National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Tunable loop antenna for ham radio
Šmerda, Jaroslav ; Šrámek, Petr (referee) ; Lukeš, Zbyněk (advisor)
This bachelor thesis is focused on the design and construction of loop antenna that can tune the stepper motor using capacitors. The antenna is designed for short waves used by radio amateurs. My task is to establish an antenna tuning using 4-position stepper motor controlled by a microprocessor, which will set the stepper motor to the positions that will change the capacity of capacitors needed to tune the antenna for the frequency band.
Measuring the velocity of projectiles by laser beam
Šmerda, Jaroslav ; Šebesta, Jiří (referee) ; Lukeš, Zbyněk (advisor)
Muzzle velocity is the speed of bullets, guns at the moment it leaves the barrel of a gun. Since this is a parameter related to the storyline, which takes place only shortly after the bullet leaves the barrel, this figure is the transition ballistics. The aim of this work is to design and construct a device for measuring the speed. Measurement consists in measuring the interval at which the bullet crosses the two laser beams. From this data, the performance will be calculated.
Switching LED Driver Using Buck-Boost Structure
Šmerda, Jaroslav ; Kincl, Zdeněk (referee) ; Kubíček, Michal (advisor)
Control and driving high luminous LED is an issue that is dealt, because the technology of LED have grew in recent years. The power of these diodes is supplied almost always with DC converters. These converters operate on the principle of switching power supply, and they are devices with high efficiency. Because of the high efficiency of converters in combination with a high luminous LED leads to very efficient energy processing to light. This project describes how to select the right converter for a specific application of LEDs. There are described basic converter topologies, descriptions of their activities and LED wiring example to the converter.

Interested in being notified about new results for this query?
Subscribe to the RSS feed.