[Noisebridge-discuss] LED driver

[Mario Landau Holdsworth]

Thanks so much for sharing! I think I will try the joule thief at Mission
Science! What a great use of "dead" batteries!.
-Mario

On Tue, Nov 9, 2010 at 4:48 PM, Michael Shiloh
<michaelshiloh1010 at gmail.com>wrote:

> 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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