BUILDING A ZAPPER
11.Finally replace the lid on the box, loosely, and slip a cou-
ple of rubber bands around the box to keep it securely
shut.
- Optional: measure the frequency of your zapper by con-
necting an oscilloscope or frequency counter to the hand-
holds. Any electronics shop can do this. It should read
between 20 and 40 kHz. - Optional: measure the voltage output by connecting it to an
oscilloscope. It should be about 8 to 9 volts. Note: a
voltage meter will only read 4 to 5 volts. - Optional: measure the current that flows through you when
you are getting zapped. You will need a 1 KΩ resistor and
oscilloscope. Connect the grounding bolt on the zapper to
one end of the resistor. Connect the other end of the resistor
to a handhold. (Adding this resistor to the circuit decreases
the current slightly, but not significantly.)