A New Exam Cheating Shielding Instrument

This article has designed a instrument that based on swept interference to shield the communication of cheating device in examinations. The shield device using RC bridge-type oscillator to generate a sine wave, by varying its oscillation frequency, integrated voltage controlled oscillator LC resonant circuit produce raw vibration, signal multiplier circuits to achieve frequency multiplication, varactor and microprocessor control relay to complete the change of frequency, with a wide range sweep, sweep control accurate. The device has many characteristics such as a simple structure, easy to use and precise control, so one person cheats at any time or any band can