RE: [SI-LIST] : MECL System Design Handbook

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From: Larry Miller (ldmiller@rhapsodynetworks.com)
Date: Mon May 21 2001 - 11:13:14 PDT


Sticky pads from Bishop Graphics; precision grids (for the light table) from
Bofors.

I still have some of these in storage if anybody needs 'em. No warrantee on
the adhesive, though. Also very big for two-sided boards was red and blue
tape. You could do color separations in making the films.

Before that was RubyLith. The first (single-sided) boards we did at Ampex
had traces cut from the solid (red) sheets with X-Acto knives. I think this
stuff is still used in magazine artwork, though it may have disappeared even
from there.

I wonder what happened to the giant view cameras used to reduce the artwork
to film. Some of those were pretty amazing (pre-Gerber days), custom-built
and very expensive with HUGE lenses. One thing in particular I remember was
an oscillatory film plate holder to move the film in a circle for anti-pad
clearance. Ground planes were a very extra-cost item.

And of course before the Shipley process for plating through holes you had
two-sided boards with vias made from swaged eyelets.

Mollycoddled youth!

Larry

-----Original Message-----
From: Greim, Michael [mailto:mgreim@sonusnet.com]
Sent: Monday, May 21, 2001 9:57 AM
To: 'Ken Cantrell'; Ingraham, Andrew; si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : MECL System Design Handbook

Don't forget those lovely donuts and a nice sharp
exacto knife for those properly mitered corners.

Kids have it so easy nowadays. Sheer luxury I tell you.
When I was a young man I had to tape boards in waist deep
snow, standing barefoot on broken glass uphill in both
directions. I digress.........

obligatory 8-)

Best Regards,

Michael C. Greim Sonus Networks
mgreim@sonusnet.com 978-589-8336

Making the world safe for digital signals everywhere

And all this science I don't understand
It's just my job six days a week

The time is gone. The email's over
Thought I'd something more to say......

From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Ingraham, Andrew
Sent: Friday, May 18, 2001 8:53 PM
To: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : MECL System Design Handbook

> (Don't forget, the revision date on the hanbook, or at least on the PDF
> I downloaded, is 1988.) ...

My hardcopy version of the handbook (which I can't find right now) is older
than that.

Some of the research work is probably from the 1970's. Many ECL boards back
then were simple double-sided (2-layer) with ground plane on one side and
signals on the other, hand routed using sticky black tape for the traces.

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