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Author Topic: 1,5v 3v dc-dc (white led driver)  (Read 15308 times)
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gevv
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« on: February 12, 2008, 12:15:48 12:15 »

Used bobbin pc powersupply -12 or -5v filter













Orjinal circuit belza.cz

Orjinal



my modification



easy circuit schema



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pasanlaksiri
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« Reply #1 on: June 20, 2008, 03:07:10 03:07 »

Woow LED is actually much brighter.
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Parmin
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« Reply #2 on: June 20, 2008, 07:28:16 19:28 »

I have been using this circuit from ELM at http://elm-chan.org



The great thing is it is self regulating so you could use up to 3 LED in series and it still works great.
I wound the transformer on little bobbin toroid.

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hodahel
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« Reply #3 on: June 20, 2008, 10:32:55 22:32 »

quite interesting...i think same circuit to charge a cellphone using a single 1.5 battery?

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pasanlaksiri
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« Reply #4 on: June 21, 2008, 04:00:21 16:00 »

Its actually super bright. I just make it.

Look here http://www.sonsivri.com/forum/index.php?topic=13570.new#new
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looser
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« Reply #5 on: July 05, 2008, 05:05:27 05:05 »

hodahel

you are right. It is the circuit for charging the cellphone batteries. Except the coil; is standart 100uH quarter watt resistor package.
Brightness might be becouse of the roll coil used here.

Regards.
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« Reply #6 on: July 11, 2008, 09:56:58 21:56 »

hmmmm...how can we boost it to about 5VDC?
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Parmin
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« Reply #7 on: July 13, 2008, 06:10:55 18:10 »

its already more than 5v, because to charge cell phone you need at least 5V.
OTOH, you may not get lots of current on these arrangements, so it takes either a hell lot of time or just barely enough to trickle charge.
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