Mail Archives: geda-user/2013/04/29/13:40:28
On Mon, Apr 29, 2013 at 12:02:28PM -0400, Stephen R. Besch wrote:
> On 04/29/2013 11:47 AM, DJ Delorie wrote:
> >The solution is to make each "via" you're wiring to, a separate
> >one-pin symbol in gschem. Give them all different refdes's (don't end
> >in a lower case letter though ;) but the appropriate pin number, and
> >you can place them wherever you want but they still count as
> >"connected" in gnetlist.
> >
> >Note: this means in your schematic you'll need to have N different
> >one-pin symbols, modified for the appropriate pin numbers, at/near
> >your tube symbol.
> >
> >
>
> Here is at least on other alternative solution. Simply make a
> footprint with the number of pins required by the tube. Tou can
> arrange these in a circular pattern to match the tube socket
> layout(1), or, as suggested above, just a linear array (probably
> better if the tube is some distance away). You can then mount the
> socket anywhere you like - above or below the PCB, even placing a
> large hole in the center of the footprint for the tube itself to go
> through. You still have the soldering issue though. I suspect that
> you want the tubes acoustically isolated to prevent issues from
> microphonics. You might consider using the small pin-sockets
> available from MillMax (have a look at these:
> 0677-0-15-15-30-27-xx). You can get them from Digikey (ED90103-ND)
> in unit quantities. Once mounted on the PCB, just push wire loops
> from the tube sockets into them. I have used this technique to mount
> Flash tube trigger transformers as well as small daughter cards on a
> PCB.
>
> 1) Getting a circular pattern may be a bit tricky. I'm not sure if
> PCB has a built in algorithm for circular pin arrays. If not, simply
> calculate the positions based on a unit circle centered around the
> footprints (0,0) point.
It doesn't, to my knowlegde, but you can use the "Arbitrarily rotate buffer"
menu entry to get the same effect.
Gabriel
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