My DIY Avalon-based mining board (Davalon)

[evilscoop]

I'm interested in this. Right now there are only two real options when it comes to Avalon PCB designs. If we can get some of the demand for miners spread across more designs, we will all probably have fewer problems with deployment when the chips finally ship en masse.

3 actually not including this one :p

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[danattacker]

Board design is pretty much finished. Check OP for details.

[ryepdx]

Very nice! Can your board handle overclocking?

[danattacker]

Very nice! Can your board handle overclocking?

Overclocking is done by the firmware. If you mean to ask if my board can handle additional power load and heat from overclocking, that is yet to be seen.

[ryepdx]

If you mean to ask if my board can handle additional power load and heat from overclocking, that is yet to be seen.

Do you know how much overhead your components have...?

[danattacker]

If you mean to ask if my board can handle additional power load and heat from overclocking, that is yet to be seen.

Do you know how much overhead your components have...?

The regulator module I'm using is 20A. Assuming that each chip uses 2 watts, that is ~16.7A under normal operation. So, I have ~3.3 more amps to work with.

[dropt]

If you mean to ask if my board can handle additional power load and heat from overclocking, that is yet to be seen.

Do you know how much overhead your components have...?

The regulator module I'm using is 20A. Assuming that each chip uses 2 watts, that is ~16.7A under normal operation. So, I have ~3.3 more amps to work with.

Is there a reason you're using a 20A regulator vs something bigger?

[fasmax]

How does heat get from bottom of the ASIC chip to the heatsink?

[dentldir]

Good stuff man. 

Do any of the online PCB places sell short runs of custom boards that others have designed?  I've seen sites like 4pcb.com and pad2pad.com, but they seem to only make boards if you design it in their software.

[danattacker]

Is there a reason you're using a 20A regulator vs something bigger?

I'm just using the cheapest 20A regulator module on DigiKey.

How does heat get from bottom of the ASIC chip to the heatsink?

There is a 5x5 array of thermal vias of 0.3 mm hole diameter on each chip. You can't see them in the image because the image is taken directly from the gerber files which don't show the holes.

Good stuff man. 

Do any of the online PCB places sell short runs of custom boards that others have designed?  I've seen sites like 4pcb.com and pad2pad.com, but they seem to only make boards if you design it in their software.

I know of iteadstudio and seeedstudio.

[ProfMac]

Good stuff man. 

Do any of the online PCB places sell short runs of custom boards that others have designed?  I've seen sites like 4pcb.com and pad2pad.com, but they seem to only make boards if you design it in their software.

Olimex will, if the original designer gives them a permission letter.
I have not checked lately what the limits of their trace size are.  A few years ago, I think 8 mil was their limit.