Mr Bob Beck`s Plant Growth Stimulator
You will find the schematic of this "Plant Growth Stimulator" and Colloidal Silver Maker in this site, devoted to the
work of Mr Bob Beck : 
http://www.sharinghealth.com/
The output of this circuit will give you about 4Hz (7.83/2) at around 48Vptp with an alternative square wave.
This is not a "Hulda Clark Zapper" because output gives negative voltage as well (Alternative voltage)

To my acknowledge and experience, results are effective and similar to a standard zapper.

Please, note to the right, the colloidal silver generator.
A very simple, yet effective way to make colloidal silver.

You will find too on Internet interesting readings about this outstanding person and its 4 step "Beck Protocol".


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