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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > 1,5v 3v dc-dc (white led driver)
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gevv
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« on: February 12, 2008, 06:15:48 18:15 »
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, 09:07:10 09:07 »
Woow LED is actually much brighter.
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Parmin
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« Reply #2 on: June 21, 2008, 01:28:16 01:28 »
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 21, 2008, 04:32:55 04:32 »
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, 10:00:21 22:00 »
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, 11:05:27 11:05 »
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 12, 2008, 03:56:58 03:56 »
hmmmm...how can we boost it to about 5VDC?
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Parmin
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« Reply #7 on: July 14, 2008, 12:10:55 00:10 »
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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