schematics

John Larkin · 2015-06-04T19:34:09+00:00

I had a customer complain that part values shown on our schematic don't match the BOM. We never reissue a released schematic of a given rev letter. Different versions (dash numbers) of a board can have different stuffing, and that's defined by the BOM for that rev and dash number. One PCB can have multiple BOMs. An ECO can also change part values, and we update the appropriate BOMs, with a comment to note the event. We treat the schematic as a reference drawing that not control configuration. The BOMs and assembly drawings control configuration. I know that some people do update the visible part values on a schematic if an ECO changes something. And I assume that if they have multiple versions, each stuffing option would have to have a corresponding, up-to-date schematic. Lots of schematics, maybe. What do you do? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com

Jun 04, 2015 41 Replies

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John Larkin 11 years ago

It's the general interchange format between high-end cad programs.

The files are all ascii, very prolix, enormous. They zip nicely.

Our PADS parts are all 2D. If we want a 3D model of a PC board, we use SolidWorks, starting with the DXF from PADS. We dump in 3D models of things like connectors and PEMs and such, things that interface with panels and boxes. If we wanted to show the ICs and such in 3D (which we rarely do) SolidWorks would let us stretch parts vertically.

SolidWorks is great fun. The viewer is free. Given a model, you can spin it in space and peek inside and stuff. The viewer won't let you

*get* inside and look around, which the full version does. It does allow slices, which can be useful.

Like this:

formatting link

Lots of nanohenries.

John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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