On Mon, Dec 12, 2005 at 02:41:05PM -0200, Xtian Xultz wrote: > Em Seg 12 Dez 2005 14:12, Larry Doolittle escreveu: > > On Mon, Dec 12, 2005 at 09:27:22AM -0200, Xtian Xultz wrote: > > > I dont understand why the refdes appears here in > > > Helvetica, and the values in Times. Strange. > > > > User choice. From your perspective, maybe "operator error" is > > a better description. The font choice is made in the symbol, so > > changing it would take three steps (inductor, resistor, capacitor). > > I dont know if standards about electric symbols dictate something about that, > anyway I dont think this must be a user choice, it must be a stabdard choice. > My opinion, of course.
There is a default, of course. I don't even remember what it is.
This is Unix .. the operator can always override the defaults.
> I have never seen a schematic in the industry with a font that was not
> Helvetica ou Arial...
Xcircuit is first intended to produce journal-publication-ready images,
and journals like Times fonts. The fact that the schematics are also
useful is something of an afterthought. ;-)
> > The value is centered, which forces the refdes off center.
> > Symmetry is restored when there is an additional modifier
> > added, such as "NPO" for C103 [chop].
>
> My particular symbols only have refdes and value. Other attributes are all
> hidden. I think in the draw only the most important informations must be
> there. The type of the component, like NPO, IMHO, must be in the BOM or TOC.
> So, my symbols for discrete components have only refdes above and value
> below, centered with the center of the symbol, and on the right.
Having just come back from an Edward Tufte [1] lecture, I will raise
my assertiveness on this point a notch: the schematic is documentation.
If it's important that the resistor be 2W, or the capacitor be NPO,
don't send the reader to another sheet to find that out! Down that
path lies madness. Yes, you need a real BOM with an orderable part
number before you can actually get a contract assembly house to put
the damn thing together. OTOH, the essential engineering of the
design needs to be captured on the schematic, so somebody can check
whether the BOM makes sense! Your power supply schematics need
commentary on peak output current and acceptable ripple. I'll
attach another example, where the signal levels in a premplfier
chain are documented _right_alongside_the_devices_!
- Larry
[1] http://edwardtufte.com Highly recommended; well worth the full
day and US$320.
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