Learning the Art of Electronics, Week 1

Week 1. Ohms law, power, Kirchhoff`s law V,I. Ohm`s law V=IR. So what is a Volt ? Potential energy per unit charge or work done to move a charge against electric field, form one potential to a higher potential. Dynamic resistance Rdynamic= ΔV/ΔI it is the local resistance - the tangent to the slope of the device V-I curve. Power P=I×V or derived: P=I²R or P=V²/R Kirchhoff`s law: sum of voltages around circuit is zero, sum of currents in and out of node is zero. Parallel resistance: Rtotal = (R1×R2)/(R1+R2)…

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Learning the Art Of Electronics

I have decided to get my self together and systematize my knowledge of electronics. It is very similar situation as for this guy. Electronics is my hobby. And actually one of many hobbies. I would say I have a lot of knowledge it but there are plenty of gaps and places just for intuition. Especially in circuit design. Once I have purchased a book "Learning The art Of Electronics" and used it as reference for this and that but never when through it. But this is it. My goal is…

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Materialized view support in different DBMS

Some notes regarding materialized view support in different database management systems. Materialized view is a database object that stores a snapshot of database query. If a regular database view could be seen as a "window" - one looks through this window and sees actual situation of the data, then "materialized view " would be something like a "photo image" i.e., you take an image and can look at it even without going near window, but you only see situation that was on that particular moment picture was taken and if…

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Reliacinė algebra ir norminės formos

Kai kurie žymėjimai ir reliacinė algebra R={A1,A2,...,An} t.y, R yra lentelės L atributų aibė. Ai kur i=1,...,n yra lentelės atributas. Tada L(R) yra lentelės reliacinė schema. Lentelės eilučių aibę žymima l={e1,e2,...,em} kur n - lentelės stulpelių skaičius, m - lentelės eilučių skaičius. Kiekviena eilutė yra sutvarkytas reikšmių rinkinys ej = <a1,a2,...,an> ∈ l; ai ∈ dom(Ai), kur dom(Ai) yra atributo Ai domenas t.y, galimų reikšmių aibė. i=1,...,n j=1,...,m Atributų rinkinys apibūdinantis bet kurią lentelės eilutę yra vadinamas viršrakčiu. Viršraktis yra raktas jei pašalinus bent vieną atributą jis praranda universalumą. Taigi…

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First design for 3d printer
Hex key T handle Drawing

First design for 3d printer

My first design for 3d printing! You can find it on a thigverse: https://www.thingiverse.com/thing:3560965 So that is why it might be a bit over engineered, bu hey, it is fun so who cares ;) I had some hex type key for automatic yard gate engine disabling and it that plastic handle that got broken over time. So I figured out that this fix could be a good practice to learn Fusion and make my own handle design. Some design decisions and conclusions if they have worked out or not: Hex key…

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8086 disassembler using 64 bit assembly language

8086 disassembly application. Project done during computer architecture course. Project is done using nasm(yasm) 64 bit assembly and some c functions to handle input/output. I have chosen such technologies because I was curious about few topics: Learning about asm 64 bit programming Compiling assembly executable for windows 64 platform. During the comp architecture course we were doing assembly programming for a ms dos using dosbox. I was interested in making some executable code on a windows 64 platform. Linking assembly code to some higher lever programming language library. During the…

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Ubuntu install Clojure

sudo apt install default-jre sudo apt install openjdk-11-jre-headless sudo apt install openjdk-8-jre-headless sudo apt install leiningen lein repl //Install IntelliJ IDEA snap install intellij-idea-community --classic --edge intellij-idea-communituy

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