On Sat, Nov 06, 2004 at 05:42:12PM -0500, DJ Delorie wrote: > > > > Areas the autorouter shouldn't put traces through.
I'd expand that to autorouter or human router. > > > > What's the reason for such areas? > > Mounting brackets, component contact, EMI, isolation, etc. > > For example, on my furnace controller I didn't want the logic lines > getting too close to the power lines, so I manually drew big fat > tracks between them before routing. If I had keep outs, I could have > drawn those tracks on the keep outs and not had to go back and delete > them later. Another example is something like a microstrip filter or resonator. For proper operation, you may require that other copper stay some distance away. As an extreme example, consider some microstrip filter with a grounded stub. You'd hate it if an autorouter or sleepy human decided any piece of that metal was an OK place to ground something to. -Dan --
