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Thread: Mighty Mini LED RGB Flood

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    Trying to behave here-NOT John's Avatar
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    Default Mighty Mini LED RGB Flood

    There was a discussion about Might Mini LED Flood that was tacked on to the LOR Flood thread.

    Since there was interest being shown, I decided to start a new thread so we wouldn't have to wade through the LOR posts first.

    I'll repost the Mighty Mini links that were contributed

    About the flood: NOTE - resistor values mentioned are WRONG

    http://www.kostyun.com/led-displays/mightymini/

    Board only order:

    http://store.kostyun.com/product.php?id_product=37

    LED / resistor package: CORRECT resistors included

    http://c-leds.com/store/product.php?id_product=42

    Flood Light Head:

    http://www.cooperlighting.com/common...logen&id=11963

    Lowes # 71461 dual head $19.98 (what I have)
    http://www.lowes.com/pd_71461-337-TM...ategoryDisplay

    Lowes # 17300 single head $ 9.98
    http://www.lowes.com/SearchCatalogDi...7300&x=10&y=11

    another online source http://www.castlewholesalers.com/REG...ht-Bronze.html

    Power Supply:

    the one Mark has: http://www.circuitspecialists.com/prod.itml/icOid/9590

    the one I have: http://www.mpja.com/prodinfo.asp?number=16854+PS

    Assembly Instructions circuit board : NOTE: WRONG resistor values are mentioned

    http://www.kostyun.com/PDF/building_mighty_mini.pdf

    Add'l info on Flood head:

    http://www.doityourselfchristmas.com...blog.php?b=216


    I think these were all the most important links for this project. Feel free to add others.

    I'll use mine with the LOR DC controller, d-light will also work, as well as some of the DIY DC boards.
    Last edited by Carl B Zachary; 02-20-2010 at 06:06 PM.
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

  2. #2
    This space for rent. Al in Raleigh's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    Thanks Mark. I need a 12 Vdc 7+ amp supply for my singing pumpkins. I was looking at LEDs this morning and we would save a lot by doing a bulk buy. I want to make about 10 floods which is a sizable number of LEDs. I agree with you that having a constant current source would be the way to go with greater control of the colors over long distances.

    I looked into using 1 watt LEDs. I read somewhere that the enclosure got warm with the 0.5W 8mm LEDs. I wanted the extra light capacity of the 1W LEDs. My concern is that the 1W LEDs would provide too much heat and the enclosure could not dissipate it properly. So, I'm convinced that using 0.5W 8mm LEDs are the way to go. Mark does your enclosure get warm? The person that reported the heat problem was over-driving the LEDs too which was likely the problem. The 1W LEDs are 125% more expensive too. I figured for 10 spots the cost would be about $750 which is more than I would allocate. So, again, I think that I will stay with the 0.5W 8mm LEDs.

    I must have missed something somewhere, but the BOM for the Mini called for Warm white and brilliant white LEDs. I wonder why. I am convinced that the LOR floods will be about $150+. After looking into the parts cost, the LOR flood would be cost prohibitive for me. Before I commit to buying a bunch of stuff and doing a group buy, I want to see Mark's in person at the TASL meeting. Thank you for bringing it Mark.
    Al

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    Default Re: Mighty Mini LED RGB Flood

    I stole this image from DIY Christmas, so I wouldn't have to look for it as a reminder when I start building my boards
    Attached Thumbnails Attached Thumbnails -led.gif  
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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    Default Re: Mighty Mini LED RGB Flood

    Quote Originally Posted by Al in Raleigh View Post
    .

    I must have missed something somewhere, but the BOM for the Mini called for Warm white and brilliant white LEDs.
    Al, the reason for the two different shades of white is that those warm white LEDs ran a little to the yellow, therefore the other 6 are the cool or brillant LED to balance / remove some of the yellowish output.
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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    Default Re: Mighty Mini LED RGB Flood

    Question for AL:

    Could a LM3xx regulator be used with either of the pwr supplies above to limit the current?

    If so, would it be placed on the power supply ouput, or on each output channel of the controller ?

    Would other components need to be used also to provide constant current?
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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    This space for rent. Al in Raleigh's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    Quote Originally Posted by John View Post
    Question for AL:

    Could a LM3xx regulator be used with either of the pwr supplies above to limit the current?

    If so, would it be placed on the power supply ouput, or on each output channel of the controller ?

    Would other components need to be used also to provide constant current?
    Yes , maybe, and no. I would not use it. If I remember correctly an LM317 is nothing more than an op amp circuit that can source up to around 1 amp or thereabouts. If you took the output and feed it directly back into the adjustable leg then you essentially have an op amp circuit. The problem there in lies with making it adjustable. I guess you could feed the LM317 with a D to A converter (LOR DC Controller would be fine) and the LM317 would provide the necessary high impedance output for the constant current source. Due to the LM317 only being able to source up to an amp or so you would need one LM317 per 4 or 5 spots. That is assuming that you are using the 8mm 0.5W LED. Using the LM317 would limit the operating voltage to levels less than what the spot was designed for meaning circuit modifications to the PC board. I may have overlooked something here.

    Nice thought John, but it would get ugly. Denny, Mark, and myself will discuss this in detail at the meeting along with whether we should design our own boards.

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    Default Re: Mighty Mini LED RGB Flood

    Thanks Al

    Keep the "rest of us" posted.

    I will be using Frank's board (with the CORRECT resistors) and my LOR DC board, unless you three brains come up with something different or a good reason not to. I already have the pwr supply, flood light heads, and have ordered the boards from Frank. The only other thing I would need to do is order the LEDs and resistors from CeCe when I get the boards.

    Possibly by using the correct resistors, a constant current supply may not even be needed, since the LEDs won't be overdriven.
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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    This space for rent. Al in Raleigh's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    John, we might be able to make you part of the group buy. Don't order your LEDs until after the TASL meeting. We could save you and us some serious money.

    Unless you have bought your dc controllers you might consider the ServoDog. It has 2 PWM MOSFET outputs that could handle up to 8 or 9 spots each channel. The ServoDog's physical size is very tiny and would strap on the spots very easily.
    Last edited by Al in Raleigh; 01-31-2010 at 05:48 PM.

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    Default Re: Mighty Mini LED RGB Flood

    Thanks Al.

    I was going to wait on the LEDs and resistors until after I had received the boards, which will probably be sometime in late March
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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    Default Re: Mighty Mini LED RGB Flood

    Thanks, John, for starting a thread for just these floods.

    The enclosure didn't get that warm, but then again, I didn't have them out in the yard, and didn't have them on too long. I need to try another overnight test.

    I just got finished putting CAT-5 ends on my cords for these, and for the controllers that I'm using to drive them. This makes is very easy to put the floods where you want them, since you can use standard cables.

    RPM on DIYC just posted a design for a 16 channel DMX controller that uses IC's to drive up to 500mA per channel - no FETs, which might be much cheaper than the LOR-DC board or even the DMX8 board that I'm using. Most of the existing boards (D-light, LOR, DMX8 DCSSR, MR16) are rated for lots more than 500 mA per channel to drive other things than these LED floods. This would be good for 4 floods per controller.

    Frank has a Renard 24LV board as well for those using Vixen to drive the floods.

    I'm all up for a bulk buy for LED's and resistors after the Feb meeting. Of course, my bank account is much smaller due to the preorder from Paul @ CDI. But I might be willing to do the ordering if we get enough interest.
    Mark

    New location - new display. Looking forward to 2015 season!

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    Professional Net Lurker Jack Stevens's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    Dumb question, since it's been a long time since I've done any circuit design work - my eyes don't handle detail work well any more.

    With the use of a bridge rectifier and proper resistor selection, couldn't these be run off 110 VAC? Or would there be noticeable rectified AC flicker in what's getting "washed"? If this can be done, I'm thinking a self-contained unit with an SSR4 and possibly a wireless receiver in it, to simplify flood unit placement. There may be dimming issues, though.

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    Default Re: Mighty Mini LED RGB Flood

    Quote Originally Posted by Jack Stevens View Post
    Dumb question, since it's been a long time since I've done any circuit design work - my eyes don't handle detail work well any more.

    With the use of a bridge rectifier and proper resistor selection, couldn't these be run off 110 VAC? Or would there be noticeable rectified AC flicker in what's getting "washed"? If this can be done, I'm thinking a self-contained unit with an SSR4 and possibly a wireless receiver in it, to simplify flood unit placement. There may be dimming issues, though.
    You can't really dim LED's this way, because you have to limit the current you try and push thru them. That's what the resistors for in the current flood, to limit the voltage and current passed thru each resistor. The way folks dim LED's is by Pulse Width Modulation (PWM), which basically means you turn on the LED for less time when you want it dimmer. Varying the AC voltage with a SSR4 won't accomplish the same thing, I think, although the C7/C9 replacement LED bulbs do dim quite nicely, but they're designed to handle 110V AC
    Mark

    New location - new display. Looking forward to 2015 season!

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    This space for rent. Al in Raleigh's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    Mark is correct. You would need a huge resistor of about 30watts (assuming fullwave rectification) somewhere, most likely inside the enclosure which would act as a toaster oven for the LEDs. The LED strings drop the voltage across many LEDs in series and then have a smaller wattage resistor in series. It is a nice thought though.

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    This space for rent. Al in Raleigh's Avatar
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    Default Re: Mighty Mini LED RGB Flood

    Before I forget, RJ has announced his version of the Mighty Mini using DMX control. For those that are new to this, RJ is developing DIY gear on another forum. The LYNX Express is one of the designs. Essentially, RJ's version is a generic version of the LOR flood. Now before you get all excited he is planning to use fewer LEDs with higher wattage ratings. So does the LOR flood. Both designs will have problems with heat dissipation and parts cost. Big problems. The Mighty Mini, in my screwed up opinion, is the most viable and cost effective solution on hand at the moment. I will elaborate more on this after the Feb 20th meeting. I wanted to table this topic before it came up. RJ will need to convince me that the LEDs aren't going to burn holes into the phenolic of the PC boards. The LED industry has made astronomical leaps and bounds in the last couple of years but the heat dissipation problem continues to plague them at the higher candela LEDs. This could change in a year or two. In the foreseeable future I don't see it happening. But, I am out of the cutting edge loop and am proud of it. Other people on this forum are closer to the matter than myself, and I welcome their opinions.

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    Default Re: Mighty Mini LED RGB Flood

    Al,

    I know that I am old and blind, but I can't find the thing you mentioned on RJ's site. Do you have a link?

    regardless, I'm building the MightyMini's for this year. Last summer I watched Frank's announcement for the boards, but knew I wouldn't have time last year, but I did go ahead and start collecting everything needed.

    I already had the LOR DC board, so I went ahead and acquired the 24 volt power supply and the flood heads, and a new temp controlled solder station with LED temperature read out.

    I ordered the boards from Frank's store a couple of weeks ago, so I have everything covered except the LEDs and resistors, just waiting on the group buy if it happens.
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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