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Thread: MR-X with X3T. Hotlips with Magic Resistor TK. #1

  1. #1
    Flashaholic* hotbeam's Avatar
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    Default MR-X with X3T. Hotlips with Magic Resistor TK. #1

    I've been thinking of getting a "magic resistor" constant current circuit done for a 9V 5-watter LS Hotlips-D package. Basically the circuit will allow the uninitiated to either put in either Alkalines, Lithiums or NiMhs and it will regulate the current to any set current, eg. 750mA, 1000mA, 1500mA, 2000mA or even up to 3A!! Adjustment is done via a 2mm screw driver and a multimeter is required. The circuit will automatically adjust the resistance to get the desired current, like a magic resistor.

    When the battery voltage drops below the LED voltage, it will basically go to a a direct driven mode. At no time will the current exceed the preset current rating above. This way, there is no chance of blowing any LSs and the brightness will be constant until the battery starts to expires.

    Just gazing interest to see if any progress (short run) should be made on this? [img]/ubbthreads/images/graemlins/icon3.gif[/img]



    ======== T H E O F F E R S (Moved from my Aug 4 post. Updated 30 Aug) ========

    MR-X with X3T binned 5 watt Luxeon (previously MR Hotlips TK)
    There will be a small number of MR-X turnkey units for sale. These will indeed be very special lights. It will come in a 6AA configuration in an Ontario Aluminium D-sized body with a Direct Drive Indicator LED. It will be finished off with a UCL lens and a special X3T binned Luxeon. Pricing: $213 shipped and insured. You will need your own NiMh batteries (or Li-ion, L91, Alk).






    MR Hotlips
    MR Hotlips will be supplied will be supplied with the complete Magic Resistor circuit embedded in the Hotlips and siliconed in place. The Direct Drive Indicator LED Indicator will be soldered in for convenience and emitter wires ready for immediate installation. Then drop it into your OAD flashlight body, connect the power and you are ready to go. You can of course adjust your desired current setting using a 2mm flathead screwdriver. Price: $58+$5 (5 day delivery). A photo of this setup can be seen below (about the ~40th post).


    (MR)
    (MR) is just the bare Magic Resistor circuit with DDI LED. This is essentially the circuit before it is fitted into the Hotlips. Price: $38+$5 (5 day delivery).

    The delivery of MR Hotlips and MR will be done after all TK orders have been fulfilled.

    ================================================


    Again, I would like to thank Burnt_retina for his invaluable input, technical advice and putting up with my countless questions. Thanks Burnt. [img]/ubbthreads/images/graemlins/bowdown.gif[/img]


    Graph of the Magic Resistor set to 1.5A. 3x123s in Direct Drive









  2. #2
    *Flashaholic* Rothrandir's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    you know what i think...sounds great! [img]/ubbthreads/images/graemlins/grin.gif[/img]

  3. #3

    Default Re: Hotlips w Magic Resistor constant current circuit?

    Yes I think they have something like that inside those EverLeds, able to run up to like -- 9V, was it?

  4. #4
    Flashaholic* Phaserburn's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Make me first on the list!!

  5. #5
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Correct Mr B. I believe they are 1-watters though? Also, it is non configurable in the amount overdrive or underdrive you want [img]/ubbthreads/images/graemlins/frown.gif[/img]

  6. #6
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    sounds good. any idea as to the price? I would be interested in 1, anyway.

  7. #7
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Phaserburn and Johnc... sounds like the interest is low. Looks like generally people want brightness at the expense of LED longetivity. Don't know about pricing yet. It will depend ~ on the final number. Will take stock after a few days.

  8. #8

    Default Re: Hotlips w Magic Resistor constant current circuit?

    Hotbeam, i would be interested in one or two. But that depends on the price, though.
    Can this accept 7.2V and go direct drive?

  9. #9
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Shiftd, price [img]/ubbthreads/images/graemlins/icon3.gif[/img] for the moment. Can't see it being too $$$.

    When the batteries are fresh, this circuit automatically adjust the resistance to give you your desired mA output... ie magic resistor concept. When the battery voltage drops below that of the LS, it will then be direct driving, but current will not exceed the set current.

    Using a V2T for your 6 NiMh will give you longer run time than using a U3U. But if you use Li's, the runtime is prolonged even more.


  10. #10
    *Flashaholic* Rothrandir's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    how big is it and when can i have a prototype? [img]/ubbthreads/images/graemlins/grin.gif[/img]

    any chance you can design it to step-up for either a 1 or a 5watter? [img]/ubbthreads/images/graemlins/wink.gif[/img]

  11. #11
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Rev I prototype done. Size ~ 25mm x 14mm. Working on heatsinking part at the moment. I am the tester here. burnt_retina is the brain.

  12. #12
    Flashaholic* yclo's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Interesting...

  13. #13

    Default Re: Hotlips w Magic Resistor constant current circuit?

    Ahh, you are right Howie, did not see the 5W part. This will be a very interesting project...

  14. #14

    Default Re: Hotlips w Magic Resistor constant current circuit?

    is it round shaped, Howard? Is it more like the powerpuck, but with smaller size and will only fit for the D sized light?

  15. #15

    Default Re: Hotlips w Magic Resistor constant current circuit?

    In fact, if you are thinking about making a drop-in unit with Hotlips as the casing, it will be the cat's meow for D-sized lights...kinda like an EverLed on steroids!

  16. #16
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    shiftd: the prototype is rectangular. i'll need to speak to burnt about changing the board make-up.
    **EDIT: Also depends on numbers required.


    mr b: that is one way to look at it [img]/ubbthreads/images/graemlins/smile.gif[/img] overkill heatsink for the FET in the circuit.

  17. #17
    *Flashaholic* Rothrandir's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    eagerly awaiting! [img]/ubbthreads/images/graemlins/tongue.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

  18. #18
    Flashaholic* shankus's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    hotbeam, I'm confused...


    [ QUOTE ]
    hotbeam said:
    When the battery voltage drops below the LED voltage, it will basically go to a a direct driven mode...and the brightness will be constant until the battery expires.


    [/ QUOTE ]
    So, it is current regulated until battery voltage drops below the luxeon forward voltage.
    After that point, then it is direct driven, so, it will become dimmer until the cells expire, right?





    [ QUOTE ]
    hotbeam said:
    When the battery voltage drops below that of the LS, it will then be direct driving, but current will now exceed the set current.


    [/ QUOTE ]
    Did you mean to say the current will not exceed the set current?

  19. #19
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Sorry if my explanations were not as clear as they could've been, yes to both your statements.

  20. #20

    Default Re: Hotlips w Magic Resistor constant current circuit?

    can we specify the current ourselves? like between 750 to 1300? that would be real cool [img]/ubbthreads/images/graemlins/grin.gif[/img]

  21. #21
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    yep [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img], the mini flat head screwdriver is your friend [img]/ubbthreads/images/graemlins/smile.gif[/img]

  22. #22

    Default Re: Hotlips w Magic Resistor constant current circuit?

    GREAT!
    now, if only you can make it as small as a micropuck [img]/ubbthreads/images/graemlins/naughty.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

  23. #23
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    This circuit is only useful for setups with supplied voltage >> LED voltage. [img]/ubbthreads/images/graemlins/smile.gif[/img]

  24. #24

    Default Re: Hotlips w Magic Resistor constant current circuit?

    will it tolerate open and short circuit? reverse voltage? over voltage? ;P

  25. #25
    *Flashaholic* IsaacHayes's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    This has peaked my interest. This will give you longer run time if you used say 8 AA NiMH batteries vs 6 for a 5w right? as you will regulate the current and yet have more voltage/current with the extra batteries right? The batt would be in series. This would be keen with my 2D mag to put in 8 AA's in a custom batt pak.

    est price? BTW, what's the current price on the hot lips heatsink?

  26. #26
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Thanks for the renewed interest. Answers to questions in no particular order:

    Open circuit: No problems at the output end.

    Short circuit: It can only tolerate a very quick short curcuit. Thermal issues need to be addressed.

    Reverse voltage: A no-no. Can be allowed for but not sure whether it is worth the extra circuitry. *** Edit: Not tolerated

    Voltage: Acceptable range between 5v and 20v.

    8 NiMh: You won't get a longer runtime (very marginal at best) with 8 NiMh. However, if you were to parallel 2 x 6 NiMh, that is a different story.

    Hotlips: Details here.

    Note: This curcuit will use top shelf components. Eg. The on-resistance for the FET is 0.0028R (!!) and sense resistor is 0.015R (!!). When the battery voltage is ~ the LED voltage, it is in-effect direct driving !!!

    At this stage, this will definately be a "very short run" (half a dozen) project, unless there is SIGNIFICANT interest. Also I am looking at supplying the "hotlips with magic resistors" in a complete light as opposed to just releasing the kits... just because of the time consuming/difficult 'mod-support' issue. Questions? Email/PM me.

    PS. Still working on fit and thermal issues at the moment. **EDIT: In the evenings [img]/ubbthreads/images/graemlins/icon3.gif[/img] Why am I doing this? Hmmm...

  27. #27
    Flashaholic*
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Sounds great! I can envision a drop-in mod as powerful as SNII...

  28. #28
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    May be interested... Depends on final size and $$.

  29. #29

    Default Re: Hotlips w Magic Resistor constant current circuit?

    Count me in!!!!!!!!!!!!!.
    Shiner
    aka>CHRIS

  30. #30
    Unenlightened
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Sounds interesting! More details please!

  31. #31

    Default Re: Hotlips w Magic Resistor constant current circuit?

    YUp, just like issac said, this thing has peaked my interest. But i still would like to see the price quote, though. Just a range will do. If it is somewhere around $20, I think i can take some from my saving acc. If it is around $40, hmm, kind of difficult, but i will try to get that out too [img]/ubbthreads/images/graemlins/grin.gif[/img]

  32. #32
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    It looks like there are about ~5 takers (1 for me!!) here so it is the short run we will be progressing on. Got to do more tests in the next few days and will let everyone know. Will need to speak with Burnt_retina about thermal and mounting issues, etc.. before going much further.

  33. #33
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    I'll be in for one please
    Chris

  34. #34
    Flashaholic* LEDmodMan's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circuit?

    Any idea of what kind of efficiency it'll have while in buck mode? Will you put the circuit design up on CPF once you've sold your small run of these? I've spent my wad here for awhile, so I can't afford this right now. I might be able to build my own with some parts on hand if they're the ones I'm guessing they are. Just curious...

  35. #35

    Default Re: Hotlips w Magic Resistor constant current circ

    yea sound like it might be fun to try. 1 or 2 depending on the price.

  36. #36
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Update:
    We did some runtimes last night on the Magic Resistor prototype. The result was very promising. [img]/ubbthreads/images/graemlins/thumbsup.gif[/img] Definately much more than 1 hour of constant brightness/current at 1A. Further tests will be done tonight at different current draws.

  37. #37
    Flashaholic* NightStorm's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Waiting with baited breath (I've got to cut down on the sushi). [img]/ubbthreads/images/graemlins/grin.gif[/img]

    Dan

  38. #38
    Flashaholic* milkyspit's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Hi hotbeam! You can tentatively count me in, though the final price of your creation will make the final decision for me. I love my 5W Blaster VI and Space Needle II's, and if I could get a light similar in size and brightness, but with the added benefit of constant current, it would be a tremendous win. [img]/ubbthreads/images/graemlins/thumbsup.gif[/img] I'm waiting anxiously for word on the next step in this project...

    Also, any chance of slipping a small red out-of-regulation indicator LED into the head, similar to the Opalec NewBeam? It's not critical, of course, but would be a nice touch. [img]/ubbthreads/images/graemlins/cool.gif[/img]

  39. #39
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Milkyspit... will be considering the out-of-regulation indicator [img]/ubbthreads/images/graemlins/smile.gif[/img] . Hopefully it won't add too much size to the circuit.

  40. #40
    Flashaholic* hotbeam's Avatar
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    Default Re: Hotlips w Magic Resistor constant current circ

    Update:
    More runtimes being conducted and plotted. More 2000mA NiMh, Alkalines and Lithiums used. Very impressed with the Lithiums [img]/ubbthreads/images/graemlins/thumbsup.gif[/img]. Out of regulation LED indicator 95% chance of being included.

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