Mail Archives: geda-user/2013/04/29/12:11:05
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.
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