On Thu, Sep 21, 2006 at 01:48:48PM -0400, DJ Delorie wrote: > > > > Double sided, 0.062. > > > > How quaint. ;-) > > Yeah, well, it's just going to sit on my desk anyway. Plus, it's > panelized with the challenge boards, so cost is an issue. I was extra > careful about adding planes to the bottom side, and bypassing all over > the place. > > The proto-pcb industry is starting to catch up with what hobbiests > want, but they're still way behind what high-tech boards demand. > > > The board I'm in the middle of bringing up is 6-layer, 0.045. > > The furnace board will be 4 layer 0.062 (it's cheapest). > > Oh, for checking part footprints, I've found the paste layers to be > most useful, at least for SMD parts. > > > Only if you work with slow parts. Edge speeds faster than 1ns are > > fairly common these days. > > Well, I want slower edges ;-) > > (And I can't afford faster tools) > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
If you can afford a 4 layer, you can definitely afford a faster scope. I think I have around $100 in my Tek 7903. It is a 500 MHz analog mainframe. It is actually 3 dB down at about 800 MHz and triggers to 1 GHz. It was dead when I bought it (blown pass transistor in the power supply, 3 shorted tantalums on the +15V rail), but working ones sell for around $200. The only bad things about it are that it has some ICs that are not available and is large and heavy. If one of the Tek ICs dies, I will just pick up a parts unit. Tek published schematics then, so repairs are possible. The 1 GHz 7103 tempts me occasionally. -- Darrell Harmon http://dlharmon.com _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
