This package provides a set of m4 macros for drawing high-quality electric circuits containing fundamental elements, amplifiers, transistors, and basic logic gates to include in TeX, LaTeX, or similar documents. Some tools and examples for other types of diagrams are also included. The macros can be evaluated to drawing commands in the pic language, which contains elements of a simple programming language, and is well-suited to line drawings requiring parametric or conditional components, fine tuning, significant geometric calculations or repetition, or that are naturally block structured or tree structured. Alternative output macros can create TeX output to be read by PSTricks, TikZ commands for use by the PGF bundle, or SVG.