Hulda Clark's Zapper - contra-indications
Appendix 1: Effect of current in the human body

In the document (PDF, in French) downloaded from 
Http://www.ac-nancy-metz.fr/enseign/physique/Securite/secu-elec/download.htm
Chapter I: “ Les dangers du courant électrique ”, We have an excellent description of the dangerous effects of
electric current on the human body.

In this document, we will retain:

= It is the amount of electricity which determines the effect of the electric current in the human body.
This amount depends on the current flowing and the time of exposure.
     Q (quantity) = I (current) x t (time)

= The current depends on the applied voltage AND the resistance of the load (here, living human body):
Ohm's Law : I (current) = U (voltage) / R (resistance)

= The electrical resistance of the human body varies widely depending on different parameters:
     = Tiredness, health, age of the person;
     = Humidity of the skin at points of contact;
     = Quality of the skin;
     = Contact area;
     = The voltage applied between the contact points.

The electrical resistance of the human body varies from a few hundred kohms in low DC voltage, to less than 200
ohms, in the case of electrocution by lightning.
Another document indicates a resistivity of the blood of 200 ohms.cm.

At the perception level, we will retain:
=  0.5 to 1mA : Threshold of perception depending on the condition of the skin
8 to 10mA: Shock at contact, backlash
=  10 to 20 mA: electric shock + contraction of the muscles.  Continuous nervous twitching.
=  Above 20mA : Deadly risk proportional to the current.

The human body responds to electrical current as a variable resistive load and variable capacitive load.
The inductive effect is almost non-existent in zapper use.

I recognize two effects to frequency in a zapper:

1_ The frequency (rhythmic voltage fluctuations) allows the current to bypass the skin resistance (very high) to
penetrate through the capacitive effect of the skin, which offers a much lower capacitive resistance, as frequency
increases.

This capacitive resistance (Impendance) follows the formula Z = 1/CF2pi.
With a capacity of approximately 0.01uF (order of magnitude with copper handholds) impedance to 2.5kHz
frequency will be 6366 ohms. At 30kHz, the same formula will give us approximately 530 ohms, or 12 times less.
The frequency will therefore determine the ease with which the current will penetrate through the skin.

Our personal tests (all impedances combined) with a DC voltage of 9V (no frequency)(2 copper handhold) reported
a resistance of about 25k on bare copper and 10kohm on the handles with wet and salty paper towels..

= With a frequency of 2.5kHz, the overall resistance decreases to about 1kohm.
= With a frequency of 30kHz, the overall resistance decreases to about 750ohms.

2_ The chosen square wave frequency can, by the creation of harmonics, hit the resonant frequency of one or
more parasites, eliminating these particular species,  even better.

Note: I’m not a “skin effect” believer (see appendix_3) and I don’t care about-it in the choice or design of Maestro-
Zapper frequencies
Appendix_2 : Internal zapper's impedance and safety

A zapper can be described as an offset frequency generator with a resistor in series.  This resistance limits current
to a safe level for the device (output short-circuit) and for the load (me!)

Without load (open circuit), the output voltage is approximately 0.5V lower than power supply on a 555 zapper,
meaning 9V with a fresh 9V battery. 
0.5 to 1mA is the threshold of perception.  8mA could give a shock at contact, more than 10mA is very unpleasant.
For a comfortable use of a zapper, we found 5 to 7mA to be a maximum.

The body’s resistance at 30kHz is about an average of 700 to 1000 ohms with copper handhold.
A 9VDC zapper will reach 5mA wit a total of 1800ohms (1000ohms from the zapper + 800ohms from load).

The choice of Ms. Clark of 1kohm for his original zapper seems a very good choice :
1000ohms(Zapper) + 700 to 1000ohms(me) = 4.5 to 5.0mA peak in short circuit conditions.

The choice of some manufacturers reducing their dynamic resistance to virtually 0 by adding a capacitor in
parallel with the internal resistance (exit "do not distort") (Bigger is better) seems questionable at best to us. 

It is always good advise,
with any electronic device
(including zappers), to
avoid its use if you are
wearing other vital
electronic instruments
(such pacemakers),
or if you are pregnant.
Zappers had been used on 8 month old babies and the elderly with no problems. They had been used safely
by tens-of-thousands of people all over the world with all kind of major and minor illnesses, for more than 10
years. You may feel worse at the beginning as parasites die off, but this is usually gone within ten days. The
Zapper isn't likely to hurt you, but everybody is different and some people react differently than others.
However, nothing is perfectly safe, so please, use common sense :
It’s up to you to judge what is happening in your own body.

This material is not a toy. The Zapper’s family have the good reputation of removing a lot of
parasites, and this, very quickly, not without some annoyance :

A part of this mass is either digested, or evacuated, creating sometimes a state of slight dizziness,
nausea, foul-smelling flatulence, headache, itching or stiffness at the joints, irritated skin, tiredness
and somnolence (as after a large meal) etc. (thanks, God, not all together or at the same time !)

After the first zapping session, immediate or delayed tiredness may occur for few minutes or hours.

This is probably due to the sudden release of toxins from dead parasites; the gas usually is from killed
intestinal worms.

This state will disappear and be replaced by a fresh feeling of lightness and awakening, as after a few days
of fast.  To help this elimination it is advised to drink 1 to 2 pints of water every day, water of good quality,
non-mineral and not gasified.

A lack of liquid during an important elimination can lead to an increase in your blood pressure and to various
irritations caused by a massive concentration of badly diluted “dead bodies” and their toxins.
In these circumstances, kidneys and liver work hard.
If you have these organs week or lazy, be vigilant.
An exaggeration in the use of Zapping can also lead to intestinal problems (beginning of diarrhea). Yogurt
capsules will help.
The work of elimination and the tiredness which accompanies it can be contraindicated, if you are already
weakened.

Another “problem” may occur:
The passage of a small current through your body seems to stimulate inter-cellular exchanges (cells
communicate better) and excite / awaken the "soldiers" of your body, which become suddenly hungry of
microbes.

Result _1: Your immune system works better and gets quickly rid of all the accumulation of unwanted
passengers, sometimes a little too fast.

Result _2: If you have any substances in transit in your body, like “legal drugs”, alcohol, illegal drugs, ...)
"accelerated intercellular trade", (up to 20 to 30 times faster) will make the distribution of these substances
MUCH more active. This phenomenon, falsely called electroporation, has been noted by many.

If you take any medications, using the zapper in the morning, before you swallow your daily dose of
medical dependency could (conditional) be more appropriate.

Monitor the effects of the zapper, and make the correct dosage of your medications with your doctor, if
necessary. You should be aware that this COULD happen (or maybe not) to you, everyone reacting in a
different way

If you try the zapper with disturbing substances transiting your body (legal or not), you could  be a
candidate for an ultimate experience of natural selection:
BE CAREFUL : THE ZAPPER IS NOT A TOY.
YOU ARE TESTING-IT ... ON YOUR LOVED OWN BODY!

The vast majority of you will be little or not affected or even bothered by these warnings.

But ... Just in case ... Be warned


Certain Internet sites associate zapper and serious illness.
It is not our role to make such assertions. 

Illness does not interest us.

We leave it to the experts of the unhealthy states.
We are only interested to feel better, which is highly subjective, and to get rid of as much “invaders” who drain our resources, as possible.

These invaders, who live at our expense, we name them under the generic name of “parasites”.

We experience the influence of the zapper effect
on these parasites, on a hypothetical and empirical basis, which have nothing to do with medical or scientific rules.
Legal disclaimer :
We do not prescribe, diagnose, or make any medical claim or advices.

The principles, assumptions or theories exposed here have no medical or scientific value officially recognized.
Please note that Dr Clark’s  books or devices have not been evaluated by Health Canada (Canada) or Food and Drugs Administration (USA), and then, have not received any guarantee on their effectiveness or their safety.
Zappers can only be sold or used as experimental devices for educational research.  They are not intended for use in the cure, treatment, prevention, diagnostic of any disease.

If illness is an issue, please consult a licensed health professional before attempting any self health program.

By using this information without the approval of a licensed health professional, you are prescribing for yourself, as permitted by law, and you take full responsibility for the results.
These results may vary depending on individuals
 
Zapperwise
Applied Electronic to Well-Being