LED Wiring, Is this correct?

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skeeler

Member - Posts: 32

Joined: August 16, 2005

Location: United States

Posted: August 16, 2005 at 1:03 PM / IP Logged

Hello all. Sorry for the request for proof reading, but I just wanted to make sure I had the wiring correct before I go to the install phase. I am doing adding some LEDs to the interior of my boat. All the LEDs are 2.5volt, add the current provided will be 12volt. Is the wiring digram I made below correct?

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: August 17, 2005 at 5:21 PM / IP Logged

What is the current rating of the LEDs? Both need to be considered when designing the ckt. What you have there is good for ~ 17mA

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skeeler

Member - Posts: 32

Joined: August 16, 2005

Location: United States

Posted: August 18, 2005 at 8:57 AM / IP Logged

ff-mike wrote:

What is the current rating of the LEDs? Both need to be considered when designing the ckt. What you have there is good for ~ 17mA

These are the LEDS I went with; http://www.lsdiodes.com/shop/index.php?main_page=product_info&cPath=1&products_id=17

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: August 18, 2005 at 9:26 AM / IP Logged

OK, I looked at the specs for the LEDs chosen

Forward Voltage: 2.1-2.4

Forward Current:: 30mA

We will also assume 13.2V for the battery on the boat when it is running

Worst case scenario

All the diodes are 2.1V. This nets us 8.2V for them, and 5.0V to be dissipated by the resistor(s)

5.0v/30mA = 167Ohms

Not a very common size. But 2 330ohms in parallel would be 165. Good enough for us

Opposite side

Diodes 2.4V, net 9.6. Boat off & battery gives us 12V. 2.4V to be dissipated

2.4V/30mA= 80 Ohm

Again, not very common. a 100 ohm would give you 24mA

The 165 ohms (2x330 in parallel) would give you ~ 15mA. Plenty to light them up

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LED Wiring, Is this correct?

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