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Another way cool way to run LEDs off of way dead batteries&nbsp;is by using a "joule thief":<BR>
<A href="http://www.evilmadscientist.com/article.php/joulethief">http://www.evilmadscientist.com/article.php/joulethief</A><BR>
(No need to&nbsp;buy any chips at all!&nbsp; Just a transistor, a resistor, and a coil.)<BR>
&nbsp;<BR>
Mitch.<BR>
&nbsp;<BR>
<BR>&nbsp;<BR>
&gt; From: jim@systemateka.com<BR>&gt; To: noisebridge-discuss@lists.noisebridge.net<BR>&gt; Date: Mon, 8 Nov 2010 17:27:36 -0800<BR>&gt; Subject: [Noisebridge-discuss] LED driver<BR>&gt; <BR>&gt; <BR>&gt; Great little article tells how to drive one or more LEDs <BR>&gt; from old, dying batteries: <BR>&gt; http://www.edn.com/article/510577-LED_flashlight_circuit_works_at_voltages_as_low_as_0_5V.php <BR>&gt; <BR>&gt; This is the chip that does it (LT1932): <BR>&gt; http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1061,P2114<BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; _______________________________________________<BR>&gt; Noisebridge-discuss mailing list<BR>&gt; Noisebridge-discuss@lists.noisebridge.net<BR>&gt; https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss<BR>                                               </body>
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