<p><img src="https://imgs.xkcd.com/comics/focus_knob.png" alt="Maybe if I spin it back and forth really fast I can do some kind of pulse-width modulation."></p>
<blockquote>
<p>"<a href="https://xkcd.com/1796/">Focus Knob</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>Maybe if I spin it back and forth really fast I can do some kind of pulse-width modulation.</p>

xkcd

Focus Knob


# XKCD

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