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Author Topic: A quick question on wiring leds  (Read 927 times)

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Offline Bealman

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Re: A quick question on wiring leds
« Reply #15 on: January 02, 2019, 11:48:58 PM »
I've discovered I have two different shades of green, just tested them all with the same 12vdc supply and there is quite a marked difference when lit, and very little difference when unlit.

Did they all come with the position indicator kit/unit or did you buy them separately?    LEDs aren't expensive, I'd be tempted to put that lot to one side for some other use, and just order yourself a new batch.

Yes, I agree. That way you're guaranteed they'll all be the same. Saves all the hassle of trying to get the resistances right to make them all the same brightness.

I note in the Jaycar catalogue that many different light outputs are offered!
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Offline Railwaygun

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Re: A quick question on wiring leds
« Reply #16 on: January 03, 2019, 08:08:59 PM »
you can get versions with built in resistors as well
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Offline sprogman

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Re: A quick question on wiring leds
« Reply #17 on: January 04, 2019, 01:29:36 PM »
you can get versions with built in resistors as well

You can, and if they are too bright?...just add a resistor :)

Offline geoffc

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Re: A quick question on wiring leds
« Reply #18 on: January 05, 2019, 09:55:52 AM »
If you are buying new LED's why not try one with a variable resistor in the circuit set at 1000 ohms. If it is still too bright adjust the variable resistor until the brightness suits you. Then measure the resistance of the variable resistor and buy the resistors that are closest to this reading.

Geoff

Offline DaveGlew

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Re: A quick question on wiring leds
« Reply #19 on: January 19, 2019, 06:09:07 PM »
you can get versions with built in resistors as well

You can, and if they are too bright?...just add a resistor :)

Something to note is that each colour uses a slightly different "forward voltage" so if you use the same resistor value for each colour you may get varying brightnesses. This doesn't bother me too much and so I always use a 510 ohm resistor with a 1wv supply. However, this is a definitive guide for you......
https://www.digikey.co.uk/en/resources/conversion-calculators/conversion-calculator-led-series-resistor
If it looks right and it works then I'm happy.

 

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