Resistors

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Focusedonsound

Copper - Posts: 95

Joined: June 13, 2003

Location: United States

Posted: August 22, 2006 at 9:46 AM / IP Logged

Im going to be wiring up some LED's and Blue, Green, RED, White & UV. I have tons and tons of 1/4w resistors is it necessary to use 1/5w or can I use the 1/4 & double up or something?

Thanks for the help

Nick

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djfearny2

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Joined: September 23, 2002

Location: United States

Posted: August 22, 2006 at 10:58 AM / IP Logged

use 1kohm 1/4 and youll be fine.

Jon

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Cameronjc

Member - Posts: 29

Joined: February 06, 2004

Posted: August 23, 2006 at 3:26 PM / IP Logged

1k ohms is over kill. It will work, but you'll be getting much less the output it's capable of.

Anyway you want to use 1/4W resistors minium with the correct ohms for the LED and input voltage you plan to use.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: August 24, 2006 at 1:28 PM / IP Logged

To properly size your resistor you need to multiply resistance by voltage to figure out the power.

For a 5vdc LED with a 470ohm resistor you would be looking at 10.6mA, which equals 0.053 watts.

A 1/8th watt resistor is good for 0.125 watts, so you should be OK with a much smaller resistor.

For a 14.4vdc LED with a 470ohm resistor you would be looking at 30.6mA, which equals 0.44 watts, so a 1/2watt resistor would be needed.

Finally,

For a 14.4vdc LED with a 1000ohm resistor you would be looking at 14.4mA (quite a bit of current for most LEDs), which equals 0.21watts, making the 1/4 watt resistor perfect!

Kevin Pierson

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Resistors

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