[Noisebridge-discuss] LED driver

[Michael Shiloh]

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