Circuit_macros5.2.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 5.2: New macros arrowline, nport, vlength, boxcoord, reversed.
Improved s_box, sfg_init, cross, fitcurve, sinusoid, transformer, darrow,
mosfet, psset_, battery, diode, capacitor.
...
i've installed the files as requested. thanks for the upload.
Robin Fairbairns