Realizing a functional device on biologically degradable circuit board

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Dr. Géczy Attila
Department of Electronics Technology

Nowadays, environment pollution is one of the most urgent problems of the society. In every segment of our lives we need to find eco-friendly solutions, in the way of living, and also in the manufacturing. Electronic devices are playing a role of great importance in our daily life, but they create large amount of electrical toxic waste. In order to protect the environment, the waste reduction should be a purpose of development. In my paper I present the biodegradable materials, highlighting three types: polylactid acid (PLA), cellulose-acetate (CA) and sugar-based epoxy (bioepoxy). I write about those difficulties that cause problems during production. Their main disadvantage compared to the usual FR4 PCB boards is the low melting temperature. I summarize the works of previous years of the Department of Electronics Technology. The aim of my thesis is to create a functional device using these biodegradable materials. This device is a freely accessible MP3 player with circuit diagram, and software. For the control of the device a 18LF2550 PIC from Microchip, and a VS1011e audio decoder IC from VLSI are responsible. The files are on a SD card, and the device can be controlled by switches. I test the MP3 player on the test board, and after the successful testing I choose surface mounted parts, then I make printed circuit plan in PADS software. I build this circuit first on FR4 PCB boards and I mount the parts with a pick&place machine. I prepare the soldered joints with hot gas heater. After the test I prepare the MP3 player on two types of biodegradable materials; cellulose-acetate and sugar-based epoxy. I introduce the process of manufacturing of bioepoxy and CA circuit boards in detail. Afterwards, I evaluate the solder with optical and X-ray microscopy. I qualify these soldered joints on the three materials (FR4, CA, Sugar-based epoxy) and make suggestions on development possibilities of the manufacturing of boards.


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