DIY Audio Equalizer Developed and Written by Gabriel Dantas. This article was written by a beginner for beginners in electronics. My name is Gabriel, and I am studying Electrical Engineering at the University of Brasilia (currently in my fifth semester). The objective is to share my learning process and mistakes while building a cheap, simple […]
DIY Poor’s Man Music Synth Developed and Written by Aman Deep. This project presents a digital monophonic square wave synthesizer and sequencer. In other words, a digital music synthesizer, or music synth. It is based on 555 oscillator and 4017 decade counter. This device offers a distinctive sound reminiscent of vintage video games and early […]
In this entry we change the subject, and we move from electronics to electricity. Or rather, to DIY. We explain how to move a light point externally, without works, obtaining an elegant and stylish result. The expected result can be seen in the cover image of this article. The text is structured with the following […]
The Black Swan is a best-selling book written by Nasim Taleb. Its main quality is to ensure that the reader sees the world in a different, much more insightful way, and it is therefore a must-read. Although focused on philosophy and economics, it can be analyzed from the perspective of any area or profession. In […]
The book Microwave Engineering by David M. Pozar is considered a fundamental reference in the field of microwave engineering. It is aimed primarily at advanced students of electrical engineering and telecommunications, as well as professionals in RF and microwave system design. Its purpose is to provide a solid understanding of the principles and applications of […]
Constant envelope modulations are of vital importance in radio communications due to limitations of electronic components. In practice it is necessary to analyze not only the symbols of a modulation, but also the transitions between them. For example, in a QPSK modulation, all symbols have constant envelope, but there are transitions between them where the […]
The envelope of a bandpass signal represents the signal, typically baseband, that served as the modulator of the carrier frequency. Although the power of the resulting signal may vary with time, its value can be generalized as a function of the envelope amplitude. The following text shows the evolution from the calculation of the power […]
Complex numbers extend the real numbers by adding an additional term called imaginary. This two-dimensionality makes it possible to simplify the understanding and calculations of many mathematical and physical questions. This article explains the basic fundamentals of complex numbers and their main applications for the particular case of electronics [1][2] and communications [3][4]. The table […]
Optical modulators use electrical signals to modify the physical characteristics of materials in such a way that the propagation conditions of light change. This article explains the most common optical modulators that are widely employed in optical communications. Firstly, Electro-Absorption Modulators are briefly describred. Secondly, electro-optic Mach-Zehnder Modulators (MZM) are introduced. Finally, the most relevant […]
Academic books in science and engineering tend to be expensive, both for students and professionals. When it comes to buying a copy of some of the most famous books in the field, prices are much higher than those of a conventional book. This phenomenon is especially relevant in emerging countries, where book prices in local […]