Dwight Aplevich writes:

Circuit_macros5.1.tar.gz has been copied into the incoming directory of ftp.tex.ac.uk. Its expanded contents are to replace the contents of graphics/circuit_macros. The copyright is almost public domain.

From the README: ... This is a set of macros for drawing high-quality line diagrams to include in TeX, LaTeX, or similar documents. The macros were originally intended for electric circuit diagrams containing fundamental elements, amplifiers, transistors, and basic logic gates, but several tools and examples for other types of diagrams are also included. The advantages and disadvantages of such a system are similar to those of TeX itself, which is macro-based, non-wysiwyg, and which uses ordinary character input.

The macros evaluate to drawing commands in the pic little language, which is easy to read and learn. The programming elements in pic are well suited to line drawings requiring parametric or conditional components, fine tuning, significant geometric calculations or repetition, or to drawings that are naturally block structured or tree structured. Arbitrary formatted text can be included. Free TeX- and LaTeX-compatible interpreters for m4 and pic are readily available for Unix and PC machines.

View or print the file examples.ps in the examples directory, or try http://ece.uwaterloo.ca/~aplevich/Circuit_macros/

A collection of examples and hints intended for his colleagues has been produced by Alan Robert Clark at http://ytdp.ee.wits.ac.za/cct.html ... CHANGES: Version 5.1: Signal-flow graph (directed graph) macros. More consistent rot3Dz. Work-around for a bug in some pic processors invoked by the battery macro and for an arc instability invoked by the fuse macro. Modified ground, dimension_, par_, label macros, b_current, diode, transformer. New macros gpar_, ujt, scr, contact, relay. Document fixes and additions. Changes to examples for portability. ...

i have installed the files as requested: thanks for the upload.

Robin Fairbairns

For the CTAN team