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chuckd

Easiest Terminators/Snubbers to make

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Those waveforms, especially when you see a half cycle full on, and the other half dimmed, create huge amounts of noise that kicks back through the LOR unit, and into other channels.

Last year when I had 'bad' LED strands, just trying to dim a single strand caused disco effects everywhere. But, those strands had built in capacitors that were quite large, so no reasonable terminator was going to work.

Much depends on your LED manufacturer, but it wouldn't surprise me at all if a terminator cleans it all up. I'd terminate them all, however, since you never know which strand might cause a problem. It can change by temperature, moisture, etc, you really never can tell. Also, just because you can't 'see' it doesn't mean it isn't happening. If you were getting that waveform on a 90% intensity setting, for example, you may not notice it. But it would be kicking back extra noise.

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Chuck,

Thank you for a very informative post. I'm running completely on CDI LED strings so this is very helpful.

I just ordered the plugs and resistors. Do you have any recommendations for the type of silicone sealant?

Thanks,

Mark

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Just a good outdoor silicone caulk. Something for windows and doors will work just fine. I used black, but any color will do just fine.

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As for damaging LED's, I would say probably not, but then again I don't know much about other brands of LED's either.

The resistor can go in either direction. There is no 'polarity' to a resistor. It's really as simple as it seems.

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chuckd,

Which LEDs were you using in those scope pictures?

Could you post more information about the setup so that I can try and duplicate it in the context of the diy controllers?

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Those are the CDI 2009, 50 count C6 blue LED's. These are basically the 'Holiday Creations' style, which means it has three warts in the strand.

I simply connected one box to a PC by itself. Plugged either a single strand, 6 strands end-to-end, or 24 strands end-to-end all into channel 1, with nothing in the other channels. The terminator either went into the stackable plug at the first LED strand, or the very end of the strand in the one example with 24 strands.

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Thank you for the information. I was just removing a bulb from my strand and adding an incandescent. It pulled out most of the power for me. I like your method much better. I am going to be making an order for these things for next season!

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I could not wait for the spring group buy.

Ordered 100 parts last week, they just arrived.

Thanks Chuckd, great info in this post!

Glenn

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This is the easiest I have seen to date. I made 5 using 1/2 w 47k 5% resistors form Radio Shack and the picture will speak for it's self. I will go with the 1w 47k 5% resistor, even if someone has used the 1/2 w. Maybe this will save someone from having any major problems. I tried them on :

3 strings 25ct c9s

3 strings 25ct c6s

4 strings 25ct c6s

2 strings 50ct c3s

4 strings 50ct c3s

I did this now because next year I want to expand and will have more lights. I recommend that you do not use the 1/2w 47k resistor from Radio Shack. They did not work fo me.

Earle

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Earle, did those burn in half? You're sure those are half watt and not 1/4 watt?

I'm scratching my head figuring why that would happen. The resistor only needs to dissipate .31 watts when your lights are full on. The resistor might get warm, but it shouldn't become toast!

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OR, did you accidentally get 4.7K resistors? The color bands should be yellow, violet, ORANGE (not red). 4.7K would definitely flame out.

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I inserted one in my problem channel and it fixed it. I would be in for a group buy if there is one. I could see getting 100 so.

Thanks,

Chris

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The Radio Shack 1/2 watt resistor is twice as large as the ones I showed in my pictures, since they're not 'power' resistors. As such, I don't think they'll fit down in the plug like in my pictures. If they did fit like the pictures showed, then they were 1/4 watt.

The true Radio Shack half watt should work, it just won't be as pretty inside the plug. But who cares about that?

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Yes Chuck they are 1/2 watt 47-Ohm resistors 5% tolerance pkg. of 5 # 271-1105. I hope these were the ones I should have used, if not , where did I go wrong?

Yes 4 of the 5 burned into the other one looked as if it just melted. I have your item from Mouser printed out so I can order the right resistor when I decide to try this again.

Thanks Earle

I found my error I used 47- Ohm not 47K this makes a big difference, no wonder they fried.

Earle

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Yikes! That means they tried to dissipate 306 watts of power!

We used to do this kind of thing in engineering school when we were bored. Quite spectacular, though, wasn't it? :)

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Well Chuck I guess you might say I learned a lesson.

Electronics is not my strong suite, as you can tell, but, I learn very fast. I won't do that again!!!! I hope. Thanks

again for the idea and the reply.

Earle

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I had one channel acting up. It has six 100 count strings. I just added a night light to an open outlet on the channel and it seems to work. Your snubber idea may produce better fades. Something to do this summer I guess.

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Why are people expecting a group buy? The ace outlet deal won't last forever. The resistors are dirt cheap. You can make these for under $1 including shipping, not including silicone.

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Yes Chuck they are 1/2 watt 47-Ohm resistors 5% tolerance pkg. of 5 # 271-1105. I hope these were the ones I should have used, if not , where did I go wrong?

Yes 4 of the 5 burned into the other one looked as if it just melted. I have your item from Mouser printed out so I can order the right resistor when I decide to try this again.

Thanks Earle

I found my error I used 47- Ohm not 47K this makes a big difference, no wonder they fried.

Earle

Obviously this problem was found to be an error... ;)

I would like to just remind everyone IF you are going to order parts from Mouser or elsewhere, go ahead and get the "flameproof" metal oxide resistors just to err on the less spectacular side... :D

(note: the ones on the link chuck posted ARE flameproof)

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Why are people expecting a group buy? The ace outlet deal won't last forever. The resistors are dirt cheap. You can make these for under $1 including shipping, not including silicone.

Group buys are fun, and if something goes wrong misery loves company.

Sorry, I couldn't wait for the group buy, already got mine. 47k I hope :)

Glenn

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On another tangent - I made a few snubbers (in China now, testing LEDs out the wazoo next 5 days).

When I fired up the LOR 8 channel controller for the first time I heard sizzle sizzle, and 4 of the 5 snubbers now test at anything but 47k.

Will the greater resistance screw me with testing?

I did go out and pick up a few night lights (the local market (HUGE) does not carry plug in air fresheners) and converter plugs.....to cover my butt.

Any feed back tonight would be helpful, as I am off in 9 hours to factories....

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i picked up some glades for now....but if i have a 3 way split that goes to three different trees in my yard (8strands each) do i need one glade before the split or one at the beginning of each tree? thanks-

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