A Simple LED Tower
Intro: A Simple LED Tower
I am fascinated by light. Especially different color light.
So I build this simple LED Tower with a few color changing LED's too.
So I build this simple LED Tower with a few color changing LED's too.
STEP 1: Gather Parts
What you need:
a bunch of 1K ohm resistors
a bunch of LED's
a blank circuit board
solder
a soldering iron
a 9v battery clip (use and old 9v battery if you don't have a battery clip.)
a 9v battery
a bunch of 1K ohm resistors
a bunch of LED's
a blank circuit board
solder
a soldering iron
a 9v battery clip (use and old 9v battery if you don't have a battery clip.)
a 9v battery
STEP 2: How to Solder
Solder all the negatives of the LEDs together.
Solder one side of the 1K resistors to the positive side of the LED's
Now Solder all of the other side of the 1K resistor together.
Solder one side of the 1K resistors to the positive side of the LED's
Now Solder all of the other side of the 1K resistor together.
STEP 3: Power It Up
Now attach the 9v positive to the connected together side of the resistors and the negative to the LED's negative.
3 Comments
amandaghassaei 11 years ago
powerman666 11 years ago
amandaghassaei 11 years ago
R >= [ (power supply voltage) - (forward voltage of led) ] / (max forward current in amps)
so for your leds it's probably around:
R >= (9V-3V) / 0.020A
R >= 300ohms
it's a good idea to pad this a little to prevent damaging your leds, 500ohms should be good. Using too much resistance will not hurt the led, but it will make it glow dimmer.