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Mixing board with class-AB output amplifier
Krolák, David ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
Bachelor thesis deals with the type of mixer preamplifier with active tone control for each of four inputs. This preamplifier is used at dance parties, concerts and recording songs if it equipped with a line output for recording device. The thesis also includes design of power amplifier in class AB with output power 2 × 100 W at 8 nominal load, simulations and a summary of the results.
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Digital equalizer with dynamic range compression
Šafer, Radim ; Kováč,, Michal (referee) ; Brančík, Lubomír (advisor)
The aim of the thesis is to create a digital equalizer with dynamic range compression. The master's thesis is focused on the comparison of functions and parameters of individual digital processors which are given entirely for sound signals processing. It contains the detailed analysis of singular blocks used for signal processing in the circuit AD1953 and possibilities of control over programmable parametres of those blocks by a user. This thesis also contains a comparasion of the chosen A/D converters together with a description of the UDA1361TS circuit. A designed functional diagram of the final device is introduced as well. Thereafter possibilities of controling the individual blocks in the signal processor are mentioned. The final design of the digital equalizer is also introduced along with a description of software essential to a successful control over the processing of the signal in the AD1953 circuit. This thesis also describes a construction of the digital equalizer and involves results of the chosen measurements.
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Multifunction board computer for motorcycles
Netáhlo, Tomáš ; Tošovský, Petr (referee) ; Brančík, Lubomír (advisor)
Master’s thesis deals with a design and a realization of multifunction board computer for motorcycles. The goal of the device is measuring speed, rotation speed of engine, temperature of ambient, temperature of engine, temperature in intake including signalization of overvoltage and hightemperature. The device is completed by above standard function such as measuring titl of motorcycle, climbing of route, route recording and data transmission to the computer. The thesis includes a complete solution of hardware and software part of the device.
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Switched power supply with current limiting
Staněk, Michal ; Brančík, Lubomír (referee) ; Kubíček, Michal (advisor)
This thesis is focused on design and construction of switched mode power supply with continuous regulation of output voltage and current. The Power supply is designed as a switching power supply to reduce its weight and dimensions. To reach better parameters, it consists of two separate converters. The first one is isolated step-down controller with transformer. It supplies output the second controller (adjustable) and the measuring section with stable voltage. Input converter is designed as a simple single-transistor flyback converter. The TOPSwitch circuit was selected to reduce number of components. Output bench power supply is non-isolated buck converter with single transistor. For second converter the TL594 was selected as a control circuit, which typical aplication was modified to fulfill requirement of the bench power supply. Processor ATmega16 was used to show both required and actual values of current and voltage on a display.
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Design of correction preamplifier for conventional record-player
Košarišťan, Miroslav ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
The aim of the work is to suggest the correction preamplifier for conventional record – player, show preferences for these types of wirings. Schematic action vacuum tube, its division and marking are in the first part of the work, further work attends to theory pick – up head and recording characteristics, correction preamplifier, its corrections and design wiring with vacuum tubes. Next part of the work includes comparing wiring on base vacuum tubes and semiconductor base, where main emphasis on quality vacuum tubes sound is placed. Realization of correction preamplifier and creation of the printed circuit board in Eagle program is important part of the work. Part of realization is source anode voltage and filament power supply. Measured values, show modern record – players and power supply are mentioned in the end of the work.
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Preparation for function demonstration of basic types of oscillators
Venhoda, Jaroslav ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
Bachelor's thesis deals with basic types of oscillators. Oscillators were divided into groups in the introduction. For the practical implementation was chosen four different types of oscillators. For each type of selected oscillator was done circuit design. Subsequently, the design was simulated by PC software OrCAD PSpice. The proposal includes a possibility of the control device by switching between outputs and tuning oscillator's frequency.
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Design of dual regulated power supply
Moštěk, Jiří ; Kubíček, Michal (referee) ; Brančík, Lubomír (advisor)
This bachelor thesis deals with design and construction of a symmetric stabilized power supply provided with an adjustable electronic current fuse. The concept of source is chosen as a linear with two-output voltage ranges. The first range is possible to regulate the voltage from 0V to 20V with current limit 2mA – 4A or 2mA – 8A. The second voltage range allows you to adjust the output voltage from 0V to 40V with current limit 2mA – 4A. Included in this bachelor thesis is the simulation source, testing in non-soldering field, PCB design, commissioning, draft cooling and design of structural solutions. At the end of bachelor thesis are given the results of measurements laboratory resources and photos.
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Design of class AB stereo audio power amplifier
Zatloukal, Tomáš ; Polák, Ladislav (referee) ; Brančík, Lubomír (advisor)
The following work deals with design of class AB low-frequency amplifier, which is appropriately supplemented by correction Pre-amplifier and inrush protection circuit. The original schematic from prof. Leach was edited to fulfill task and to be easily completed from discrete components. The result of this work is the final design of power amplifier and correction pre-amplifier, protection circuit for speakers and power supply. As a next part, the design of printed circuit boards will be described together with assembling and mounting of boards in a construction box. Power amplifier will be verified by simulation and hardware measurements.
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