Přístupnostní navigace
E-application
Search Search Close
Master's Thesis
Author of thesis: Ing. Ladislav Krivý
Acad. year: 2025/2026
Supervisor: doc. Ing. et Ing. Pavel Šteffan, Ph.D.
Reviewer: Ing. Vladimír Levek, Ph.D.
Premium HiFi tube amplifiers need to present state information to the user without compromising the clean visual design of the chassis. This thesis therefore develops a~compact embedded projector integrated into the amplifier body, projecting the user interface onto the surface below the chassis from a~height of approximately \qty{15}{\centi\metre}. The projected interface shows volume, input selection, tube warm-up progress and a~music-responsive audio visualisation. The solution is based on a~Displaytech LightView~201k LCoS microdisplay driven by an ESP32-S3 microcontroller through its LCD\_CAM peripheral and can be powered from the tube heater winding. The hardware comprises a~custom two-layer control PCB with linear power supplies, isolated stereo audio sensing using HCNR201 linear optocouplers, ambient-light-dependent brightness control, a~timed logic output for the customer's switching circuit, a~PCB-edge USB-C interface and an aluminium-core carrier for the high-power white projection LED. The firmware implements a~dynamically loaded graphical theme system and real-time FFT visualisation. A~companion desktop editor allows the projected theme to be modified without recompiling the firmware and updated over USB. Production data for small-series manufacture were prepared. Verification of the manufactured prototype demonstrated correct operation of the projection, user inputs, audio visualisation, brightness control and thermal stability; final mechanical integration remains a~follow-up step with the customer.
LCoS, microdisplay, embedded projector, ESP32-S3, HiFi amplifier, FFT visualisation, linear optocoupler, galvanic isolation
Date of defence
10.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
B
Process of defence
Student seznámil státní zkušební komisi s řešením své diplomové práce a zodpověděl otázky a připomínky oponenta. Dále odpověděl na otázky komise: Je špičkový proud 1,5 A pro napájení displeje? Není, napájí jen LED zdroj světla. Jaké nastavení zesilovač umožňuje? Volbu vstupního kanálu a hlasitost. Mé zařízení toto neřeší. Jaké elektronky jsou využity v samotném zesilovači? Nevím, není to součástí práce, kterou jsem řešil.
Language of thesis
Slovak
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Microelectronics
Study programme
Microelectronics (MPC-MEL)
Composition of Committee
prof. Ing. Radimír Vrba, CSc. (předseda) doc. Ing. František Urban, CSc. (místopředseda) prof. Ing. Vladislav Musil, CSc. (člen) RNDr. Ladislav Mareček, CSc. (člen) doc. Ing. et Ing. Pavel Šteffan, Ph.D. (člen) Ing. Josef Skácel, Ph.D. (člen)
Supervisor’s reportdoc. Ing. et Ing. Pavel Šteffan, Ph.D.
Grade proposed by supervisor: B
Reviewer’s reportIng. Vladimír Levek, Ph.D.
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová