American current source lines

Question

How can i do this circuit? What should i do to remove the initial line in the symbol of the current source? It uses the current American source from circuitikz package but the line appears at the beginning of the circle. I would also like to know how to place the node label that is between the two resistors.

Best regards, Max

Answer 1

Given that the current generator is used as a shape and not as an element of a path, we will use the node form of the element, that is, isourceAMshape.

But the task has a few tricky details, which I solved in the following way:

1. The trick of drawing the generator at the end is needed because it is red; otherwise connecting the border anchor of a red element to the black line has a little glitch (try it).
2. Line color and fill in circuitikz have to be specified one in the path, and the other in the element. Sorry. At least it's in the manual.
3. Labels are normally aligned at the baseline, a bit above the element, to take into account depth. Now, your labels have a lot more depth due to the comma and the sub- and super-script, so I have raised them a bit.
4. To avoid strange things on the $T_{fl}$ pole, better using a single path.

\documentclass[border=10pt]{standalone}
\usepackage[siunitx, RPvoltages]{circuitikz}
\begin{document}
\def\killdepth#1{{\raisebox{0.5\depth}{#1}}}
\def\labelsL#1{$#1_{\mathrm{fl,sp}}^{\mathrm{tc}}$}
\def\labelsR#1{$#1_{\mathrm{sb,fl}}^{\mathrm{tc}}$}
\begin{circuitikz}[
    american]
    \draw (0,0) to [short, -o] ++(0,-1) coordinate(tfl) node[below]{$T_\mathrm{fl}$}
          (tfl) to [generic, l=\killdepth{\labelsL{R}}] ++(3,0)
          to [short, i=\labelsL{Q}] ++(0,-1)
          (tfl) to [generic, l_=\killdepth{\labelsR{R}}] ++(-3,0)
          to [short, i<=\labelsR{Q}] ++(0,-1) ;
    \draw[color=red] (0,0) node[isourceAMshape, fill=white, rotate=-90](I){};
    % west is up (given the rotation)
    \node [above, red] at (I.west) {$Q_\mathrm{fl}^\mathrm{cd}+Q_\mathrm{cv}^\mathrm{rd}$};
\end{circuitikz}
\end{document}