Re: gEDA-user: series terminators

[Darrell Harmon <dlharmon@xxxxxxxxxxxx>]

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)
> 
> 
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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


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