[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: gEDA-user: PCB Short and solder bridge elements.
Steven Michalske wrote:
> At work we have two elements that we use pretty extensively for making
> connections that are rarely configured.
>
> The first element is basically a surface mount device such as a 0603
> but are shorted through the middle. This is useful for filters that
> might need to be added later on and not needing a 0 Ohm resistor placed.
> It is also useful for placing a sense resistor for current in dev
> boards, and only add the component when necessary.
>
> The second element is basically a solder bridge. This is two pads
> placed close together without solder mask in between.
> This element I can make, it's relatively trivial
>
> The first element on the other hand is harder. I Want to have separate
> net names on each side of the element, and not have the connection
> checker declare the nets are shorted.
> The workaround i currently use is to draw up using normal 0603 parts
> and after my design meets DRC and has no shorted nets, I go through and
> manually short the elements.
> The dilemma here is that this is not error-proof, it also provides a
> dilemma when I accidently route a trace between pads on larger parts,
> think 2512.
>
> What suggestions can you folks come up with, is this something that we
> should build into PCB, the ability for an element to have two pins
> electrically connected, but be separate nets.
I think both of these are useful. For the solder bridge, what you
really want is a keepout layer so you can prevent (or cause a drc error)
if any traces ever go into the gap. For the 0 ohm jumper, I think what
you need is a layer that marks the underlying copper as a resistive
material. I guess the question is how to write the drc rules that
specify that no other copper can touch it.
-Dan
_______________________________________________
geda-user mailing list
geda-user@moria.seul.org
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user