Capacitor to remove LED flicker - Page 3 - Electronic Circuits Projects Diagrams Free

ericgibbs · 29th October 2009, 11:04 AM

Quote:

Originally Posted by Airian_007

Thank You bountyHunter
But the main Problem is
i am confused about the voltage and current requirement for the led so
plz give me some information about the voltage and the current ratings of some different led's
and some math to calculate resistance
i am waiting for reply
once again thanx

hi,
Look at these images, the current depends upon the LED type, which type do you have.?

Sceadwian · 30th October 2009, 01:38 AM

Airian generally you don't calculate a resistance for a diode, because it changes dynamically with the voltage/current going through it and it's temperature, though you can make observations.

A simple example is a common white LED might be rated at 3.6 volts forward @ 20mas of current, which works out to being the same as a 180 ohm resistor. A diode is not linear though, say for example you increase the voltage to 3.7 volts you would expect a 180 ohm resistor to only increase it's current from 20ma to 20.56ma where as an LED could increase to 25ma or more. Experimentation and observation will teach you better than a data sheet or personal testimonies will.

Airian_007 · 31st October 2009, 10:58 AM

Thanks For The Information
God Bless You
I Have White LED's

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30th October 2009, 01:38 AM	#32
Sceadwian	Airian generally you don't calculate a resistance for a diode, because it changes dynamically with the voltage/current going through it and it's temperature, though you can make observations. A simple example is a common white LED might be rated at 3.6 volts forward @ 20mas of current, which works out to being the same as a 180 ohm resistor. A diode is not linear though, say for example you increase the voltage to 3.7 volts you would expect a 180 ohm resistor to only increase it's current from 20ma to 20.56ma where as an LED could increase to 25ma or more. Experimentation and observation will teach you better than a data sheet or personal testimonies will. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

31st October 2009, 10:58 AM	#33
Airian_007	Thanks For The Information God Bless You I Have White LED's Last edited by Airian_007; 31st October 2009 at 11:00 AM.