National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Study of dielectric relaxation in PCB substrates and cable insulation
Ježík, Jan ; Brzobohatý, Jaromír (referee) ; Běťák, Petr (advisor)
This study investigates relaxation polarization in some dielectric components of tester UNISPOT S40 developed by company UNITES Systems a.s. Relaxation polarization in the PCB substrates and in tester’s cable insulation causes undesirable deceleration of some test steps. Relaxation polarization in selected PCB substrates and various cables are examined by method of dielectric relaxation spectroscopy in the frequency domain and by measurement of polarization or depolarization current.
Control system for temperature stabilization
Malý, Pavel ; Běťák, Petr (referee) ; Kadlec, Jaroslav (advisor)
This bachelor´s thesis is engaged in problems, programming and proposal of Control system for temperature stabilization of any system. Main condition is using the Peltier´s component and microcontroller. Principle consists in setting of temperatures by user controls and operating of Peltier´s component thought MOSFET semiconductors. This MOSFET´s are designed to an H-bridge. We regulate power of Peltier´s component by the H-bridge. Main part of the circuit is microcontroller from ATMEL. This is called ATmega16. It’s programmed by ISP (In System Programming) property of microcontroller, which is necessary for programming of microcontrollers in applications. All measured and controlled values will be showed on the LCD display and should by supply by the 5V power source.

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