\documentclass[10pt,a4paper]{article}

% Packages
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\usepackage{multicol}           % Allows multicols in tables
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%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{whatthe}
\pdfinfo{
  /Title (electronics-analog.pdf)
  /Creator (Cheatography)
  /Author (whatthe)
  /Subject (Electronics Analog Cheat Sheet)
}

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% This two commands together give roughly
% the right line height in the tables
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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
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% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Electronics Analog Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{whatthe} via \textcolor{DarkBackground}{\uline{cheatography.com/18561/cs/1809/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}whatthe \\
  \uline{cheatography.com/whatthe} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 13th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Resistors}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{in series: Rtotal = R1 + R2 etc \newline % Row Count 1 (+ 1)
parallel: Rtotal = 1 / (1 / R1 + 1 / R2 etc.)% Row Count 2 (+ 1)
} \tn 
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\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{2.09034 cm} x{2.88666 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Ohm's Law}}  \tn
% Row 0
\SetRowColor{LightBackground}
V=IR & I= V/Xc \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Z=V/I & I=V/XL \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{THE (R) GETS REPLACED DEPENDING ON WHAT YOU'RE USING TO SOLVE}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.04057 cm} x{2.93643 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{RC Circuits}}  \tn
% Row 0
\SetRowColor{LightBackground}
Time constant & τ= RC \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
instanteous voltage & V= Vf+ (Vi-Vf) e \textasciicircum{}(-t/τ) \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
current & i= If+ (Ii- If) e\textasciicircum{}(-t/τ) \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
charging from zero & V=Vf (1-e\textasciicircum{}(-t/RC)) \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Capacitive reactance & Xc= 1/ 2pifC \tn 
% Row Count 9 (+ 2)
% Row 5
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Xc in series & Xc total= Xc1+ Xc2... \tn 
% Row Count 10 (+ 1)
% Row 6
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Xc in parallel & Xc= 1/ (1/Xc1) + (1/Xc2) +... \tn 
% Row Count 12 (+ 2)
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\begin{tabularx}{5.377cm}{x{0.9954 cm} x{3.9816 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Capacitors}}  \tn
% Row 0
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in series & Ctotal = 1 / (1 / C1 + 1 / C2 etc.) \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{parallel} & Ctotal = C1 + C2 etc. \tn 
% Row Count 3 (+ 1)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.58804 cm} x{2.38896 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Voltage Divider}}  \tn
% Row 0
\SetRowColor{LightBackground}
Vx= (Vs/Rt) Rx & Vx=(Rx/Rt) Vs \tn 
% Row Count 1 (+ 1)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.44333 cm} x{3.53367 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Inductors}}  \tn
% Row 0
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in series & Lt= L1+L2 etc \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
parallel & Lt= 1/(1/L1)+(1/L2)... \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
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% Row 0
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% Row Count 1 (+ 1)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Voltage across Capacitor}}  \tn
% Row 0
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\mymulticolumn{2}{x{5.377cm}}{Vx= (ct/cx) Vs} \tn 
% Row Count 1 (+ 1)
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\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}