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resistor will permit a "cap" to be put on the current going through the LED (assuming a constant voltage source). In series, only a single resistor would be used...but a precise calculation regarding the actual voltage supply would need to be performed. In parallel, a single series resistor can also be used (before the parallel branches). In this arrangement, though, subtle differences in current are likely from LED to LED. Often, though, this is seen as an economic trade - off to the "brute force" approach of using a single resistor for each parallel branch. For all practical purposes, a single resistor is sufficient regardless of the arrangement (series or parallel). Just make sure that you know the precise current and voltage specifications of the LED and to the math on what the voltage drop and current will ultimately be given your voltage source and the resistor chosen.
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534:. Since LEDs are current mode devices, and people are more used to thinking in terms of voltage, there is some use for this article. I found it when I was trying to find the current for a white LED (which it doesn't explain). Some discussion (and links to) articles about current/voltage characteristics of semiconductor diodes could be useful.
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For LEDs in series, a single resistor is fine, as it will limit the current to all of them. In parallel, small differences in forward voltage drop will make large differences in current. That can make visible brightness differences, even if the current stays within limits. For multiplexed LEDs,
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I have noticed for a long time that physicists usually write equations where variables have units, but engineers often factor them out. In the section on calculating the series resistor, each of the variables has its units indicated. That is, the units are factored out. There aren't so many
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It's been done both ways. The purpose of the resistor in all cases is to limit the current through the LED (s) to prevent an overcurrent cascade (as the LED heats, internal resistance decreases...unchecked, this can cause the current to further increase and eventually burn - out the LED). A
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I removed the advertisement because it didn't describe the technology but rather named some features. Even after reading the UK patent # GB2449616, i cannot write something about the inner workings of such an RAIS. So if someone can write something technical about RAIS it would be useful, but
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Does every LED require it's own resister or only one resister per circuit? Say I want to create my own
Christmas tree decoration. I have 100 green and 100 red LEDs. Can I just connect them end-to-end and have 1 or 200 resisters - or does each LED need to be on it's own individual circuit?
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article where it has considerably more context and usefulness to the reader. What's left here seems entirely self-evident. I personally don't see any reasonable possibility of expansion and propose returning this page to the redirect state as the AFD discussion participants suggested.
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commonly called the "LED circuit" or that "LED circuit" refers to a dedicated circuit for lighting an LED? Otherwise, this seems to me to be to just be a simple circuit containing an LED. Why not call it a "resistor circuit" or "voltage source circuit"?
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By claude, Posted on Sun Jan 28th, 2007 a tutorial to making factory-made-look-a-like LED bulbs. about converting regular GU4(MR11) halogen bulbs to LED bulbs 12V 22-LED very detailed photos good discussion of line-voltage circuits (non-tech)
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I didn't get a chance to participate in the AfD because it was closed two hours after being opened, so I didn't get a chance to suggest deletion. Is there a reliable source, other than examples in textbooks, to support that there exists a
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Posted by
Matthew Sun, 26 Feb 2006 LED lighting is becoming increasingly popular in ... household lighting. This article intends to be a comprehensive guide to their advantages, powering them, and creating dimming solutions.
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LEDs often have more leakage current, and so are not as good for sensors are Si photodiodes. There might be some optical communications devices that use the LED for both send and receive, simplifying the optics.
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Can we have something talking about how this works and how "readings" of the current light level can be taken? I'm very poor at electronics but had heard of this novel use and was wondering how it could be done.
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This is an odd article. There is about one thousand times as much to say about this subject. There should be lots of links to external resources, esp until the article is more than the bare basics.-
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I've added additional sources to expand on the typical applications of a LED in a circuit, and to show that the subject is covered as a stand-alone entity in RS. There is a developing category on
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choices, but if the variables have units, there is no need to indicate them. One might, in fact, us mA for current, and so the resistance would come out in kilohms.
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This page currently boils down to "an LED circuit is a circuit with an LED in it". All the useful material has already been merged into the
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There are 23 different LED-related pages, and I think there should be less than half that many. I've started a discussion on this at
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By commanda, Section Light Posted on Fri Apr 20th, 2007 constant current sources
Extended discussion of circuit theory and practice
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If anyone has some circuit diagrams they would like to share, that would be very much appreciated. --Dan 13:56, 13 June 2006 (UTC)
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on
Knowledge (XXG). If you would like to participate, you can choose to edit the article attached to this page, or visit the
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LEDs are similar in operation and construction to a diode in that they also allow current to flow in one direction only
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Find out how to make your own LED spotlight bulbs 12VDC 22-LED Aluminum sheet, superglue, hotmelt good assembly photos
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By clone477 Posted on Wed Oct 5th, 2005 Anyone design 120V AC LED Lighting?? serious theory/discussion/experience
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The first sentence of the article says "light emitting diode", thus they "are" diodes not "similar". •
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As to how it works, that might be usefull, as for measuriments
Wikipdia is not a
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The RAIS section appears to be a blatant advertisement. Should we delete?
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and this article should remain as a stand-alone piece in that context.
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you only need one resistor for each one that is on at the same time.
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Why is this article up for deletion? I'm not sure I understand.--
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What are the best sources of detailed reviews of LED devices?
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Here is Plans for the LED Cave Light, Revised 11-20-01
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What circuits are used in commercial multi-LED lamps?
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What are the best circuits for DIY experimentation?
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453:by yetion Oct 1, 2005; battery bike light
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398:* Dimming your LEDs (with PWM)
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