Scaling in CircuiTikZ

Just to summarize:

My answer:

It could be done with the "transform shape" option: \begin{circuitikz}[scale = 'some_scale_factor', transform shape]

Martin's answer:

Wrap the whole thing in a \scalebox{<factor>}{..} (graphicx package) or \begin{adjustbox}{scale=<factor>} .. \end{adjustbox} (adjustbox pacakge).