Resistor for LED?
#1
Resistor for LED?
I'm going to be running a few LEDs and need to know what size resistors I need to make them work on a 12v system. Here's the LED specs:
Absolute Maximum Ratings:
Reverse Voltage 5.0v
D.C. Forward Current 20mA
...other info
Forward Voltage @ 20mA(V):
Typ: 3.5 Max: 4.5
This info can be seen at http://www.allelectronics.com/spec/LED-59.pdf
Can anyone help me?
Thanks!
-Eric H
------------------
**1995 White Camaro Convertible 3.4 A4 Pics!
*Leather & Power Everything
-RK-Sport Big Block Hood & Sport Wing; Custom Racing Stripes
-17x9˝" König Monsoons
-Flowmaster w/ Quad 2˝" Tips
-Viper Alarm, Pioneer DEH-P720, RF 800a2, Two RF He2 12"
-Minnesota F-Body Club
Absolute Maximum Ratings:
Reverse Voltage 5.0v
D.C. Forward Current 20mA
...other info
Forward Voltage @ 20mA(V):
Typ: 3.5 Max: 4.5
This info can be seen at http://www.allelectronics.com/spec/LED-59.pdf
Can anyone help me?
Thanks!
-Eric H
------------------
**1995 White Camaro Convertible 3.4 A4 Pics!
*Leather & Power Everything
-RK-Sport Big Block Hood & Sport Wing; Custom Racing Stripes
-17x9˝" König Monsoons
-Flowmaster w/ Quad 2˝" Tips
-Viper Alarm, Pioneer DEH-P720, RF 800a2, Two RF He2 12"
-Minnesota F-Body Club
#2
OHM's law states that...
V = I x R
V = voltage
I = current
R = resistance
Since the V and I are known you get...
R = 12v / 20ma
R = 600 ohms
When the car is running that voltage figure will go up to 14v or so.
R = 14v / 20ma
R = 700 ohms
You don't want to run the LEDs right at their current limit so use 1k ohm resistors to be safe.
I = 12v / 1k
I = 12ma
V = I x R
V = voltage
I = current
R = resistance
Since the V and I are known you get...
R = 12v / 20ma
R = 600 ohms
When the car is running that voltage figure will go up to 14v or so.
R = 14v / 20ma
R = 700 ohms
You don't want to run the LEDs right at their current limit so use 1k ohm resistors to be safe.
I = 12v / 1k
I = 12ma
#3
Thanks man! You've always been a big help in this forum.
-Eric H
------------------
**1995 White Camaro Convertible 3.4 A4 Pics!
*Leather & Power Everything
-RK-Sport Big Block Hood & Sport Wing; Custom Racing Stripes
-17x9˝" König Monsoons
-Flowmaster w/ Quad 2˝" Tips
-Viper Alarm, Pioneer DEH-P720, RF 800a2, Two RF He2 12"
-Minnesota F-Body Club
-Eric H
------------------
**1995 White Camaro Convertible 3.4 A4 Pics!
*Leather & Power Everything
-RK-Sport Big Block Hood & Sport Wing; Custom Racing Stripes
-17x9˝" König Monsoons
-Flowmaster w/ Quad 2˝" Tips
-Viper Alarm, Pioneer DEH-P720, RF 800a2, Two RF He2 12"
-Minnesota F-Body Club
#4
You're very welcome.
I've been doing this stuff for longer than a lot of guys on this board have been alive. If my experience can be of any help to others then great. I'm glad to help when I can.
I've been doing this stuff for longer than a lot of guys on this board have been alive. If my experience can be of any help to others then great. I'm glad to help when I can.
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