From: Jim Brain (brain_at_jbrain.com)
Date: 2005-07-07 16:11:21
I'd appreciate any feedback on the newest PCB design. The design also has the advantage of bringing out all of the ATMEGA128 IO lines to headers, so the board can be used as a general purpose prototype board if needed. I placed pics of the v2r2 board on the web site: http://www.jbrain.com/vicug/gallery/uIEC/ Changes since r1: As noted, I used a TSOP package for SRAM, which is hard to solder by hand. r2 has a SOJ32/4, which should be very doable by hobbyists. Changed to the final CF connector Unfortunately, this connector (and the others I found) are longer than the test one I was using, so the board expanded to 2.5" by 3". It still looks to fit in the DTV, though :-) Numerous touchups to minimize wire length, make sure ground plane coverage was good, and minimize number of vias. Added 2 pins to IO connector. Flipped LEDs and resistor locations in schematic, so resistor is after LED. That way, you can ditch the LED and grab the actual LED signal from the LED pin. Had to move the IDE connector another .1" away from the PARALLEL connector. Test fittings showed .2" is not enough spacing. .3" is good enough, though still tight. Moved both LEDs to one side. Made the CF connector overhang the board .1". Thus, if you butt the PCB up to a plastic case, the CF connector will just peek through the opening. Prepped labels for silkscreening. Jim -- Jim Brain, Brain Innovations email@example.com http://www.jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Message was sent through the cbm-hackers mailing list
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