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Cecil Yes, I’ll go back and look at
Eurocard standard. This looks great. GUD HUNTING! Thanks for all the links. One
way or tother I think we need a buss for our end product. Your point about size
of the boards we might want to manufacture is well taken. They should be able
to go on a little more than a postage stamp, and be VERY inexpensive to produce
- external connectors being the limiting size factor! One reason I was looking
at Memory Chip risers. I moused around a little today, and really
can’t see where I can justify Eagle Software in any serious production
version. So I’ll probably monkey around with Kicad, which is a really
nice GPL product. I mentioned earlier that there was some problem with the
Drill files, which they have corrected. Only benefit of Eagle IS the plethora
of template files available. I don’t mind eating on my lunchtime and
creating new parts! Good exercise and I am getting fatter! (No Testosterone!) Sparkfun has a pretty good batch deal for
prototype boards and also a lot of interesting new products. I like their little
3 buck power supplies. Also have a some 28 pin SOIC to DIP experimenter stuff
for about the same price. Other prototype boards can be had at: http://protoboards.theshoppe.com/index.html Will return! Viva the Project Eric From:
xylo-sdr-bounces@lists.ae5k.us [mailto:xylo-sdr-bounces@lists.ae5k.us] On Behalf Of KD5NWA I'll second the DIN connectors,they are very reliable, and come in
different sizes, single, and dual connector cards. I have used them in an
industrial environment and they worked flawlessly for years. But I'll go one
more step forward. ----- Original Message ----- From: Eric
Ellison Sent: Monday, January 02, 2006 5:17 AM Subject: [Xylo-SDR] Some design thoughts requested Folks Even since the PIC 4550 days I have
been thinking on how we might conduct experiments as well as have a reasonable
environment for adding on to the project. The obvious answer is a
buss of some sort. I have looked at everything from Simm riser boards to ISA
buss stuff. PCI risers might be the way to go since they are inexpensive ($15)
for 3 slot extenders. Also in an end product they fit into the L-brackets of a
computer case, or 2U mounts. They have assigned power buss we
can use, fairly inexpensive prototyping boards. ($50 - $60), are four layer and
designed to minimize intra trace noise. The buss wouldnt be used for PCI,
however it would allow power, (on designated standards based lines), intra
board connections, and FPGA, I2C,signals etc. PCI seems to be a little
large for what we are proposing, and the product boards would cost
more to produce, however, with an established buss we could put a radio on one
card, FPGA on another Audio on another etc. $15 Board amongst others:
http://www.plinkusa.net/riser.htm
Am I off the wall here?
That's the sort of thing I was thinking of doing. I used to
work for Racal and they used to build their military radios from separate
screened plug-in modules on a backplane.
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