Date: Mon, 7 Nov 2016 22:52:46 +0100 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: USB-FPGA development On Mon, Nov 07, 2016 at 11:42:59PM +0300, Elijah SmarTeam wrote: > wide selection of "4.5 to 16v 5.5/2.1/positive center" I'm not sure if you realize, but obviously you should want to stay close to the upper end of the voltage range, to keep the current down. Since you don't want to get dangerously close to 16V (or you'd risk exceeding it), given what actual power adapters are widely available pretty much means 12V is the way to go. Besides, 12V is what those boards were most likely previously powered with (and thus tested with). That said, I just recalled that Butterfly Labs' Jalapeno Bitcoin ASICs shipped with 13V/6A adapters with the correct plugs. If you have, you should be able to reuse one of those as well. (I noticed this when retiring mine, but didn't try its adapter with a ZTEX board.) It will probably be very slightly more efficient (lower current, so lower loss in the cable). Alexander
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