From: "Frontline Electronics"
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <4dqpuugil5jens3iu7uprml0hdjl5e5dqs@4ax.com> <3DEDB1CD.EF3761C7@fanwap.com> <3DEEFDF5.DFFA3679@fanwap.com>
Subject: Re: Best way to power array of LEDs?
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Message-ID: <0PdI9.46871$hK4.4113133@bgtnsc05-news.ops.worldnet.att.net>
Date: Sat, 07 Dec 2002 03:21:32 GMT
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NNTP-Posting-Date: Sat, 07 Dec 2002 03:21:32 GMT
Organization: AT&T Worldnet
Yes, if you are not concerned about even illumination.
Most manufactures change design values for batches
of LED's not piece parts. Each manufactures batch is fairly
consistant overall.
Now they have a new PINK color out.
Anyony played with it yet?
Jeff
--
Remove NS to respond
Tong Narak wrote in message <3DEEFDF5.DFFA3679@fanwap.com>...
>Connect only one 3.01v still take ~150mA.
>Each LEDs has it own characteristic.
>So U can mix it in parallel as many company did it in headlight,
>brake light, etc.
>
>
>
>Tong Narak wrote:
>>
>> LED look like simple but it is not simple.
>>
>> In theory, you can't parallel LEDs.
>> But in practicle, I can parallel superbright LEDs.
>> Many car brake light, they parallel them too.
>>
>> I mixed by parallel 3.4v 3.5v 3.6v 3.01v (forward voltage LEDs @20mA)
>> with a 3.6v regulator.
>>
>> The forward current will vary automatic with the increment of
>> the input voltage.
>> the one 3.01v won't hog all current as someone said in this thread.
>> 3.01v take ~150mA
>> 3.4v take ~60mA
>> 3.5 take ~40mA
>> 3.6 take ~20mA
>>
>> when remove the 3.01v LED, another LEDs still take the current
>> at the same value.
>>
>> So. You can mix it in parallel. The lowest forward voltage LED
>> will not hog all current.
>>
>> Tong