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Re: gEDA-user: European symbols?
Den 2011-01-01 18:42:49 skrev kai-martin knaak <kmk@xxxxxxxxxxxxxxx>:
Johnny Rosenberg wrote:
here's a
new try, which I tested several times:
http://ubuntuone.com/p/W8l/
I just looked at 7400-IEC-1.sym. Some comments:
* some lines of invisible text is not on 100 grid.
I took a look myself and you're right. I didn't make those though, since I
just modified an existing gate, so I guess they are not on â100 gridâ in
the original symbol files either, but I didn't check that yet.
I didn't add or modify any invisible text except those very unnecessary
(?) author- and license lines. I guess I should remove them entirely.
* the footprint attribute is invisible
Didn't change that either. Why would you like them visible?
* pin labels are invisible
* if pin labels were visible, they'd collide with the box
* pin length is 200 units. IMHO, these lengthy pins result in
awkward artwork, when there is little space on the canvas. This
is of course a matter of taste.
200? Strange. Strange. Looks like 300 to me, except the output pin, which
indeed is 200. I didn't change that from the original symbol either,
though.
Actually, the only thing I changed was the shape of the box, and I added
an & sign insideâ
* the slot attribute is invisible. I like to make it visible, so
it is explicitly shown on the schematic and can be edited on mouse
click.
* there is no value attribute --> this attribute is used in the bill of
materials
* the visible string 7400 is simple text. That way, it cannot be edited
in the schematic. In a real circuit it should read 74HC00 or whatever
flavor of TTL logic should be used.
* the supply nets are implicitly given with the net attribute. IMHO,
this approach hides information that should be visible in the
schematic. I prefer to put the power pins in a dedicated 74er
power symbol.
* suggestion: If the symbol complies to a specific IEC norm. How about
a comment, that refers to the specific norm?
* what is the intended use of the attribute device=7400 ?
Don't know, I didn't add that, so it is probably the same as the original
symbol.
---<)kaimartin(>---
If it's not too much work, could you modify the 7400 symbol to your
likings and then send it back so I can modify the other symbols
accordingly?
--
Kind regards
Johnny Rosenberg
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