lethal and secondaries may be.

Peter
www.tesladownunder.com


----- Original Message ----- From: "Frosty" <frosty90@xxxxxxxxx>

I agree entirely. All the bad info out there saying tesla coil outputs are
'safe' as the high freqencies cannot 'be felt', is terribly misleading. The energy availible in a signal tesla 'strike' is probably quite considerable,
certainly enough to do damage, even if you can't feel it immediately (from
my experience you can always feel it anyway).

Terry, as you are a doctor you could probably answer this question; what is the exact machanism by which electrocution causes death? Im aware there are
usually more than one reasons, but what are the most common? In terms of
disrupting the nerves in you heart/circulatory system, it would be
interesting to know if the higher rf freqeuncies can actually cause the same
effects as DC and lower audio frequencies. If not, maybe the output is
'safer' than its made out to be (bad wording, really should be 'not as much of a risk'). Aside from these effects there would be the usual burning etc,
which seem to be worse at radio frequencies, but still for a small coil
probably not life threatening.
..
Cheers,
Jesse

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