SugarAddict 227 Posted June 18, 2011 Share Posted June 18, 2011 So this is mostly for RobG since he inspired it... I'm open to some suggestions for improvements/changes. I plan on ordering this next week as I have 2 chips for it.. third will get mailed to RobG if he drops me his address :-P Fits on top/botttom of the launchpad, has rows for headers or wire connections, and leaves room for through hole additions. Takes positive center warts at varying voltages and converts them down, will take a crystal and 47k resistor on Reset, has a 4pin header for programming... http://www.bluedragonfire.com/ee/Layouts/G2XX3-28-ShieldPwr.brd *The footprint for the LM317MDCY (TI chip) is not proven as I just made it. Should be damn close with extra tab copper. RobG 1 Quote Link to post Share on other sites
bluehash 1,581 Posted June 18, 2011 Share Posted June 18, 2011 Looks good. Where are you ordering it from? If its below 5x5cm, seeed studio does it for $10 for 10 pcbs Quote Link to post Share on other sites
SugarAddict 227 Posted June 18, 2011 Author Share Posted June 18, 2011 It's 1.906inches... 4.846cm... I haven't used SeeedStudio for boards... might give it a shot. Quote Link to post Share on other sites
RobG 1,892 Posted June 18, 2011 Share Posted June 18, 2011 I'll take it! BTW, this gives me an idea. If we can come up with some cool boards and produce them at 10/$10, a set of boards would make a great prize for the POTM. I am willing to donate 10 boards (serial LCD backpack) once I make them. Quote Link to post Share on other sites
Mac 67 Posted June 18, 2011 Share Posted June 18, 2011 It looks very nice but shouldn't you use 45 Quote Link to post Share on other sites
SugarAddict 227 Posted June 18, 2011 Author Share Posted June 18, 2011 http://www.bluedragonfire.com/ee/Layouts/G2XX3-28-ShieldPwr-2.brd Ok, I think I got them all. Had to find out why no 90 Quote Link to post Share on other sites
hvontres 22 Posted June 18, 2011 Share Posted June 18, 2011 I'd be interested in two of them for my own use. Quote Link to post Share on other sites
timotet 44 Posted June 18, 2011 Share Posted June 18, 2011 This looks great. nice work! Quote Link to post Share on other sites
SugarAddict 227 Posted June 21, 2011 Author Share Posted June 21, 2011 Order placed at SeeedStudio. We'll see how it goes when they get here. Quote Link to post Share on other sites
GeekDoc 226 Posted June 22, 2011 Share Posted June 22, 2011 Had to find out why no 90 Quote Link to post Share on other sites
gordon 229 Posted June 22, 2011 Share Posted June 22, 2011 The etchant gets under the sharp corners easier and causes bad etching. I don't really think it is a(ny major) problem with professionally-made PCBs, but it is an issue when you cook Fe2O3 my buttFeCl3 in the kitchen, so I'm guessing in this particular case bringing up the right angles-issue might be just an involuntary reflex . GeekDoc 1 Quote Link to post Share on other sites
GeekDoc 226 Posted June 22, 2011 Share Posted June 22, 2011 The etchant gets under the sharp corners easier and causes bad etching. Ah, I can see how that would happen. Luckily, Dorkbot-PDX's board house puts out great quality. I'm anxious to see the Seed Studio board quality (nice price!). Quote Link to post Share on other sites
zeke 693 Posted June 22, 2011 Share Posted June 22, 2011 The other reason for using 45' angles on traces has to do with high speed signals. By high speed I mean really high speed. So high, we will never see them on a LaunchPad board. Still, it's good practice to use 45' angles on pcb traces. Dave Jones' PCB Design Tutorial has some high speed pcb layout guidance on page 19. The whole document is an awesome resource. gordon 1 Quote Link to post Share on other sites
juani_c 66 Posted June 22, 2011 Share Posted June 22, 2011 The etchant gets under the sharp corners easier and causes bad etching. I thought it was for an electric-related issue. maybe electrons don't know how to turn sharp corners... Here it is an explanation I've found(it comes from TI)->http://focus.ti.com/lit/an/slod006b/slod006b.pdf look at "17.4.4.1.2 Trace Reflections" Quote Link to post Share on other sites
SugarAddict 227 Posted July 10, 2011 Author Share Posted July 10, 2011 So here are the first 30 minutes of me having the boards... which look pretty darn awesome to me so far! The slower turnaround wasn't too bad, the quality seems to be pretty good so far (testing needed), and the price is pretty darn good! I will probably use them for larger designs... I've got a few already, muahaha. Rickta59 1 Quote Link to post Share on other sites
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