[Noisebridge-discuss] LED driver
Michael Shiloh
michaelshiloh1010 at gmail.com
Wed Nov 10 00:48:08 UTC 2010
i've made joule thiefs with kids. the circuit is incredibly tolerant of
the quality and number of windings on the transformer, and makes for a
great activity.
a dab of hot glue to hold the wires in place before the kids start to
wind is a great help.
kids love the idea of a flashlight that runs off dead batteries.
On 11/08/2010 05:47 PM, Mitch Altman wrote:
> Another way cool way to run LEDs off of way dead batteries is by using a
> "joule thief":
> http://www.evilmadscientist.com/article.php/joulethief
> (No need to buy any chips at all! Just a transistor, a resistor, and a
> coil.)
>
> Mitch.
>
>
>
> > From: jim at systemateka.com
> > To: noisebridge-discuss at lists.noisebridge.net
> > Date: Mon, 8 Nov 2010 17:27:36 -0800
> > Subject: [Noisebridge-discuss] LED driver
> >
> >
> > Great little article tells how to drive one or more LEDs
> > from old, dying batteries:
> >
> http://www.edn.com/article/510577-LED_flashlight_circuit_works_at_voltages_as_low_as_0_5V.php
>
> >
> > This is the chip that does it (LT1932):
> >
> http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1061,P2114
> >
> >
> >
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>
>
>
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--
Michael Shiloh
KA6RCQ
www.teachmetomake.com
teachmetomake.wordpress.com
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