Step 5: Alerts !

User awareness may be the key to LiFePO4 AA cell uptake, as series dummy place holders must be specified with great certainty. With each LFP cell delivering 3.2V at high currents, yet in appearance similar (in AA form) to normal 1.2 -1.5V cells, particular care should be taken to avoid accidentally over supplying devices!  The likes of  6.4V (2 x 3.2V) in a digital camera designed for only 3V ( 2 x 1.5V) will almost certainly ruin it’s electronics…

The Feb. 2014 &quot;Silicon Chip&quot; monthly intends an article on this &quot;boxed&quot; approach, with a magnificent cartoon by <strong>Barney &quot;<em>Ohm-art</em>&quot; Walker</strong> to set the tone. When trimmed to a 20 x 10 hole array, Jaycar' s HP9588 board has shown itself very well suited for many breadboard developed circuits - PICAXE, 555, logic &amp; of course &quot;DANDY&quot; (Discretes Are Not Dead Yet).<br> <br> To help cash strapped hobbyists or schools who are unable to justify LiFePO4 cells, 4 x AA battery boxes can be converted. These allow 2 x normal 1.5V alkalines to be used.
<p>excellent write up on LifePO4.</p>
<p>Really great information and proof here!</p>
<p>A new board released by Australian firm Protostack seems <br> far superior to Jaycar's Paxolin versions. It's professional looking but <br>cheaper (Aust $2.90 ), in fibreglass, silk screened, and with PTH ( <br>plated thru' holes). </p><p>See =&gt; <a href="http://www.protostack.com/boards/prototyping/prototyping-board-small-style-1" rel="nofollow">www.protostack.com/boards/prototyping/prototyping-board-small-style-1</a></p>
<u>Update:</u> Further variations with 2 and 4 switched battery boxes have now been developed. An appealing feature of the 4 AA box is that 2 regular AA alkalines can be used (2 x 1.5 -3V) if LiFePO4 are unavailable. Some of the board slices used are fibreglass based KPB (Kiwi Patch Board), but this gets costly for small versions - it's wasteful to slice &amp; dice a nifty KPB for trivial needs!<br> <br> For skinflints &amp; schools I've hence also considered Australian/NZ firm Jaycar's (<a href="http://www.jaycar.com.au" rel="nofollow">www.jaycar.com.au)</a> HP9556 &amp; HP9558 (Paxolin) boards, which can yield up to 5-10 board &quot;fingers&quot; from a single ~$3-$5 purchase. When deeply scored on both sides they'll crack apart nicely, &amp; rough edges can be quickly sanded smooth. A quick spray of clear protective coating prevents track tarnishing &amp; aids soldering nicely.<br> <br> Sure - the resulting boxed board is not that profesional,but it's logical/neat/cheap/quick &amp; it's compact layout alerts assemblers to today's tight circuitry.
Jaycar, the popular Aus/NZ electronics outlet, now stock&nbsp; AA sized 14500 rechargeable Lithium cells. However they're in the Aust $10 range, and no simple USB smart chargers (nor dummy cells) are yet handled ...<br> 3.7V&nbsp; Li-ion&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =&nbsp; Jaycar code <strong>SB2303</strong><br> 3.2V&nbsp; LiFePO4 =&nbsp; Jaycar code <strong>SB2305 </strong><br> <br> LiFePO4 imports from China/Hong Kong are probably still possible at far lower prices, but Boeing's &quot;Dreamliner&quot; battery woes has meant that international air freighting of Li cells (especially Li-Po) has recently become &quot;difficult&quot;.
Modest blush -glad you liked it! If the hype pans out I see LiFePO4 cells/batteries being near revolutionary, &amp; AA sized ones being a great way to explore features.
Wow! When I first saw this 'ible (peppered with &quot;More Text To Come&quot;), I thought it was a pretty cool idea. Now that you have fleshed it out with (LOTS) more text and additional pictures, I really love it. Nice job.

About This Instructable




Bio: Retired educator/writer
More by manuka:Introducing LoRa™ ! Kid friendly bamboo geodesic dome LiFePO4 (3.2V) project, within a 3 x AA battery holder! 
Add instructable to: