Electronic Kit & Parts
for Educators, Researchers & Hobbyists
your Zapper Kit into a Dial-A-Zap
If you are interested in
experimenting further with our Hulda
Clark Zapper Breadboard Kit, it is quite easy to turn the
circuit into a device we call a Dial-A-Zap. By
adding a 1 Meg Ohm Linear Taper Potentiometer to the circuit, the user
can adjust the output to vary the frequency from 150 Hz to 300,000 Hz,
with many frequencies in between.
If you have already built
the 30 kHz version
of the Breadboard Kit,
all you would have to do is remove the (Yellow-Violet-Red-Gold) 4.7K
ohm resistor found on the Breadboard at G9-J10, and replace it with the
1 Meg Pot to have a variable output. Each potentiometer will also need
a big plastic knob to make it easy to control the frequency. You can
get Potentiometer and Knob from Radio Shack. Shaft on potentiometer
fits through a 5/16 inch hole and you cut the shaft to length to fit
the container that holds your final project.
In order to read the output
on your Dial-A-Zap, one will need a Multimeter with Hz setting to act
as a digital frequency counter (available at Radio Shack for about
$50). Use alligator
leads to connect the circuit outputs to copper
pipes, and connect the multimeter to the pipes as well. This
way you can read the frequency output on the multimeter (set multimeter
to Hz setting). This is one of the most cost effective ways to have a
nice little battery operated frequency generator without spending $500
1N914 Switching Diode to protect circuit
Plastic Project Enclosure
Multi Meter with Hz Setting
Another way to create variable
frequency output using your breadboard zapper is to exchange the 4.7k resistor
with other resistors. Here is a free PDF
chart of which resistor to use in order to convert the breadboard to
to help guide you.
The Hulda Clark Zapper has
not been licensed as a medical device by the US
FDA. Zapper Kit is sold as an educational tool only, no
medical claims are intended by the sale of these electronic parts. Our
Zapper Kit is a great project for a school science fair, or to learn
the basics of building simple electronics.
Please note that when
ordering electronic parts and kits we can assume no liability on the
customer's ability to use them. Safety, craftsmanship, experience, and
ability are the user's responsibility.
Electronic parts are
small and fragile. We can not offer refunds or replacements on
electronic parts. Buy electronic parts and kits only if you believe you
can accomplish the work. If you experience difficulty with your build,
or have little experience in electronics, please order replacement
parts along with your kit.
The 555 CMOS Timer is the
most likely part to need replacement, so it may be smart to order
extras when building a kit.
The 555 CMOS Timer is
vulnerable to static electricity. If you walk on a carpeted floor and
the 555 receives a static shock it may burn out and need replacement.
are sold separately for those who want to have several at hand during a
kit build, or to troubleshoot a circuit that is not working. If you are
new to electronics, or just want to be cost effective, you may want to
purchase extra 555 CMOS Timers when building your first kit. We can not
offer refunds or replacements on electronic parts.
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