[Xcircuit-dev] RE: XCircuit connectivity

[R. Timothy Edwards]

Dear Roland,

> How does xcircuit infer connectivity?  I'm having trouble with
> xcircuit's netlist showing a lot of "extNN" networks which should
> have been part of another network.
>
> The problems seem to mostly be where I have more than just a
> point-to-point connection, e.g., three pins connect to a common point.
> E.g., I made a full-wave bridge rectifier out of 4 diodes and each
> apex in the diagram has three connections---the two diodes plus
> another wire.  But xcircuit's pcb netlist shows only two connections.
> Is there some trick to getting it to see all three?

Sometimes there are a few tricks, but more often there's just a bug
in the code. . .  In this case, if the bridge rectifier has the
diodes positioned in a diamond, then the diode endpoints may not be
touching the wire.  There is some "slop" in the calculation of which
wires connect to each other, but it's only a heuristic.  If that's
the problem, then increase the resolution of the snap-to grid ("-"
key) and get the wire endpoints directly on top of each other.  If
that's not the problem, then send me the file with the problematic
circuit, and I'll figure out what's going wrong.

					Regards,
					Tim


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