The Hummingbird Clock: date videos by background mains hum
I&#x27;m surprised when it says &quot;the exact same buzz can be heard at the exact same moment nationwide from Land&#x27;s End to John o&#x27; Groats&quot;, I didn&#x27;t realise it would be the same across the UK.<p>I played a little with a transformer to take 230VAC -&gt; 12VAC, and then using a potentiometer to feed the waveform into a soundcard.  But I&#x27;m not sure the sample rate of the soundcard was high enough to accurately measure the times between 0 crossings.<p>Photo of the very messy setup - <a href="https:&#x2F;&#x2F;www.anfractuosity.com&#x2F;files&#x2F;hum.jpg" rel="nofollow">https:&#x2F;&#x2F;www.anfractuosity.com&#x2F;files&#x2F;hum.jpg</a>