When these pulses are sent out, they interfere with the proper operation of a given device, causing them to malfunction. In essence, an Emp Jammer circuit works by generating intense electromagnetic pulses that disrupt the normal functioning of electronic systems. It has been used for many years and it can be found in a variety of devices, including military applications, commercial security systems, and electronic payment systems. The Emp Jammer circuit is a piece of technology that is designed to jam electromagnetic signals.