In August 2022 my first aquarium started to leak after more than 10 years, therefore I had to order a new one which I designed together with a glass lid. Since my PICclock light control circuit was also getting old, it seemed a good time to develop the successor.

The making of a high quality audio amplifier was my long-term wish. It also gave me a motivation during study at university and encouraged me to think deeper about the circuits we had studied. When I got enough knowledge about circuits and simulation, I started making my own, beginning with a single transistor in voltage follower (Class A) topology then studying other amplifier circuits and in the end constructing my own topology from well designed amplifiers.

One can get infinite options of laboratory power supplies on the market, either a cheap Chinese one for few bucks or expensive high quality one. Why should I even bother making my own that will now be as cheap or good?

Up to now I have used only a simple scheduling that is excellent for simple embedded applications where interrupts are used for time critical operations. I wished to understand also how more complex systems work therefore I have studied and implemented a real time OS on STM32 microcontroller. And a phone is an ideal application for OS implementation since it needs to control many operations concurrently.

The most expensive part of a soldering station is a base which PWMs the sine signal from 12V or 24V transformer to regulate the temperature of the soldering tip. That got me thinking if I can make a much more affordable but a better designed base that would control quality and affordable Weller WMRP tips for micro soldering that integrate tip, thermocouple and heater in one piece and can be affordably bought for 25€.

My fishkeeping hobby has influenced me in making my own "real-time" clock timer, because I wanted to remove the hassle of annual replacement of T8 fluorescent lamps that quickly degrade and have harmful effects of UV spectrum. Furthermore, AC power line timers with relays have failed on me multiple times because of mechanical relay contacts. Therefore an idea of creating a custom timer and perfect spectrum LED lights for aquarium was born.

The project for RC Helipad was done as a part of highschool's final exam at subject Information and communications technologies. It combined my love for RC helicopters and introduced me into the world of electronics.