DiyLightAnimation

Hardware => Lynx USB DMX Dongle => Topic started by: kbowen on March 16, 2011,

Title: leds help please
Post by: kbowen on March 16, 2011,

Help please I can't remember which side of the led is positive .

Thanks

Title: Re: leds help please
Post by: KeithTarpley on March 16, 2011,

Greetings,,,

The long leg is typically positive.  The short leg, with perhaps a flat spot on the led, negative.

Keith

Title: Re: leds help please
Post by: kbowen on March 16, 2011,

Thanks Keith , my first build, a little nervous here.

Title: Re: leds help please
Post by: KeithTarpley on March 16, 2011,

Greetings,,,

Thousands of units built and working.  You'll add at least one more soon.

Keith

Title: Re: leds help please
Post by: CaptKirk on March 17, 2011,

I use this when I get confused:

http://en.wikipedia.org/wiki/LED_circuit (http://en.wikipedia.org/wiki/LED_circuit)

A Google search for "led polarity" brings up a wealth of info.

One thing to keep in mind is that the picture of the LED insides does not always apply ro all the LEDs out there as I have had issues with some LEDS from Mouser (I cut the leads before inserting and then followed that diagram but had to reverse it to get it to work)

Hope it helps.

Title: Re: leds help please
Post by: JoeFromOzarks on March 17, 2011,

Here's a little diagram I made for my friends daughter.  I added diylightanimation.com and now it belongs to the entire community!

:) joe

Title: Re: leds help please
Post by: chrisatpsu on March 17, 2011,

remember, positive is usually bigger than negative...  so the positive lead is bigger (longer) than the negative

: )

Title: Re: leds help please
Post by: bisquit476 on March 18, 2011,

I use a watch battery, they are thin and the legs will slip right over them, just watch the voltage when buying the battery.

Title: Re: leds help please
Post by: dmaccole on March 18, 2011,

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I use a watch battery, they are thin and the legs will slip right over them, just watch the voltage when buying the battery.

Yes, a 2032 works great. There's always one on my desk.

But they're expensive  :( ... unless you buy them as a tea candle ...

http://www.walgreens.com/store/c/smart-candle-flameless-candle/ID=prod2630034-product

\dmc

Title: Re: leds help please
Post by: kbowen on March 20, 2011,

Thanks everyone, got it built . Now just having issues testing dongle.

Title: Re: leds help please
Post by: trekster on March 20, 2011,

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I use a watch battery, they are thin and the legs will slip right over them, just watch the voltage when buying the battery.

Yes, a 2032 works great. There's always one on my desk.

But they're expensive  :( ... unless you buy them as a tea candle ...

http://www.walgreens.com/store/c/smart-candle-flameless-candle/ID=prod2630034-product

\dmc

Or from Ebay for $2.55 for 5 with free shipping.  That is 51 cents each. http://cgi.ebay.com/5-pc-SONY-CR2032-CR-2032-3v-Lithium-Battery-NEW-Exp2019-/250499808432?pt=US_Batteries&hash=item3a52f3bcb0

Ron

Title: Re: leds help please
Post by: dmaccole on March 21, 2011,

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Or from Ebay for $2.55 for 5 with free shipping.

Yes, Ron is right ... I always go to eBay for batteries when I can.

\dmc