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A portable powered breadboard with a variable output 0.5v-9v (LM317).
It even has a meter.

<p>Just a note to let you know I have added this ( a year ago ) to the instructable:</p><p> Comprehensive Guide to Electronic Breadboards: A Meta Instructable</p><p>&gt;&gt; <a href="https://www.instructables.com/id/Comprehensive-Guide-to-Electronic-Breadboards-A-Me/" rel="nofollow"> https://www.instructables.com/id/Comprehensive-Gui...</a></p><p>Take a look at a bunch of ideas for using breadboards.</p>
i did something like this once nowhere near as good as this though
OMG&nbsp;Nice mess out there in the back :) Nice for testing low-power-consumption hardware. Maybe less tape will be better.&nbsp;

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