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Title: 1,5v 3v dc-dc (white led driver) Post by: gevv on February 12, 2008, 06:15:48 18:15 Used bobbin pc powersupply -12 or -5v filter
(http://img442.imageshack.us/img442/121/20146907wk8.jpg) (http://img106.imageshack.us/img106/5676/67443516hp3.th.jpg) (http://img106.imageshack.us/my.php?image=67443516hp3.jpg) (http://img106.imageshack.us/img106/9185/35999360rz8.th.jpg) (http://img106.imageshack.us/my.php?image=35999360rz8.jpg) (http://img215.imageshack.us/img215/6185/81406164nn2.jpg) (http://img442.imageshack.us/img442/7707/82374158lw5.jpg) (http://img106.imageshack.us/img106/7502/41891857qv0.jpg) Orjinal circuit belza.cz (http://www.belza.cz/ledlight/ledm.htm) Orjinal (http://img442.imageshack.us/img442/2339/11122393sk1.gif) my modification (http://img442.imageshack.us/img442/3339/49390735af5.gif) easy circuit schema (http://img508.imageshack.us/img508/5174/73081428vb0.png) Title: Re: 1,5v 3v dc-dc (white led driver) Post by: pasanlaksiri on June 20, 2008, 09:07:10 09:07 Woow LED is actually much brighter.
Title: Re: 1,5v 3v dc-dc (white led driver) Post by: Parmin on June 21, 2008, 01:28:16 01:28 I have been using this circuit from ELM at http://elm-chan.org (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. Title: Re: 1,5v 3v dc-dc (white led driver) Post by: hodahel 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?
Title: Re: 1,5v 3v dc-dc (white led driver) Post by: pasanlaksiri 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 (http://www.sonsivri.com/forum/index.php?topic=13570.new#new) Title: Re: 1,5v 3v dc-dc (white led driver) Post by: looser 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. Title: Re: 1,5v 3v dc-dc (white led driver) Post by: hodahel on July 12, 2008, 03:56:58 03:56 hmmmm...how can we boost it to about 5VDC?
Title: Re: 1,5v 3v dc-dc (white led driver) Post by: Parmin 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. |