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Joule Thief Circuit LED Blinks

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With the "Joule Thief" circuit running, I noticed that when the battery gets low, the led will start to blink. If a meter monitors the voltage of the battery, you can see the voltage come back up after the led goes out.
The background sound is my Windharp that plays on Internet Radio 24/7 at http://windharp.webhop.net
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