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    efficient 12v to 5v regulator chip.

    hello all, i need 5v supply from my vehicle 12v battery.i know i can use 7805 but the problem is my circuit drives 20 LEDs continuously which roughly needs more than 400ma of current(over all).and the area is so conjusted i can't mount a big heat sink. so can i use dc-dc converter for this...
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    chat-cord--> connect ur phone to PC

    hi all i have been working on this project from 2 weeks.it worked nice. it is really worth making circuit. there 2 types of circuit. 1.it uses 600:600 center tapped transformer   http://www.grynx.com/projects/build-your-own-chat-cord/1/ 2.this uses combination of resistors and capacitors...
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    charger for Cordless phone battery.

    hi all iam working on a school LED project.where we need to use a 3.6v 300ma battery(one used in cardless phones).u know cordless phone chargers are dumb type.can u suggest me some good charger for this battery pack. i don't want  hi-fi type of charger.just simple one which makes the battery...
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