I'd like to use the romano circuitikz style for drawings with analog and digital components. However, I encounter compilation problems when I insert a flipflop.

\tikzset{romano circuit style}

\draw (0,0) node[flipflop SR,anchor=bpin 1](FF){};

The compilation error is: ! Package PGF Math Error: Unknown operator `f' or `fl' (in '1.0 flipflops/thick ness\pgf@circ@Rlen '). See the PGF Math package documentation for explanation.

Commenting out the \ctikzloadstyle{romano} and \tikzset{romano circuit style} produces the output, though obviously not in the intended style. Interestingly, I've not encountered problems with other logic gates, just the flipflop.

Any ideas what I'd need to change/add?

  • Fixed in the released 1.2.6 version. Thanks!
    – Rmano
    Dec 23, 2020 at 9:05

1 Answer 1


In the style file (ctikzstyle-romano.tex) at the flip-flops section, commas were missing at the end of each line.

% flip-flops

I've solved the issue by placing the (adapted) *.sty manually in the same folder, and using input{..}. Styles were downloaded from https://circuitikz.github.io/circuitikz/


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