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View Poll Results: Which board would you like?

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  • 1AA NiMH with strobe

    33 16.10%
  • 1AA NiMH without strobe

    75 36.59%
  • 3.7V Li-Ion with strobe

    63 30.73%
  • 3.7V Li-Ion without strobe

    78 38.05%
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Thread: FS: Microprocessor controlled drivers

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  1. #1
    Flashaholic RV7's Avatar
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    Default FS: Microprocessor controlled drivers

    These drivers focus on performance. The PWM frequency is over 5KHz so there's absolutely no noticeable flickering. The microprocessor uses "on" time to control mode switching - if you turn it off within 2 seconds since you turned it on, then it will be in the next mode when you turn it on again. If you leave it on for more than 2 seconds, then the next time you turn it on it will stay in the same mode (last mode memory).

    1AA NiMH

    Size: 16x6.5mm (L1P size); Diameter can be trimmed down to 14.5mm
    Efficiency: >80%
    Full output: 800mA
    Reverse polarity won't fry the board nor the LED. But there's a current draw. So if you've just changed battery and find the light not working, turn it off and check the battery polarity.
    Price: tbd
    Modes:
    a) 4% - 20% - 100% (no strobe)
    b) 4% - 20% - 100% - 10Hz Strobe

    3.7V Li Ion

    Size: 18x7mm
    Efficiency: ~95%
    Full output: 1A until 90% discharge with a typical Cree and 18650; then gradually goes down until 98% discharge, when output will drop below 2mA and the battery voltage is around 3.1V. Safe to use with unprotected batteries. Full output level can be changed by replacing a resistor on the board.

    Reverse polarity protection
    Price: tbd
    Modes:
    a) 1% - 7% - 30% - 100% (no strobe)
    b) 1% - 7% - 30% - 100% - 10Hz Strobe


    -- 1AA Beam Shots ----------------------------
    I modified a DX Elite (Elly with Cree) using one of my boards. Here are some comparison beamshots. The Rex2.0 has the whitest tint and the best beam pattern, while both the Elite and the MK2X are yellowish. Probably due to the difference in tints, in the photo the Rex appears brighter but to my eyes it's the contrary. After 10 minutes on high, Rex got hot but the Elite was just warm, supposedly due to its bigger size.





    -- 1AA driver beta batch - July 20 --------------------------------------------------------
    Some 1AA boards have been assembled. In 100% mode the board outputs 750mA at an efficiency of 81%. If you use a good switch and a Q2 Cree, don't be surprised to see 1A at the LED at 77% efficiency. StefanFS gets more than 1A with a 18650 sized NiMH. It can light up at 0.75V and outputs 70mA at 86% efficiency. With a 2300mAH battery the runtime (to 50%) is about 40 minutes in 100% mode and 4.5 hours in 15%. I believe this driver is taking the power and efficiency of 1AA booster to a new level. Now you get Li Ion performance with NiMH! Vive la NiMH!

    Areas to improve: Compensation needed for the nonlinear relation between PWM percentage and actual output percentage (see beamshots below); efficiency in lower modes can be better; the size can be smaller (15x6.5mm). A friend of mine and I are working on these and will come up with an improved version in a couple months. But I'd like to keep this a hobby and thus can't promise a delivery date.

    For those who have been waiting and are interested in trying out the current version, I'm offering a limited quantity at $8 each. No more of this version will be made.
    Update: The beta batch was sold out on Aug 2.
    Last edited by RV7; 10-11-2007 at 05:37 AM.

  2. #2
    Flashaholic* Erasmus's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Definitely interested if it fits into a Fenix L2P! Right now running a MillerMods custom driver board 700mA output 2 NiMH cell input. I want to install an other driver board with mulitple modes, so yours looks very interesting. Is it also possible to get a low-low like 2-3%? Any idea about the price?
    Last edited by Erasmus; 06-03-2007 at 09:27 AM. Reason: typo

  3. #3
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by Erasmus View Post
    Definitely interested if it fits into a Fenix L2P! Right now running a MillerMods custom driver board 700mA output 2 NiMH cell input. I want to install an other driver board with mulitple modes, so yours looks very interesting. Is it also possible to get a low-low like 2-3%? Any idea about the price?
    Glad to hear that.

    Theoretically a low of 2-3% is possible. Let's see how many ppl like that kind of low. I don't have a 2AA board yet. But if you have the savvy, you can get only the control board and integrate it with your MillerMods driver.

    The cost hasn't been finalized yet. Should be around $10.

  4. #4
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    definately interested!

  5. #5
    Flashaholic HiltiHome's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    I'm interested, if it goes like this:

    low,med,high (no strobe), or
    low-low,low,med, high

  6. #6

    Default Re: Microprocessor controlled 4-mode driver boards

    For ~$10 i'm in!

  7. #7
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    Default

    easy: I am one of the guys present here, who actually use their lights on the job, often and in normal "flashlight chores".
    Dont want to burn my eyes every time I switch the light on, so if it starts in another as the low setting
    --> not interested

    modes better should be:
    low level ~ 2-5 %, med 40-55 %,

    or (an outcome of the Fenix asking tread): skip the strobe and make 4 levels like:
    very low, low-med, med-high, full. (2-5, 30, 60, 100 %)

    if the modes are low to high or high to low, You might decide later

  8. #8

    Default Re: Microprocessor controlled 4-mode driver boards

    I am interested depending on price.

  9. #9

    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by davenlei View Post
    I am interested depending on price.
    so am i

  10. #10
    Flashaholic* StefanFS's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    I'd be interested in a few (3-5) if you keep the stated levels in your specififation. I like my lights to come on at 100%. It's not that hard to block the lens with a finger etc. and tap the switch quick one or two times if I want lower output!
    Is it possible to change current to the led up or down with resistors or some other way?
    Stefan

  11. #11
    Flashaholic* ledaholic's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    I'm interested

    Interested in both the AA and Li-Ion 95% efficient boards with strobe.
    Thanks, Bob
    Last edited by ledaholic; 06-06-2007 at 01:06 PM.

  12. #12
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    Yellow described it exactly as I would like it. I couldn't say it any better. I would be very interested if you kept it simple, efficient, and a nice low option.

    Quote Originally Posted by yellow View Post
    easy: I am one of the guys present here, who actually use their lights on the job, often and in normal "flashlight chores".
    Dont want to burn my eyes every time I switch the light on, so if it starts in another as the low setting
    --> not interested

    modes better should be:
    low level ~ 2-5 %, med 40-55 %,

    or (an outcome of the Fenix asking tread): skip the strobe and make 4 levels like:
    very low, low-med, med-high, full. (2-5, 30, 60, 100 %)

    if the modes are low to high or high to low, You might decide later

  13. #13
    Flashaholic* matrixshaman's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Interested. Unlike the simpletons and KISS crowd I like strobe but will be interesed either way.
    There is no important work, there are only a series of moments to demonstrate your mastery and impeccability. Quote from Almine

  14. #14
    Flashaholic*
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    Default

    if low,med,high,strobe (or better lowlow, low, med, high)
    and final price about Your 10,--

    at least a few (5) for Li-Ion
    gotta think about the 2AA

  15. #15
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    I would be interested in the 1 x AA board. I am not aware of an existing solution with specs this good.

  16. #16

    Default Re: Microprocessor controlled 4-mode driver boards

    i would be interested in a 1xaa and possibly the 3.7 one too.

    thanks

  17. #17
    Flashaholic* cryhavok's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    definitely in for some of the Li-ion boards!

  18. #18
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    New modes can be found on the first post. Also please post your preferences as to how the mode switching should work. I'm reading!

    From now on, I'll edit the first post to show updates to the design.

  19. #19
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    From what I've read in a bunch of threads, a lot of people want a light that comes back on in the stage you left it at. I'm definitely one of those people, so I vote for no default.

  20. #20
    Flashaholic joedm's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    what a shame that you've given up on the strobe. This would've been really useful to modify my current lights so that I could use them as strobe while riding my bike.

    Oh well.. I'll keep checking in case you decide to include it again.

  21. #21
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    Please keep the original modes (100% - 25% - 10% - Strobe)
    They are perfect.
    sskyy

  22. #22
    Flashaholic*
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    Default Re: Microprocessor controlled 4-mode driver boards

    Interested even though those are mighty tall drivers for modding smaller sized flashlights???? But yet, So when the Q & A ends and there is a product to be had............. Paypal is impatiently waiting to be sent! I mean patiently waiting, of course!


    Thanks
    Ken
    Last edited by kenster; 06-05-2007 at 05:17 AM.

  23. #23
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Ken, that's quite encouraging. Thanks!

    Now I almost feel obligated

  24. #24

    Default Re: Microprocessor controlled 4-mode driver boards

    Rv7,

    Ok, so the 3.7 version will run at 2.5-4.2v. If I apply a little too much voltage (4.5-4.7v) will it just go out of regulation until it reaches 4.2v and then pop back into regulation? Or will it just fry the board?
    Also, will you offer different outputs of the board like a 1.1a output version?

  25. #25
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by davenlei View Post
    Rv7,

    Ok, so the 3.7 version will run at 2.5-4.2v. If I apply a little too much voltage (4.5-4.7v) will it just go out of regulation until it reaches 4.2v and then pop back into regulation? Or will it just fry the board?
    Also, will you offer different outputs of the board like a 1.1a output version?
    I tried 8V and it got warm, which is an indication of poor efficiency, but didn't fry. The output is still very well regulated. It's recommended to use the board with a single 3.7 batt, when it's the most efficient.

    The driver, thus max output, can't be configured. Only the PWM can be programmed.
    Last edited by RV7; 06-05-2007 at 12:00 PM.

  26. #26
    Flashaholic*
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by RV7 View Post
    Ken, that's quite encouraging. Thanks!

    Now I almost feel obligated
    If you need someone to try out some drivers, I will buy whatever you have!

    Ken

  27. #27
    Flashaholic* FirstDsent's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    I'm in for 3. 3.7V mode A. Sounds sweet. If I start making lights again, I'll buy a lot.

    Bernie
    If it's worth driving, it's worth overdriving!

  28. #28
    Flashaholic*
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    Default

    gotta update my early post:

    still 5 boards, but
    3 for Li-Ion
    2 for 1 AA
    all mode a) (low to high, no strobe)

    Sorry for the change, Thanks for the offer

  29. #29
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by yellow View Post
    gotta update my early post:

    still 5 boards, but
    3 for Li-Ion
    2 for 1 AA
    all mode a) (low to high, no strobe)

    Sorry for the change, Thanks for the offer
    Thanks for your ideas and updates!

  30. #30
    Flashaholic*
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    Default

    would not like to get "remember last setting"
    this will lead to full blast when low is needed (and excepted)

    If we can change this (by soldering a resitor onto the capacitor that does this, or something similar), still interested.
    If not just 1 Li-ion board for testing purposes (by now)

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