led drive made from discreet components ?

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hi,  i want to make a led torch , something simple , that runs of 2  , maybe
4      ,  1.5 volt battteries .
and  to power   2 or 4  white leds.

 is there a driver to make  bit more efficent use of battery and leds ?
something that uses transistors  etc , NOT  ic`s.

   thanks,
mark k



Re: led drive made from discreet components ?


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Have a look at the range of LEDs and driver boards at  Dealextreme.com,
you might get some ideas, but you may find pre-built stuff cheaper and
easier than making something yourself. LEDs really only need resistor
current limiting which often turns out more efficient than PWM.

Re: led drive made from discreet components ?



"mark krawczuk"


** A wise designer always specifies components that can be trusted to be "
discreet " .

 Imprudent or exuberant types will never do.




......    Phil





Re: led drive made from discreet components ?



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Efficent with transistors not in IC's ?  ha ha ha har good one.
You can get dc-dc converts that will be over 95% but they are IC.



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