how-to-hack-and-old-flashlight-into-an-led-one.pdf

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How to mod and old flashlight into an LED oneby moluscoon September 8, 2009

Table of Contents

License: Attribution Non-commercial Share Alike (by-nc-sa) .............................................................................

Intro: How to mod and old flashlight into an LED one ..................................................................................

step 1: Material ..............................................................................................................

step 2: Assembling the LEDs ....................................................................................................

step 3: Wiring ...............................................................................................................

step 4: Close and enjoy ........................................................................................................

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License: Attribution Non-commercial Share Alike (by-nc-sa)

Intro: How to mod and old flashlight into an LED oneIn this instructable, I will show how to mod this classic model of flashlight into a new LEDs flashlight. Basically replacing the old light bulb with a bunch of LEDs.

Image Notes

1. 18 LEDs. The old flashlight gets renovated!!

Image Notes

1. Old lightbulb

step 1:MaterialThis is a pretty cheap instructable (provided you have the flashlight already!).

You'll just need:

-The flashlight-18 LEDs-A bit of a styrofoam tray (or anything that could work as a frame for the LEDs but also that can be pierced, like wood, cardboard, plastics...);-Some thin wire

And as tools:

-Pliers-Wire cutter

-Cutter knife
http://creativecommons.org/licenses/by-nc-sa/2.5/


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Image Notes1. 5mm white LEDs2. Styrofoam tray.

Image Notes1. Old lightbulb and mirror2. Old lightbulb replacement3. Colour lenses stored in the bottom. Hidden fun!!4. Two 1,5V batteries5. This is where the LEDs will be fitted

Image Notes1. Pliers2. Wire cutter3. Cutter knife

step 2:Assembling the LEDsYou just need to cut a circle of the white foam and drive the LEDs into it. There's one in the middle, six in the inner circle and 11 in the outer circle.

Make it in a way that pins with the same polarity are all in the same circle as shown on the circuit scheme. (Notice that in the circuit scheme there are more LEDs thanfinally put).


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Image Notes1. Cut with the cutter knife2. Drive pins into the circle.

Image Notes1. Red circles are possitive and black are negative, but actually... could be theother way around

step 3:WiringI'm not changing anything in the flashlight except the lightbulb so the voltage provided remains the same, that is 3 volts (two batteries of 1,5V each). Each LED needs bit more than that*, so we'll just need to connect them altogether in a shunt configuration (i.e. all positive pins together and all negative pins together). We won'to needany current limiting resistor as the intensity will be less than the maximum, because of the low voltage applied.

The simpler way to do it is as you can see in the pictures. Arrange them in circles, and then connect the circles with the same polarity. Then connect the circles to thebattery terminals.

*The voltage will be less than required, and so it will be the light output. In case you want more voltage you'll need to hack the batteries system too. For example fittingsmaller batteries of 1,5V each. In that case you would need a current limiting resistor, but that's out of the scope of this instructable).

Image Notes1. Red circles are possitive and black are negative, but actually... could be the

Image Notes1. Sloppy conections2. Positive and negatve wires to battery terminals


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other way around

step 4:Close and enjoyNow just close the lid in which you fitted the LEDs and be ready for the light!!

If you decide to do it, please try to do it cleaner than mine!! Consider mine as a first attempt to be improved.

Image Notes1. 18 LEDs. The old flashlight gets renovated!!

Image Notes1. I swear the light is much more intense than it seems in this picture. Its actuallypretty impressive!!!

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