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This page tells you how to make a Hulda Clark-style "Parasite Zapper". This is a simpler and more efficient version that works just like the original, but the battery lasts much longer. We make no therapeutic claims for this device. It is for experimental purposes only. We also provide a ready made version for those not so inclined or who simply prefer not to spend so much time building their own.

Parts and Materials

- A CD4069 hex inverter (Futurlec link)
- 1 1M resistor, 1 220k resistor, and 1 1k resistor (Radio Shack link)
- 1 100pf capacitor (Radio Shack link)

The Zapper is a very low power device so 1/4 watt resistors and 25 volt capacitors will be plenty sufficient, but feel free to use whatever you find handy.

NOTE: The exact values of most components may be substituted according to what you have on hand. The 220k resistor and the 100pf capacitor determine the frequency of the Zapper, which may be allowed to vary pretty widely according to Dr. Clark. The 1M should be kept relatively large compared to the 220K to provide a reasonably symmetric waveform. The 1k should be kept within 10 or 20 percent of value to provide reasonable current limiting. (If you know what you are doing and want to try different output currents, you can adjust this accordingly.)

The following parts may be substituted according to your preference, though something of the kind will be needed:
- Solderless breadboard (Radio Shack link)
- 9-volt battery
- 4 alligator clip-lead sets Radio Shack link
- 2 pieces of copper pipe (hand-holds)

* Sorry, Radio Shack appears to have changed their linking structure and their links don't seem to be working correctly. If you search around their site a bit you should be able to locate the necessary components. I'll try to post some alternate links when I get a chance.

Instructions

Plug the components into the solderless breadboard according to the schematic. Make sure none of the wires touch each other. Connect pin 14 of the chip to the positive terminal on the battery and pin 7 to the negative terminal, using clip leads or other suitable connectors. The two hand-holds are attached with another two clip leads. (One goes to ground on pin 7, the other to the loose end of the 1k resistor.)

Schematic Click Here to see Schematic in separate window

Zapper Schematic Diagram

*Note: we have improved marginally on the design by replacing the 100k resistor in the schematic with a 220k resitor and the 1000pf capacitor with a 100pf capacitor (see parts list above). The 220k resistor in combination with the 100pf capacitor produce a nominal frequency virtually identical to Dr. Hulda's original Zapper schematic. Dr. Hulda says in her book that frequency is not important, but we thought you might appreciate this anyway.

The above instructions are clearly not the only way you can do it. You can, for example, solder all the components directly onto a 14-pin socket or onto a piece of electronic perf board, like we do in our ready made version. This is a lot more time-consuming and difficult for most people, which is why we recommend a breadboard. As mentioned above, the resistors and capacitor don't all have to be the exact values mentioned here to make a working Zapper. However, any variation in capacitance or resistance will affect the output frequency. (There are limits on frequency and power consumption that the chip can handle, so don't stray too far from the specified values.)

If you have access to an oscilloscope you can use it to check your Zapper output when you are finished.

Click here to tell your friends how to build a zapper!

Get ready made Zappers here.


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