As long as slot machines have been using electricity to function cheats have been tempted to use electricity to cause a slot machine to payout. Today with electronically controlled machines there are several unique methods for trying to make a slot machine payout. Some of these devices/emp jammer delivered an electric shock to the slot machine, others are more elegant electronic devices that override the programming or disrupt the electronic circuitry of the slot machine.
EMP or Electromagnetic Pulses are pulses of Electromagnetic radiation that can disrupt electronic circuitry. High power pulses will destroy electronic circuits and low power pulses will cause circuits to behave erratically. It is this last result that the EMP jammer is trying to generate. When the EMP device is activated, the EMP that is emitted from the antenna will affect the unshielded chips in the validator.
CAUTION: THIS EMP JAMMER INVOLVES SEVERAL HUNDRED VOLTS WHICH MAY CAUSE HAZARD OR INJURY OR EVEN DEATH PLEASE DO THIS AT YOUR OWN RISK. THE USE OF EMP DEVICES IS NOT LEGAL IN SOME COUNTRIES. I made this device only for educational purposes.
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Courtesy: Kedar Nimbalkar