John Fields wrote:

On Mon, 07 May 2007 23:23:50 GMT, Joerg
wrote:


John Fields wrote:


On Mon, 07 May 2007 22:49:35 GMT, Joerg
wrote:



John Fields wrote:


On Mon, 07 May 2007 21:06:43 GMT, Joerg
wrote:




Spehro Pefhany wrote:




On Mon, 07 May 2007 13:12:56 -0700, the renowned John Larkin
wrote:





On Mon, 07 May 2007 12:44:17 -0700, Joerg
wrote:





Jim Thompson wrote:





Anyone know of a cheap (or free) Timing Diagram tool?

I need to communicate with my digital counterparts on an IC design ;-)


Arie's hint is great. But it'll be lots of typing. If it isn't for doc
purposes but just for mutual understanding there is an easier way. This
Saturday me and my layouter (with him being in Vermont) just could not
get onto the same page with a weird kind of laser diode mounting
(z-bend, then rotate a bit and lay flat over some discretes).

So I sketched it up, scanned that in and zipped it over. Tada! Problem
solved, layout is now done. But the fab people haven't come back with a
quote for hours now. Hope that doesn't spell trouble.

I sketch on grid paper, photograph, and email. One of my customers
jokingly asked me what CAD package I use, and I answered "Sharpie."

John


Nothing works like quadrille paper, pencil, eraser, ruler and eraser
shield until you get the concept settled. Then, and only then, is CAD
productive, IMHO.


Agree. Except that I don't know what an eraser shield is. Do I have to
feel dprived now?


---
LOL, on the contrary, if you don't know what an eraser shield is you
must be a genius working with India ink from the start.


At the university we were forced to use ink pens. The tricky ones from
Rotring or Staedtler that would only work if held at exactly 90 degrees
to the vellum, would leak a lot and dry up in no time. Plus ruin the
occasional shirt. Same during the internships that were mandatory. So
yeah, I kind of got used to that.


---
I was just kidding, and I wasn't referring to formal drafting. The
premise was that if you can do logic design with an ink pen (ergo,
no easy erasure available) then you must be able to get it right the
first time out, ergo you must be a genius.
---


Whenever I was working up that uppity genius feeling gravity struck.
There have been times where I had to use a razor blade more than once in
the same spot. The first instance could be somewhat muffled by rubbing a
fingernail over it but the 2nd razor application definitely showed. By
the 3rd there was a hole...

The ME guys had some kind of "cheat vellum" where you could peel off a
layer and it almost looked as if nothing ever happened. Very expensive
though but it did prevent the ink from frazzling out too much. Somehow
many of them had more money than us EEs.


Long before CAD came on the scene, these were my two best friends:

om

The logic template was the bugger and the eraser shield was the
debugger.


For some reason those links don't work for me. When I click on these
nothing happens :-(


---
Oh, well...

I posted it here (abse) as "Eraser shield and friend."


abse seems to roll off the servers at a fast clip.


---
The file's nearly a couple of megabytes long, so maybe your ISP has
some rules which are keeping you from getting it.

If you like, send me your email addy and I'll email it to you.


Tried Google as well, it seems to be gone from their servers as well. My
email is jsc AT analogconsultants DOT com.

--
Regards, Joerg

http://www.analogconsultants.com