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Date: Mon, 7 Nov 2016 21:59:05 +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:
> Slight off-topic - how do you power those 1.15y? From site I'm getting too
> wide selection of "4.5 to 16v 5.5/2.1/positive center" (
> http://wiki.ztex.de/doku.php?id=en:ztex_boards:ztex_fpga_boards:power_supply_selection).
> But what about amps? As I have only one of those - don't want to burn it :)
> Maybe some well-known replacement option exist for power supply unit? (from
> some routers or other consumer grade devices)

This would be on-topic on the john-users list.

You can use an ATX power supply.  You can also use a power adapter as
you described above.  I tried a 12V/5A and it was getting too hot to the
touch (even though the actual load current was well under 4A).  I later
bought some 12V/6A adapters and used those - much cooler.  All of them
were cheap ones (about $12) off eBay.  Maybe a higher quality 12V/5A
would not get as hot.

Do not use laptop power adapters.  They usually have the same plugs and
polarity, but deliver 19V.  ZTEX boards have 16V Zener diodes parallel
to input to prevent overvoltage like this, but you probably don't want
to test and see what burns first and in what exact way. ;-)

Alexander

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