Luka Đorđević

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Personal Engineering projects

Instrument and probe organizer
This was a really quick and simple project I thought up on a whim. I was struggling to find space for my handheld instruments, LCR meter, multimeter, and oscilloscope probes as well as all of my banana cables for the lab power supply. The solution is quite simple, it's just a wall-mounted wooden board with boxy 3D printed instrument holders and carefully positioned hooks to hang cables on.
[Summer 2024]

Instrument and probe organizer

SEPIC converter with analog control circuit:
Shortly after the day of the aforementioned conference I successfully implemented the PWM generator along with a few operational amplifiers to create a fully analog self regulating DCDC converter, whose voltage is set using one potentiometer. I made a miniature cuk converter as a source of negative voltage, and a triangle wave generator which was part of the initial PWM generator circuit. I never ended up properly writing a paper on this device, but I got to present my work at the Petnica Science Center's conference "A Step Into Science". [Winter 2023]

Triangle wave generator (left) and cuk converter (right).

Improved version of the SEPIC converter, this time with a proper MOSFET gate driver IC.

Picture taken during testing.

PWM generator with bootstrap MOSFET driver:
This project was something I worked on during a misguided attempt at making a curve tracer, intended for use in a switching mode power supply, creating a PWM signal whose duty cycle was proportional to a supplied input voltage (0-5V). The idea was that it would allow for high frequency switching (in the 300-500kHz range) in the power supply, that is controlled by a microcontroller that can't create a PWM signal of that high of a frequency. This circuit is what I ended up writing a paper about for the IEEESTEC student conference at the Niš Faculty of Electronic Engineering, as I wasn't able to complete a regulated SMPS in time. [Autumn 2023]

Taking oscilloscope measurements of the square wave output.

Brushless DC motor driver:
Simple BLDC driver I made shortly after acquiring my first analog oscilloscope. It was mainly an educational project and for that reason I used discrete N-MOSFETs as switching elements and I made the bootstrapping circuits used for high side switching. While limited in speed, it's a functional motor driver that fulfilled the main design goals - making the motor spin and having adjustable speed. [Spring 2023]

Video demonstrating BLDC driver functionality.

Homemade CO2 laser cutter:
A diy laser cutter fully designed and built by me. While the enclosure and fume extraction systems were never completely finished, the laser cutter is functional and was a great learning experience. It's my first larger and mostly finished project. [Summer of 2022]

Full assembly modeled in fusion 360

Initial assembly of laser cutter in my room.

Example product I made with the laser cutter.

Experimenting with passive exoskeleton:This was a casual and simple project. I wanted to see if using a simple configuration of elastic tubing, steel cable, could be used to make a passive exoskeleton for the purpose of alleviating load on the knees. I didn't have the resources to do rigorous testing, but a proof of concept prototype was made. [Spring of 2022]

Concept 3D model.

Prototype demonstration.

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Professional experience

Student Associate - Hamburg University of Technology:
I'm in charge of holding a monthly soldering workshop at the WorkING lab at the Hamburg University of Technology. The general concept is "for students by students", and during my workshops I get to share my knowledge of soldering with my fellow students, in whatever form I think is best. During my workshop the attendees get to solder many different components in different packages on a PCB I designed, after which they are left with a fun circuit board that blinks red and green, and can be played like a keyboard. Other than holding the workshops themselves my tasks include keeping track of our stock of parts and making sure we have enough at all times. [April 2025 - pres.]

Helping an attendee test their board while others are still soldering.

Junior Teaching Associate - Petnica Science Center:
The Petnica Science Center hosts many seminars, held in 3-4 sessions per year, primarily for high school students but also for 8th graders and college students. I participate in the organization of the Electronics Seminar and the Petnica Summer Science School as a junior teaching associate - I act as a mentor for a section of the papers written during our seminars, prepare lectures and lab exercises on fundamental topics in electrical engineering, and am there to answer any questions as well as to ensure our attendees are safe and comfortable. [August 2024 - pres.]

The team reviewing final presentations of the attendees

Helping an attendee with lab measurements

Electronics Teacher - little school of electronics:
Having attended classes at the little school of electronics when I was a child, I was thrilled to have a chance to work there. I was in charge of holding the classes for children ages 6-13 using a practical approach to guide them through electronics, from simply turning on an LED, to using integrated circuits to assemble a 7-segment display counter. [Spring 2023 - Fall 2024]

3D printing gigs:
I have provided a 3D printing and assembling service, making decorative elements and miniatures for painting workshops, for Sport Vision - a company specializing in sports equipment. [Spring-Winter 2022]

3D printed shoe after painting workshop

Decorative elements for the photo booth

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Academic work and publications

Automatic Regulation of SEPIC Converter - A Step Into Science 2023, Petnica Science Center:
During this conference I was able to present my work in developing an analog voltage regulator for a SEPIC DCDC converter as part of the Electronics Seminar. It was a chance to learn from others, share my own knowledge, and make my first conference poster.

High Frequency PWM Generator and MOSFET
Bootstrapping Circuit - IEESTEC 2023, Niš Faculty of Electronic Engineering:
This was the first paper I wrote, and it covers the functioning principles of, as the name says, a high frequency PWM generator and MOSFET bootstrapping circuit I developed and tested.

B.Sc. Engineering Science - Hamburg University of Technology
I'm studying Engineering Science at the Hamburg University of Technology, I feel that getting a broader engineering education is invaluable when working on interdisciplinary engineering projects (aka all engineering projects), while my focus is electronics engineering, I still try to pick up as much as I can from other fields.
[2024-pres.]

Petnica Electronics Seminar - Petnica Science Center
I attended the Petnica Electronics Seminar since its inception. There I had the chance to hear many interesting lectures, but more importantly to use lab equipment I couldn't access anywhere else and be in an environment completely dedicated to improving your own knowledge. By attending the seminar I was able to further improve my understanding of electronics and attend 2 conferences. [2022-2023]

In Step With Science Summer School - In Step With Science
At this summer school I didn't learn as many things specifically related to electronics or engineering, but I had a chance to work on a group project and participate in (and win) a small competition with a great team of my peers. [Summer 2022]

Electronics and Robotics Course - Little School of Electronics
This was a course I attended for many years, it was my first real introduction into engineering and specifically electronics. In it I learned to read circuit diagrams, build an intuition on how different electronic components "behave in circuit", work with Arduino IDE and Arduino devboards to control DC, stepper, and servo motors based on input from many different kinds of sensors. I consider this to be one of my most valuable experiences due to how young I was when I started (only 9 years old) and how much practical work I got to do - every lesson had some theory but most of it was us making breadboard circuits and trying to troubleshoot our mistakes. This paved the way for me to further increase my knowledge by learning on my own, and to truly get the most I could from all future courses I attended. [2014-2019]