Adjustable Mini LED Flashlight

Do you want a small flashlight that you can change the brightness on? Do you have some LEDs and potentionometer (pots) in your junk box? Well i did, so i built myself a mini LED flashlight. This is a very simple you can do in 10 minutes or less.

Step 1 Materials

You can probably find everything you need to make this in your junk box. The only thing you might heve to buy is some perf board.

Materials:
2 LEDs of your choice-Ones that can handle 4 volts
Perf board-The stuff that you build circuts on
PotentionometerI have no idea what value mine is
9 volt battery snap connectorI love 'em
9 volt battery
9 volt battery holder
Double sided tape-Or you can just use hot glue

Tools:
Soldering iron
Wire cutters
Wire strippers
Hot glue gun

Comments

[alex-sharetskiy]

Do those leds really operate on four volts? (what's written on the package, 3 or 4 volts?) it it's 3 volts, you need 3 leds, or a resistor

[qwertyboy]

the package says 3.8 volts, but i'm just giving them 4

[GitarGr8]

The pot is a variable resistor, so you could just use it to limit the voltage going to the LEDs. It would be best practice to add a fixed resistor so you don't wear out the LEDs, however. Especially since you are supplying 9 volts, and the two 4 volt LEDs in series only need 8 volts.

[qwertyboy]

yeah, I didn't realize that after I put it all together. but I will probably update it soon, except with a resistor

[alex-sharetskiy]

my point exactly