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<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>One thing to try is
possibly just keeping the same PCB and breaking out the buck converter to a
separate board with the same footprint as the device from Akizuki. That way the
original design can be used unmodified since it’s known good and the buck
guts can be switched out based on what’s available/needed. I also think
that it would be an interesting twist to throw an AVR on the PCB and allow
people to add features via the Arduino environment. I’m pretty sure there
will be some pretty wacky and useful things added. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Also, within THS, we’re
using the 12V charger as one of the devices in a disaster management toolkit
that we’re trying to put together. It’s a basket of devices that
are ready to go for the next disaster/crisis that will occur somewhere. We’ve
noticed that many crisis situations share the same problems, mainly that access
to infrastructure (power, comms, water, etc) suddenly disappears. If we can
make more progress on this, then hopefully we’ll try to turn it into a
hackerspace-wide effort. It should be pretty interesting and a lot of the
discussions on stuff needed for hackupy are giving us ideas on other devices to
include. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Enclosures are essential
but I don’t think they need to be too fancy. They will probably need to
be somewhat moisture proof but also have access to open air in case its under
full load. Most of those requirements would need to come out from testing to
see what the enclosure air flow needed would be.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Akiba</span></font><font
color=blue><span lang=EN-US style='color:blue'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>FreakLabs Open Source
Wireless</span></font><font color=blue><span lang=EN-US style='color:blue'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Web: </span></font><font
color=blue><span lang=EN-US style='color:blue'><a
href="http://www.freaklabs.org"><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>http://www.freaklabs.org</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Shop:</span></font><font
color=blue><span lang=EN-US style='color:blue'><a
href="http://www.freaklabsstore.com"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>http://www.freaklabsstore.com</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Twitter: </span></font><font
color=blue><span lang=EN-US style='color:blue'><a
href="http://www.twitter.com/freaklabs"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>http://www.twitter.com/freaklabs</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt;color:blue'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
</div>
<div style='border:none;border-left:solid blue 1.5pt;padding:0mm 0mm 0mm 4.0pt'>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
miloh [mailto:froggytoad@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, December 06, 2011
2:40 AM<br>
<b><span style='font-weight:bold'>To:</span></b> akiba@freaklabs.org<br>
<b><span style='font-weight:bold'>Cc:</span></b>
hackupy-discuss@lists.hackerspaces.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Hackupy-discuss] USB
Chargers</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>On Mon, Dec 5, 2011 at 4:55 AM, Akiba <<a
href="mailto:akiba@freaklabs.org">akiba@freaklabs.org</a>> wrote:<o:p></o:p></span></font></p>
<div link=blue vlink=blue>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=blue face=Arial><span lang=EN-US style='font-size:10.0pt;
font-family:Arial;color:blue'>Sorry about the down time. Caught a nasty bout of
bronchitis for the past few weeks. </span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=blue face=Arial><span lang=EN-US style='font-size:10.0pt;
font-family:Arial;color:blue'>Regarding chargers, we (Tokyo Hackerspace) can
help acquire the DC/DC converters from Akizuki. The schematic should also be
modified so that the particular DC/DC converter is replaced with something more
readily available say from Digikey or via a DC/DC switcher and some discrete
parts. </span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=blue face=Arial><span lang=EN-US style='font-size:10.0pt;
font-family:Arial;color:blue'> </span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>Just getting over a bad case of drywall throat myself.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>Great, we will test these out and be in touch for more
Akizuki's if we want more!<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'>Just as an exercise
though, I'm curious about replacement parts for the Akizuki buck. I
haven't looked for other replacements, but I think the monolithic IC with a
heat sink solution should be targeted around $3 to match the Akizuki. Is this
unreasonable here? Any way to get the price to $3 for small orders the a
20W-30W buck + heat sink? Linear has nice parametric product finders <a
href="http://www.linear.com/products/step-down_(buck)_regulators"
target="_blank"><font color="#3333cc"><span style='color:#3333CC'>http://www.linear.com/products/step-down_(buck)_regulators</span></font></a> Maybe
this board as is could be used with breakout boards for parts easily sourced in
different areas of the world.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'>USB charge currents will
go higher than 1A for some devices, right? I know other folks are more
up-to-date on the issue of typical charge currents for usb connected devices,
but with 4 ports available on the board, perhaps we should look for something
with a 4A or greater supply capability. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'>What can we do to further
differentiate this from existing COTS hardware? Being kit based is great
in of itself, it gives folks something to spend some time learning about.
Having options for easily sourced cases (abs or pvc pipe), or unique and
personalized case (laser cut custom hacupyEnclosures ) is good also. Maybe the
road heads towards changing the pcb design in subsequent versions to include
atypical features like a uc+piezo alarm, exposed pcb for alligator clip
jumpers, or more... <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
</div>
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<p class=MsoNormal><span class=apple-style-span><font size=2 face=Arial><span
lang=EN-US style='font-size:11.0pt;font-family:Arial;background:white'>-rma</span></font></span><span
lang=EN-US> <o:p></o:p></span></p>
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