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Weisswelsh

"Oblong things" on strings

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Hi Everyone. Just a really quick question. I've been making my displays and noticed something odd about my red lights from LEDHolidayLighting. All of my 100 count M5 strings (blue, green,white) all have 2 "oblong" things on the ends and 2 "oblong" things near the center. I'm too lame to know what they are for. However, my 100 count M5 red lights don't have the 2 oblong things in the middle of the string. Is that a problem or just normal for Red?

Laurie

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I've never attached a picture before, so this may not work. This picture shows the 2 oblong things on the green light set (100 ct M5). All of the blue, green and white sets have these in the center on the string and the ends of the string (total of 4). But all of my Red strings don't have the 2 in the middle (as shown in the picture.) Is that normal for red?

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They are the rectifiers that convert AC to DC. The number and location of them vary from string to string. They have nothing to do with being able to dim the string.

Some strings have them in the plugs, others place them in-line. The number of them depends on the LED voltage and how many are in each series.

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Thank you everyone for your help.

Chuck, thanks so much for explaining that to me. I hooked up the light set to a controller box and they dimmed just fine, just as you said they would. :)

I'm learning something new everyday :)

Again, thanks for your help.

Laurie

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I'm not saying all LEDs can be dimmed without damaging them. I'm just saying those "oblong things" don't indicate that they can or cannot be dimmed in and of themselves.

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Laurie,

I have to ask you something. I also have LEDs from LED Holidays. At the male plug end, is there a round can then the oblong thingy?

Chuck,

Steven posted about a week ago that he cracked open on of the oblong things and he found a resistor inside. This would be the current limiting or voltage dropping resistor. The rectifier was a can just after the male plug. The can is about .75" dia and about 1" long. I have only the 70 ct strings. I suppose that the 100 ct might be slightly different. I also wonder about her oblong warts? Mine have 1 wire at one end and two at the other. According to Steven on the two wire side. One wire goes to the bottom of the resistor. At the other end, the second bottom wire goes to the top of the resistor and the one top wire also goes to the top of the resistor.

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Chuck,

Steven posted about a week ago that he cracked open on of the oblong things and he found a resistor inside. This would be the current limiting or voltage dropping resistor. The rectifier was a can just after the male plug. The can is about .75" dia and about 1" long. I have only the 70 ct strings. I suppose that the 100 ct might be slightly different. I also wonder about her oblong warts? Mine have 1 wire at one end and two at the other. According to Steven on the two wire side. One wire goes to the bottom of the resistor. At the other end, the second bottom wire goes to the top of the resistor and the one top wire also goes to the top of the resistor.

Well, there are "rectifiers" and then there are "rectifiers". I think some manufacturers really just have mini power supplies to boost the voltage. They throw a capacitor in there to help prevent flicker rather than an actual "rectifier" (a full-wave bridge of 4 diodes.)

Either method probably works as well as the other.

I was not an EE in college. As long as my lights don't flicker or catch on fire I really don't care what they do. ;)

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Laurie,

I have to ask you something. I also have LEDs from LED Holidays. At the male plug end, is there a round can then the oblong thingy?

Hi Max-Paul,

Yep, there is also a can-shaped thing right before the oblong item. Such technical terms I'm using. :)

Laurie

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