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#1
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Hey Glenn.
Thanks for the info. I do have one design I need quoted right now. I'll email him and see what prices he gives me. I know I asked them for a quote just about a month ago and they were a bit higher. Think James had the same experience too. Maybe it's just the little panel stuff they have the best price with. Hard to say as it seems some guys specialize in one thing, yet others give better prices on something else. I'll post the prices here and let you know who I went with. |
#2
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Quote:
Hmm actually for 1 panel GP is cheaper but @ 2 panels QualityPCB does come in %25 cheaper .. I will certainly get them to quote for me next time. Thanks for the pointer Henry Last edited by rgjones; 04-19-2008 at 02:45 PM. |
#3
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The board I made was just a quick and dirty 30x2 .6" wide DIP adaptor.
The trace/space was 5mil. At 6.25mil it would end with 28 traces unrouted, 5 mil would route almost immediately. The board was 4 layer as shown. The price penalty of using PSRAM might not be worth it. SDRAM would be harder, but pay for itself in the end. A lot of the commercial designs out there are able to use 6 layers on small embedded boards. |
#4
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Humm.... I would tend to agree from what I'm seeing in the prices. Not that anything HAS to be this PSRAMs of course.
Now back to square one. Anyone have a high density SDRAM IC in mind? TTSOP I would assume? I bet we can even find a stock Adapter too then. |
#5
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Why would we need an adapter for a TSSOP?
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#6
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A 'stock' adapter for proto typing. Why produce custom PCBs until we get a known working unit? A simple SOIC to DIP adapter is all that's needed to work on a bread board for instance and MUCH cheaper.
Maybe even a PLCC to DIP adapter also for the CPLD. Then all custom surface mount for the production PCB. |
#7
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I guess I was thinking we'd use a TFQP CPLD...
I guess I have a different opinion, since 3 overtime hours would pay for the prototype and I couldn't wire a bread board in 3 hours. |
#8
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Ok, back to the Forums.
Glenn: Did you ever pricing on this design: http://www.a2retrosystems.com/images...t/breakout.png PS - Can you make that pic a little larger? ;-) What I may be able to do is if you send me the GERBER files I can 'clean' them up and get some pricing from different places. Am I wrong to think that that is still a two layer PCB? I think I will be able to mount the IC to the PCB. Doing to quick tests with a BGA IC I was able to fully mount it to a piece of sheet copper. Of course I destroyed the IC when I removed it. But the balls all looked like the adhered to the copper very well. Only testing would tell if I baked the IC though. And no PCB, no testing. Assuming Andon Electronics Corp can produce the Adapters for 16.85ea and it's not some screw up on their side with pricing, which actually I assume it is, then they may be the cheapest solution. If we can get some proto PCBs produced for less then I say we do that, just for testing. At least I will know for sure if I can mount BGAs without damaging the IC. Also the benefit of the PSRAM would really make the added hassle worth it. I also have a call in to Andon Electronics Corp to check the pricing. [From Glenn's Quote email] well certainly better then my first quote for mounting services ... but still .... sheesh - $ 150 to mount one chip - crazy Very true. That is just nuts. Anyone having a PCB produced any time soon? Maybe you could add a quick little VFBGA pad area to the PCB that could be cut off so I can experiment with mounting the IC. Just vias would be fine, if possible. [GRANT] You guys are still interested in the BGA? I thought that we decided to give up??? I wouldn't say 'give up' entirely. But more keep the options open and see what comes of it. I think we all agree that the PSRAM will be much simpler to work with then a piece of SDRAM. The only disadvantage of the PSRAM is the uncertainty of mounting it. [GRANT] I just made a design in Xlinix ISE 8.2 using schematic entry. It works great. There are a few bugs with the schematic entry, but once you learn where NOT to click it works good. Oh great! It's Win CUPAL all over again?!? I did do a little playing around with 8.2 and the Schematic Entry too. Seems like it would be a bit easier then using HDL entry, at least for me and my needs. Last I heard though they are doing away with Schematic Entry in the next version. May just be rumor though. [GRANT] RamWall Invaders! It will be real! Only you Grant. ;-) Oh, one last question: Anyone know were we can get pins? Like those used on the Adapters as legs? No top, just a flat surface for PCB pad mounting? I asked a few places if they would just sell me legs (pins) but they won't. If we make our own adapters, our only other choice are SIP sockets, like I use on my Dual Adapters, or square pins. Any other ideas or options? Last edited by Reactive; 04-29-2008 at 05:43 PM. |
#9
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Tried to upload a .PDF. Says "Your file of 56.1 KB bytes exceeds the forum's limit of 19.5 KB for this filetype."
Boo! Hiss! I'll email it then. :-( |
#10
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Quote:
1) pad size is 36mil - needs to be 30mil 2) both vcc and gnd traces would not route for some reason so I have to do that manual 3) some of the traces are mixed up as I botched the order and have not gone back and fix it up yet 4) traces are 5mil and clearance was set at 4 mil So GP pricing would be 99+80/38 = $4.75 a piece Didn't want you guys to miss anything Quote:
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Last edited by rgjones; 04-30-2008 at 01:12 AM. |
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