Re: gEDA-user: new boards!
looks nice, DJ. I love that bankd of TO-220's. One modest comment - I see that you have a bunch of 'no connect'. Personally, I usually connect them to a small test node - surface mount node is ok. It does 2 things: gives you a place to solder to in the event that you later find out you need to; during any rework applying heat to those pads will quickly wipe them off the board. Yeah, it'll take up some routing space - but not too much. gene - Original Message - From: DJ Delorie Date: Thursday, March 1, 2007 12:22 am Subject: Re: gEDA-user: new boards! To: gEDA user mailing list DJ Delorie writes: http://www.delorie.com/house/furnace/pcb2/ I just finished populating the first board, which will be the debug board. The second one will end up in the furnace. Note that the furnace one will have the RJ45 jack transplanted to the bottom edge. The brass stencil thing worked well enough. There were only four bridges on the whole board, and only one of those was on the 0.5mm pitch connector, all easily fixed. I'm going to have to do something about the power supply, though - too much voltage being provided to the power module. I've sent email to the manufacturer asking for advice. Meanwhile, I haven't soldered those parts in yet. I'm going to hook up a generic 5v supply for testing, probably next week as we're going to visit my in-laws for a couple of days. DJ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user div ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
http://www.delorie.com/house/furnace/pcb2/ Those are some tall caps! Yeah. I originally had the M (miniature) series caps in there, limited to 470uF each, then I discovered these, which are 820uF each for the same footprint. The whole power supply uses only a 1/2 stripe on the board. Those are Panasonic EEU-FC1J821L caps. The brass stencil thing worked well enough. There were only four bridges on the whole board, Are you going to try tweaking the stencil? You could probably shrink problem openings with some solder. The openings for the 0.5mm pitch connecter were only 6mil already; my laser printer can't reliably print any smaller than that. The thing is, the brass is 5mil *thick* so by the time you etch all the way through, the etchant has had plenty of time to undercut the toner and do all sorts of weird things. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
Sorry if I missed this as part of the thread but once you did the brass stencil, what did you use to reflow the solder? Hotplate, toaster oven, air pencil? From: DJ Delorie [EMAIL PROTECTED] Reply-To: gEDA user mailing list geda-user@moria.seul.org To: gEDA user mailing list geda-user@moria.seul.org Subject: Re: gEDA-user: new boards! Date: 01 Mar 2007 00:13:31 -0500 DJ Delorie [EMAIL PROTECTED] writes: http://www.delorie.com/house/furnace/pcb2/ I just finished populating the first board, which will be the debug board. The second one will end up in the furnace. Note that the furnace one will have the RJ45 jack transplanted to the bottom edge. The brass stencil thing worked well enough. There were only four bridges on the whole board, and only one of those was on the 0.5mm pitch connector, all easily fixed. I'm going to have to do something about the power supply, though - too much voltage being provided to the power module. I've sent email to the manufacturer asking for advice. Meanwhile, I haven't soldered those parts in yet. I'm going to hook up a generic 5v supply for testing, probably next week as we're going to visit my in-laws for a couple of days. DJ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _ Win a Zunemake MSN® your homepage for your chance to win! http://homepage.msn.com/zune?icid=hmetagline ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
Sorry if I missed this as part of the thread but once you did the brass stencil, what did you use to reflow the solder? Hotplate, toaster oven, air pencil? http://www.delorie.com/pcb/hotplate/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
DJ Delorie [EMAIL PROTECTED] writes: http://www.delorie.com/house/furnace/pcb2/ I just finished populating the first board, which will be the debug board. The second one will end up in the furnace. Note that the furnace one will have the RJ45 jack transplanted to the bottom edge. The brass stencil thing worked well enough. There were only four bridges on the whole board, and only one of those was on the 0.5mm pitch connector, all easily fixed. I'm going to have to do something about the power supply, though - too much voltage being provided to the power module. I've sent email to the manufacturer asking for advice. Meanwhile, I haven't soldered those parts in yet. I'm going to hook up a generic 5v supply for testing, probably next week as we're going to visit my in-laws for a couple of days. DJ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: new boards!
Just showed up today... http://www.delorie.com/house/furnace/pcb2/ First observations: pcb-pool's drills (m32c board) were off center a bit, coming close to touching the edges of the copper. Advanced Circuit's drills seem to be much more accurately aligned. I put 1 2 3 4 on each layer, it turns out this makes it easy to verify the stackup (see photo), which is of course correct. As far as I can tell, all the thermals, teardrops, and clipped polygons turned out perfect. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
DJ Delorie wrote: Just showed up today... The teardrops look nice, DJ. What are the 3 long pads that appear next to some of the 20 pin and 32 pin footprints (on the top)? ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: new boards!
The teardrops look nice, DJ. Thanks! I've had traces detach from pins during rework, I'm hoping that the teardrops avoid the hard inside corners that sometimes lead to failure. Plus they're pretty :-) What are the 3 long pads that appear next to some of the 20 pin and 32 pin footprints (on the top)? 20MHz resonators for the five microcontrollers. Panasonic EFO-BM2005E5, about 72 cents each. Here's a photo on my r8c board: http://www.delorie.com/pcb/r8c-1b-adapter/bottom.jpg ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
