I even considered high density SCSI stuff.
I have not seen a ¼ size 3 U, EuroCard
with 41612 after a lot of searchin. I’m sure they are probably out there
but it didn’t Google well. The 3 U unit is WAY too much real estate for
anything we are thinking about so far, and at $2.50/sq inch for a ‘manufactured’
board puts the 3 U unit on the expensive side (for hobbiest) projects.
I really do like the Hirose and is
available in almost all configurations we are interested in at 5-8 bux a
connector from Digi-Key in one quantity. Looks to me like the pin spacing and
density are about right with 80 positions, for home brew circuit boards. With the
right MB and an extruded case of the right length, we are in business. Actually
we are in business either connector style if we come up with a reasonable number
of connectors on the MB and our own motherboard to fit an extruded ‘slide
board’ enclosure. Preferable board style would be wider for the external
connections and shallow for minimal surface area in line with our smt stuff.
Behalf Of KD5NWA
Sent: Wednesday, January 04, 2006
Subject: Re: [Xylo-SDR] Some
design thoughts requested
The beautiful thing about EuroCards is they are available from 1/4 size
to full size, double and triple width also, so there is a lot of freedom when
you want to get a prototype board. And they are inexpensive.
At 08:57 AM 1/4/2006, you wrote:
Yep, DIN41612 seems like a good choice. I agree the DDR
impose too many restrictions for the type of use we intend to put them
to for the Xylo stuff (physical insert/remove cycles and 1.27mm board
73 de Phil N8VB
On 1/4/06, Leon Heller <email@example.com> wrote:
> ----- Original Message -----
> From: Eric Ellison
> To: 'Xylo-SDR Discussion'
> Sent: Wednesday, January 04, 2006 12:04 PM
> Subject: Re: [Xylo-SDR] Some design thoughts requested
> John Phil
> Thanks, back to the drawing board! Seemed like a good idea, but with these
> limitations, I doubt that we would want to do it this way.
> Looks like we are back to indirect connectors, like DIN41612. They use
> standard thickness PCB material, are designed for multiple insertions, and
> are even replacable (with the right equipment). They have been used for
> years on VME systems, which are still very popular in military equipment.
> The single Eurocard is a nice format (160 mm x 100 mm) with 32, 64 or 96
> pins, and may be scaled down to half-length, or less, for smaller systems.
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I fail to see why doing the same thing over and over and getting the same
results every time is insanity: I've almost proved it isn't; only a few more
tests now and I'm sure results will differ this time ...