gEDA-user: Need help finding Conexant CX25874-24 (TV chip)
We've got OGD1 boards at the assembly house, and we've run into a supply problem. The Conexant CX25874-24, the TV output chip we selected, has reached end-of-life, and we're having trouble finding a broker who will supply them at a reasonable price. For instance, one broker we contacted hasn't even responded to our inquiries. So, we're asking for help on this one. We need to find the best price on 25 to 30 of these chips. Our original quote (which we had factored into the budget) was $9.68 each. We should also discuss the option of skipping this altogether, which would save us time and money. Plus, if the best price is too high, we'll skip it anyhow. We can come up with a clever FPGA solution that involves using the VGA DAC to generate s-video. The Conexant CX25874-24 is in a 64-pin TQFP package. P.S. I wanted to be sure to thank those of you who helped with my previous question regarding the fried FPGA dev board. We're in the process or locating replacements for the capacitor, diode, and the voltage regulators. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Need help finding Conexant CX25874-24 (TV chip)
We now have multiple quotes, so we're all set. Thanks to those who responded. On Tue, Mar 23, 2010 at 10:33 AM, Timothy Normand Miller theo...@gmail.com wrote: We've got OGD1 boards at the assembly house, and we've run into a supply problem. The Conexant CX25874-24, the TV output chip we selected, has reached end-of-life, and we're having trouble finding a broker who will supply them at a reasonable price. For instance, one broker we contacted hasn't even responded to our inquiries. So, we're asking for help on this one. We need to find the best price on 25 to 30 of these chips. Our original quote (which we had factored into the budget) was $9.68 each. We should also discuss the option of skipping this altogether, which would save us time and money. Plus, if the best price is too high, we'll skip it anyhow. We can come up with a clever FPGA solution that involves using the VGA DAC to generate s-video. The Conexant CX25874-24 is in a 64-pin TQFP package. P.S. I wanted to be sure to thank those of you who helped with my previous question regarding the fried FPGA dev board. We're in the process or locating replacements for the capacitor, diode, and the voltage regulators. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Need help repairing a damaged FPGA board (GR-PCI-XC2V)
A relatively new professor here at OSU had one of these FPGA boards: http://www.pender.ch/docs/GR-PCI-XC2V_product_sheet.pdf Unfortunately, some students recently fried part of the power regulation circuit. We don't have the expertise to repair it ourselves, and we don't have the budget to buy something new. This board was being shared by multiple students, one of whom was using it for his masters thesis work. So its loss is rather painful and problematic. I was wondering if anyone could advise us on repairing this. Perhaps there is someone whom we could ask to repair it for us? Trying to get the original manufacturer to repair it would probably cost more than it's worth. The damage was done to at least the C12 and D9 components (lower left in the picture). Any suggestions and help would be most appreciated! -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Recommendations for laptop?
on it, and it will work fine, although you may have some challenges with the wireless. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Pay someone to do PCB work for me?
On Tue, Jun 3, 2008 at 9:47 AM, Kai-Martin Knaak [EMAIL PROTECTED] wrote: On Mon, 02 Jun 2008 10:36:01 -0400, Timothy Normand Miller wrote: Is it okay to ask on this list to hire someone to do a PCB design? It is ok. IMHO, it is still ok, if the resulting design design were closed source. That said, I definitively appreaciate the free as in freedom approach. Probably no more than 4 layers, and a relatively simple design. Can you be a little bit more specific? How many components? Any special, non standard footprints? What size? Digital, or analog? How much power? What frequencies are involved? (...) Mostly just a SoC, some power supplies, headers, and other connectors. However, one of our guys wants to integrate resistors and small caps into the PCB, because it's cheaper in large volume. I understand that the free tools can't do that, at least not directly. Is there an indirect way to do it? By and large, this should be a simple board, except for certain issues like that. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Pay someone to do PCB work for me?
On Tue, Jun 3, 2008 at 10:19 AM, John Luciani [EMAIL PROTECTED] wrote: I am assuming you want low values of resistance and capacitance. What kind of tolerances do you require? For a cap you could create a footprint with parallel pads on the component and solder sides. For resistances create a footprint consisting of a series of overlapping pads. Can you _control_ those values? I'm assuming the typical process involves specifying a value, and there's a way to make the board to spec. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Pay someone to do PCB work for me?
Is it okay to ask on this list to hire someone to do a PCB design? Some friends and I have a little project we're working on and some money to hire someone to do the PCB. We just don't have someone to do the board. Probably no more than 4 layers, and a relatively simple design. Also, we intend to release the schematics and artwork under liberal licenses. Thanks. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Problem with OGD1: Can anyone advise on good low-jitter
BTW, I just wanted to thank everyone for the help with the clock generation problem. Lots of useful information! ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Problem with OGD1: Can anyone advise on good low-jitter
Sorry about the cross-post. We're -- THIS close to getting OGD1 done, with artwork in the hands of board makers who are working on quotes, and we've discovered a problem that could make the video output unacceptable. We've discovered that the clock generators in the Xilinx FPGA part are lousy for generating video clocks. We're seeing like 900ps of jitter, which causes artifacts on DVI monitors at resolutions as low as 1280x1024 when the cable gets beyond a certain length. (I don't recall all the details.) One option is to use the clock generators in the Lattice part, but even they have like 400ps of jitter, and they also severely limit the range of frequencies we can generate. So the best solution we can come up with is to put on some external clock generators. One for each video head. Problems: (1) more time to mod the design, (2) up to $15 each for the generators, (3) we have no idea what generators to use, how good they are, how to wire them. Does anyone know anything about these? Do you have experience with specific high-frequency clock generators and know how they perform and what kind of jitter they produce? Unfortunately, it could take quite a long time for us to find suppliers of clock generators, get samples, wire them up and test them, etc., so we just need find out if someone out there already has the right answer or knows where to look for it. Thank you for your time! -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Forwarding?
Does this list forward automatically to gEDA-dev? -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Forwarding?
On 11/28/07, Peter Clifton [EMAIL PROTECTED] wrote: On Wed, 2007-11-28 at 14:21 -0500, Timothy Normand Miller wrote: Does this list forward automatically to gEDA-dev? No, although most of the geda-dev subscribers will probably be subscribed to geda-user. Ok. Because when I posted to both gEDA-dev and gEDA-user, I got back THREE emails, one of which had both gEDA-dev and gEDA-user prepended to the subject. Odd. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: C++ (was Re: interesting links)
On 8/30/07, Dave McGuire [EMAIL PROTECTED] wrote: On Aug 30, 2007, at 9:26 PM, Timothy Normand Miller wrote: I'm no longer obsessed with maximizing performance of the machine. Now, I want to maximize my performance as a programmer. Be very, very careful with that attitude. Back in the 1970s, some blithering idiot came up with the idea that programmer time is more important than processor time. This has given rise to things like Windows, which takes hundreds of megabytes of RAM and multi-GHz processors to do even the very simplest of things. That moron back in the 1970s (whoever it was) should be put up against a wall and shot. Well, don't misinterpret me. I still like to write tight, efficient code. And in fact, Ruby makes that easier, I believe. If you were to rewrite that same code in C++, it would be faster and not require the Ruby runtime environment. But it would take a heck of a lot longer to code and be much more difficult to modify. (Or course, if everything were writtn in Ruby, the VM memory overhead would amortize out.) I took a computational linguistics class last Spring quarter, and I decided to do the class project (an Earley parser) in Ruby. A direct port of the Java program to Ruby was remarkably slower. However a bit of profiling and some other clever optimizations later (not all mine--another student was using Ruby too and shared some ideas), and I was beating the best time of any Java program by an order of magnitude. Ok, so sure, I spent extra time working on it, but that's okay, because it was FUN. :) The lesson: Profilers are your friends. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: OFF TOPIC: Tech Source job openings
Well, I wanted to make sure I didn't get any objections. I got two people telling me it's okay and no other responses, so I'm going to assume it's okay. Since posting job openings is bad form anyhow, instead of pasting them into the email, I've put them onto this web page: http://www.traversaltech.com/files/tsijobs.htm Thank you very much for letting me post these, and please pardon the intrusion. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-dev mailing list [EMAIL PROTECTED] http://www.seul.org/cgi-bin/mailman/listinfo/geda-dev -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: C++ (was Re: interesting links)
On 8/30/07, Randall Nortman [EMAIL PROTECTED] wrote: It was right around 1999/2000 (when I was also enthralled with CORBA and all the wonderful things it was going to do for the world) that I finally got seriously fed up with C++. It is a complex, non-sensical, You and I have seem to have a similar history here. I read like 7 books cover to cover and became an expert on C++. I guess I took a little longer than you to get fed up with it, though. My C++ usage really came to an end when I started using Ruby. SOOO much easier and more consistent. User friendly. Now, I use Ruby for everything, except GUIs, where I use Java. For school, I'm using Ruby for genetic algorithms. When I desperately need performance, I write a C extension for Ruby. I'm no longer obsessed with maximizing performance of the machine. Now, I want to maximize my performance as a programmer. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Off Topic: Permission to post job openings?
I've been on the geda-dev mailing list for some time. Some months back, I asked them if it would be okay for me to post some engineering job openings that I thought would be relevant to some of the list members. They were very gracious and allowed me to do so. At least one of the members there suggested that people on THIS list might be even more interested. So I thought I would ask for permission to post here too. If you feel that this is an intrusion, feel free to tell me to take a flying leap, and I'll apologetically go away with my head hung in shame. Thank you for your time. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
