Instructables

Smallest LED flashlight

Picture of Smallest LED flashlight
This is one of the smallest flashlight that you can make.
you dont need special tools, casing,switch,etc.
its simple and quick project that you can make just following this steps :D
 
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Step 1: Parts

Picture of Parts
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You will need :
1x LED ( any color,white is brightest)
1x cr2032 battery ( 3v battery, button cell)
some glue from glue gun
lighter
scalpel

Step 3: Finish

when you finish this just bent cathode back.
when you want to use it just push cathode to - end of battery and light comes....

one note, my LED is glowing ok but battery is half discharged ( i scrap 50 batterys from old motherboards so half of them are discharged and half is around 2.8 v )
this flashlight can work as mouch as led throwie (1-2 weeks constant, or on daily use from bed to bathroom = 1 year)
BOOM OWWWW7 months ago
I have a 9.6v battery and want to make a detonator but don't know what resistors to use for the LEDs?
BOOM OWWWW7 months ago
Howe much do u need to make a wire glow to set off fireworks?
tealk (author)  BOOM OWWWW7 months ago
i dont know. but here is full list of nice projects for firework igniter

http://www.instructables.com/tag/type-id/?sort=none&q=FIREWORK+IGNITER
tealk (author) 7 months ago
you will need 2 aa batterys because resistance of 50ft 12 gauge wire is only 0.08 ohms
BOOM OWWWW7 months ago
How many AA battery's do u need to power through 50 ft of wire
BOOM OWWWW7 months ago
Ok
BOOM OWWWW7 months ago
How do I hook a LED up to a 9 v battery with out burning it out?
tealk (author)  BOOM OWWWW7 months ago
you need 330 ohm resistor to connect on + end of battery

this is calculator http://led.linear1.org/1led.wiz
BOOM OWWWW7 months ago
I Reilly like it
tealk (author)  BOOM OWWWW7 months ago
thanks
longwinters7 months ago
Sorry to bust yer bubble but the led's that back light cell phones are smaller than a pin head, the only problem is hooking them up without breathing because a puff of air blows them away.
A hearing aid battery and an led would fit easily in half a sugar cube
tealk (author)  longwinters7 months ago
oh man, i said its one of the smallest flashlights not the smallest flashlight.
Also i could trim anode and cathode and use smaller battery, and instead of 5mm LEd i could use 3mm led .......you could make smaller then this but not easy as i did.....thank you for comment
MrE7 months ago
Please submit a new twist for this as all this is, is an led throwie, which has already been shown here.
tealk (author)  MrE7 months ago
it isnt LED throwie. led throwie is LED atached to battery and its turned on all the time...
my instructable is about LED whose anode is attached to baterry and cathode is free, so when you push cathode to battery (negative end of battery) it turns on.
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