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Thread: Driver for 2D alkalines for about 500-600mA?

  1. #1
    *Flashaholic* wquiles's Avatar
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    Default Driver for 2D alkalines for about 500-600mA?

    I have a project in which I want to retrofit a 2D M*g body with one a multi-LED (5mm) head that will host about 30 of them or so. I need about 500-600mA from 2 D alkalines but I want to drive the LED's until the D cells are killed, gone. I want to extract as much juice from these 2D's as possible.

    What would be a good driver for this?

    Will
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  2. #2

    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by wquiles
    I have a project in which I want to retrofit a 2D M*g body with one a multi-LED (5mm) head that will host about 30 of them or so. I need about 500-600mA from 2 D alkalines but I want to drive the LED's until the D cells are killed, gone. I want to extract as much juice from these 2D's as possible.

    What would be a good driver for this?

    Will
    Any kind of boost converter should work.

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    *Flashaholic* wquiles's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by Handlobraesing
    Any kind of boost converter should work.
    Not just any kind - I want one that will drain those cells really good

    Will
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  4. #4

    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by wquiles
    Not just any kind - I want one that will drain those cells really good

    Will
    Most of them do. Is it acceptable if the output starts dimming considerably?

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    *Flashaholic* wquiles's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Yep. I have tons of these D Alkalines and I want to have a flood-like beam for emergencies so when it starts diming considerably, then it is time to trow these cells away and put new ones in

    Will
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    Flashaholic* PhotonAddict's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    I think the Madmax from the Shoppe would do the job. For approx. 600mA to the led you would need the MM+. Draws approx. 1A from the batteries as I recall.

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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Will, if you want the best drain from the cells, it is ideal to use a buck converter and enough cells to stay above Vf, even after they are almost dead. I know that your preference is 2 D.

    Would you consider putting 2 Li enhanced D cells in that light for very long run time ? (yes, I know that is $ 30 worth of cells.)

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    *Flashaholic* IsaacHayes's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Constant current such as BB500 wouldn't be good for draining them completly. Maybe the NG500 would work, as it goes into a safe mode that is like moon mode, but more efficient I've heard.

    If you go for a voltage boost circuit, it may not be exactly flat output as long as a constant current would be, but it will drain the cells down until they are toast. Something like a MadMax would be ideal. There are variations MM+, MM+ WO, not sure which is the best in this case...

    For draining alkalines in emergencys and getting light out of "almost dead" cells a unregulated voltage boost circuit is what you need. A madmax, or even a micropuck HO or 2 micropucks in parallel should be good.

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    *Flashaholic* wquiles's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Cool - it looks like the Madmax is it!

    As I have never used one before, how do you set and/or limit the current in these?

    Will
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    Flashaholic* PhotonAddict's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    As far as I know the MM Lite and MM+ from the Shoppe are "wide open" - they will draw approx. 500mA and 1A respectively from the batteries regardless of the load so that work out to approx. 350mA and 700mA to the leds depending on the forward voltage of the led.

    They are not truly current regulated like the Badboy converters so the current delivered to your leds would depend on how many you have connected and their forward voltage. You can use some small resistors as well to control things. Some use a small resistor with each led to account for the slight variation in Vf (I'm assuming you are connecting them in parallel).

    btw: if you considering the micropuck, here is useful link with application notes that will help get you started:
    http://www.leddynamics.com/LuxDrive/micropuck.php

    Hope that helps.

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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by PhotonAddict
    btw: if you considering the micropuck, here is useful link with application notes that will help get you started:
    http://www.leddynamics.com/LuxDrive/micropuck.php
    That micropuck 2009 is amazing!
    Boost, buck, buck/boost and parallel connection!
    Do someone know what circuit is in there?

  12. #12
    *Flashaholic* wquiles's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by PhotonAddict
    btw: if you considering the micropuck, here is useful link with application notes that will help get you started:
    http://www.leddynamics.com/LuxDrive/micropuck.php
    Hope that helps.
    The micropuck looks great. I went ahead and ordered two of the "high" power version units to test in my setup - thanks

    Will
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by wquiles
    The micropuck looks great. I went ahead and ordered two of the "high" power version units to test in my setup - thanks

    Will
    Hi Will,

    Where did you order the MicroPuck (2009-HI) converters from? Did they have good prices and reasonable service?

    How did the MicroPuck work in your application?
    [ JIL info post here ]

  14. #14
    *Flashaholic* wquiles's Avatar
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    Default Re: Driver for 2D alkalines for about 500-600mA?

    I don't remember from whom, but these guys are probably OK: link

    These drivers worked perfect in my application

    Will
    Last edited by wquiles; 09-04-2006 at 03:40 PM.
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  15. #15

    Default Re: Driver for 2D alkalines for about 500-600mA?

    Dude,

    arcamania had a heap of $5 1/2 cell boost drives... very small..

    I got heaps...very happy...

    I get 500-600ma depening on the cells...

    I made a aray like the one you talk about...using 6/ 16L 8mm white...works well..

    enjoy

    Ktronik

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    Default Re: Driver for 2D alkalines for about 500-600mA?

    Quote Originally Posted by ktronik
    arcamania had a heap of $5 1/2 cell boost drives... very small..
    What are the dimensions of the arcmania $5 boost drive (diameter and height)? I am trying to determine if they would fit in a JIL-CR2 1.3W, in place of the tiny MicroPuck.

    Are the $5 arcmania boost drives the ones that LITEmania is currently selling?

    Thanks!
    [ JIL info post here ]

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