Yes I was aiming for some paste-pattern (not bigger blob). But if its KiCad limitation then you'll surely figure it out. Thanks for clarifying, sounds good

EDIT: So it seems the center hole per 4 asics will be acting as some sort of heatpipe to the heatsink itself (next to the heatsink sitting directly on the plastic caps).

The paste under the QFN would be a grid of nine square areas.

See http://www.ti.com/lit/an/sloa122/sloa122.pdf

http://www.actel.com/documents/QFN_AN.pdf <--- More QFN porn

http://www.youtube.com/watch?v=IhUGXEom6IM <--- Stencil Mate... hmmm might be interested if you are going to reflow yourself.

http://www.photostencil.com/pdf/Mastering-QFN-Challenges.pdf <--- Stencil for solder

http://www.solder.net/product <--- Website Order Stencils Here

http://www.pcb-devboards.de/catalog/product_info.php?cPath=66_71_75&products_id=10037 <--- Website Order Stencils Here

http://www.soldertools.net/product_images/PDFs/Reworking%20QFNs%20Newly%20Developed%20Cost%20Effective%20Approach.pdf <--- More info on QFN stencils and rework

http://www.soldertools.net/categories/Solder-Training-Kits/ <--- Need practice before the boards and chips arrive?

http://www.proto-advantage.com/store/product_info.php?products_id=2220077 <--- Buy Stencils

http://www.solder.net/products/stencilmate/evaluation-kit <-- Free Evaluation Kit for Stencil Mate.

http://www.proto-advantage.com/store/product_info.php?products_id=3000029{2}6 <------ QFN48 Stencil Kit

http://www.proto-advantage.com/store/datasheets/AN0001.pdf <---- Nice how to use of the Stencil Kit and equipment required.

http://hobbybotics.com/projects/hobbybotics-reflow-controller-v8-03/ <--- DIY Reflow Oven

Just asking... not sure if you have the time BKKcoins... just put it on the back burner if you get time later but can we get stencils for the solder mask for both the chips for bumping and for those who want to use masks on the PCBs one for a K16 board or just a a 4 chip quadrant.

Checking thickness of the solder info from a few pdf's on QFN 48 7 x 7 chips.



Can we get stencil templates?

1. For stenciling solder on the Avalon chips so we can bump the Avalon chip ourselves?
2. For stenciling solder to the entire K16 or one quadrant on the K16 (4 chip pads)?

Might be something that I can get fabricated in metal and if people are interested I can ship out once the boards are ready to be mass produced.

http://www.paceusa.com/sites/default/files/10072048.pdf

The PSU is arguably the best investment you can make. Don't cheap out. Well-regarded brands (Corsair, Antec, Enermax) are popular for a reason: they don't die under heavy loads. Most of these have multiple 12V rails you can use, rated to a certain current (say 18A). It'll be important to not overload individual rails.

The Lepa 1600-MA is $288 at Amazon. I bought one. Four 30A rails, two 20A rails, 1600 watts total. 20mV ripple on combined 12V rails under full load with 87% efficiency (according to one review). Yeah, she'll drive a lot of boards nicely

I've heard alot of talk of the K16 unit but what's the status on the K1 units now? How many do you plan on making? I just wanna have a slight idea on how much I should save of my BTC for a few units and how many other people I have to contend with as I'm sure there will be a good demand for the K1's.

I've got zero chips so far as I'm only interested in buying finished units and from what I read bkk is making the K1 units from his own chip stocks, I'd just like to know how many he's planning to make and an idea how much a finished unit would cost(Chip and all)

You would have to have your own chips for these boards or any boards he makes. He does not supply chips from what I have read through in this thread. His supply is limited and I believe was even considering taking Avalon chips from people in trade for boards. There are number of chip buys right now... or maybe wait for others to use his designs to make singles later might be possible.

Point is I think if you want K1's you need to give chips to BKKcoins so he could do them for you. We are a few months away I think from that so keep following the thread.

im also looking for a complete board , with everything included
but max $300 for every 5gh

I only have enough chips for my own boards, but I will have the facilities to place them on the boards for any one who wants to send them my way.

Actually I was not impressed with the video of the QFN being placed on the PS board in an earlier post. I don't think the guy doing the work was really happy with it either. While he got theleads to flow, the was no real effort to get the heat sink to flow. He played with the edges.