Graham, you're probably going to start feeling that you are being dumped on (smile). I regret to say that this is a practice we use here to better our chances of passing emissions testing. Craig Cullum, Engineering Technologist, AMTELCO e: [log in to unmask] [log in to unmask] f: 608 838 8367 v: 608 838 4194, or 4197, x128 Please visit us at www.amtelco.com > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood > Sent: Thursday, July 30, 2009 9:03 > To: [log in to unmask] > Subject: Re: [TN] Hashing-Out Hatching > > Actually that is the HDI method that is becoming more and more popular. > Via-in-pad, internal routing and external GND planes. > Ken > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins > Sent: Thursday, July 30, 2009 9:58 AM > To: [log in to unmask] > Subject: Re: [TN] Hashing-Out Hatching > > Ha... We had a designer at one time who thought that surface traces were > bad, very bad. So every pad for every part had a short trace that > immediately went to a via and the signal was routed to an inner layer. > Seriously. That guy needs your doctor... > > regards, > - Graham Collins > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of James Head > Sent: Thursday, July 30, 2009 10:50 AM > To: [log in to unmask] > Subject: Re: [TN] Hashing-Out Hatching > > > Gary brought me back to the days when, just for kicks, I would take other > > guy's designs and remove all of their vias, just to prove I could do it. > I've > > gotten help, I'm cured, a thousand vias is nothing anymore. > > You should pass me the details of your doctor - I always spend a little > time > at the end of a project going through and trying to eliminate vias if I can > as I see everyone of them as a potential failure point - and it's very > satisfying to re-run the drill report and see the hole count drop! > > Mind you I'm not obsessive though. I worked with one relatively > inexperienced PCB designer once who spent a whole week designing a power > and > deflection PCB for a televison and managed to do it all without any vias or > wire jumpers. Unfortunately his design would never have worked with > segregation between the primary and secondary sides of the transformer and > 0.3 mm traces carrying high voltages and currents! > > James > ******************************************************** > > The information transmitted is intended only for the person or entity to > which it is addressed and may contain confidential and/or privileged > material. 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