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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%
Multiple Choice Poll.
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Thread: FS: Microprocessor controlled drivers

  1. #61
    Flashaholic* StefanFS's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Interested in:
    3 x LiIon with 100% - 25% - 10% - Strobe.
    As it is right now the AA variant is too tall.
    Stefan
    Last edited by StefanFS; 06-08-2007 at 09:11 AM.

  2. #62
    Flashaholic joedm's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by RV7 View Post
    Looks like I'll have to program a few boards with strobe to keep you happy. Do you want the AA or 3.7V version?
    Thanks RV7!!! What a pal!!!
    I'm interested in both the AA and the 3.7V versions, however if I had to choose I would go with the 3.7V (3 modes + strobe). I'd prefer a fast strobe if there's only one choice rather than a slow strobe.

  3. #63
    Enlightened
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    Default Re: Microprocessor controlled 4-mode driver boards

    Ohh this looks good.
    I am/was about to make a Madmax WO+ sandwich for my miniminimag and run a 3volt Lithium AA but I'm guessing these will make it brighter and more useful running off 1.7 volt lithium AAs (or can the AA boards take 3volt?) or am I wrong in my thinking.
    Either way I'll have a couple of AAs one with strobe and one without.

    Eryk

  4. #64
    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!

  5. #65
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by Artisan Bill View Post
    Hi RV7,

    I have been looking for a 1AA board with variable output for quite some time. I congratulate you for making such a driver.

    I would be in for 3 to 5 AA and 3.7V boards with mode A. I would most likely be interested in the 18x7mm 3.7V boards.

    Sounds like this will be a fantastic product

    Regards, Artisan Bill
    Thank you! Hope you'll like it.
    RV7

  6. #66
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Eryk,

    3V is too much for the AA driver and unnecessary. With a freshly charged good NiMH and - though this requires a little luck - a low Vf Cree , you can get 900mA at the LED, which will make your little AA brighter than a lot of 18650 lights. Of course your AA will get "HOT" quickly.

    With all the Crees I've tried, I get at least 750mA. The efficacy of this AA board is about 70% (without considering the power wasted inside the battery). Considering the output level and the fact that it's a step-up circuit, it's a pretty respectable figure I believe! As the battery level goes down, output goes down too but the efficiency gets better.
    Last edited by RV7; 06-07-2007 at 05:50 PM.

  7. #67
    Enlightened
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by RV7 View Post
    Eryk,
    you can get 900mA at the LED, which will make your little AA brighter than a lot of 18650 lights. Of course your AA will get "HOT" quickly.
    I'd probably be only using high for the factor and those 'call that a light' times. I hope it does the same off the lithiums as I'm not into rechargables alot mainly due to the fact I forget to recharge them.
    As for the heat I find it a useful reminder that your light is on when it's in your pocket.

    Eryk

  8. #68
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    These boards sound great and my vote is to keep the strobe.

    If you ever make 3.7V in 13.9mm diameter to fit ECans I would jump at some.



    Colin.

  9. #69
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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

  10. #70
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by Ganp View Post
    These boards sound great and my vote is to keep the strobe.

    If you ever make 3.7V in 13.9mm diameter to fit ECans I would jump at some.



    Colin.
    Colin, maybe you can get only the PWM module, which happens to be 14mm diameter x 2.2mm tall, and connect it to your current driver. For most situations where LED- is connected to battery-, the PWM can fit easily in between by a straight forward wiring.

    The PWM module can be ordered separately for $8 each and shipped by lettermail!


  11. #71
    Flashaholic
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by RV7 View Post
    Colin, maybe you can get only the PWM module, which happens to be 14mm diameter x 2.2mm tall, and connect it to your current driver. For most situations where LED- is connected to battery-, the PWM can fit easily in between by a straight forward wiring.

    The PWM module can be ordered separately for $8 each and shipped by lettermail!
    Hi RV7 .... Thanks for that idea but with my rubbish soldering skills I need a driver with as little to do as possible

    Also the cost of doing it this way would be about the same as useing Flupics or Piglets, which I favour for my own lights, but are a little too bothersome for some non flashaholic users.

    I'll keep watching though, just in case you do some later



    Colin.

  12. #72
    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!

  13. #73
    Flashaholic* Erasmus's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by RV7 View Post
    Eryk,

    3V is too much for the AA driver and unnecessary. With a freshly charged good NiMH and - though this requires a little luck - a low Vf Cree , you can get 900mA at the LED, which will make your little AA brighter than a lot of 18650 lights. Of course your AA will get "HOT" quickly.

    With all the Crees I've tried, I get at least 750mA. The efficacy of this AA board is about 70% (without considering the power wasted inside the battery). Considering the output level and the fact that it's a step-up circuit, it's a pretty respectable figure I believe! As the battery level goes down, output goes down too but the efficiency gets better.
    Nice output for only one NiMH cell! However, if the LED is driven at 750mA (at least 2.5W) and the efficiency is 70%, the input power is at least 3.5W so the driver produces 1W of heat. Should the driver be heatsinked?

  14. #74
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by Erasmus View Post
    Nice output for only one NiMH cell! However, if the LED is driven at 750mA (at least 2.5W) and the efficiency is 70%, the input power is at least 3.5W so the driver produces 1W of heat. Should the driver be heatsinked?
    It's not necessary because:
    - The components on the driver board disperse heat much better than the LED die itself does
    - The components can withstand much higher temperature than the LED
    - The LED is still the major source of heat

  15. #75

    Default Re: Microprocessor controlled 4-mode driver boards

    I think you had written something about the driver being able to remember which mode it was last in before being switched off such that when you turn it back on it will be in the same mode.

    I had assumed that you had to cycle through each time, can you talk a little more about the on/off & cycle process?

  16. #76

    Default Re: Microprocessor controlled 4-mode driver boards

    I would like several of each, 5 3.7 and 3 1AA
    Please PM when ready, I may not recheck the thread.
    Thanks!
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  17. #77
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Nine, please refer to Edit#2 in the first post. If you leave the light on for two seconds or more, the mode will be remembered so that the next time you turn it on it will stay in the same mode.

  18. #78
    Flashaholic*
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    Default Re: Microprocessor controlled 4-mode driver boards

    Wow, great progress !!!
    I do have several more questions:

    1) How much is the current-draw from the 1AA NiMH board ? (100/70 x750mA ?)
    2) Can I also offer the 1AA NiMH board in 350mA version (or swap resistor ?)
    3) You said: "Safe to use with unprotected batteries". Please explain
    how the this works, or what happens.
    4) What does the "14mm diameter x 2.2mm tall PWM only" board do ?

    Thanks for everything !
    BTW: Interested in at least 4 boards. Answers will determine my final choice...
    Cheers !

  19. #79
    Flashaholic* kevinm's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Very nice, very nice! I was wanting to build a light that could use RCR123's and R123 primaries, so probably 3.0V. Will that be an option as well? if not, how will the 3.7V board work with a 3.0V battery?

    Thanks,
    Kevin
    Last edited by kevinm; 06-10-2007 at 08:12 PM.

  20. #80
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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)

  21. #81
    Unenlightened
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    Default Re: Microprocessor controlled 4-mode driver boards

    I would be very much interested in both one AA-no strobe driver and one 3,7v Li-ion no-strobe driver!

    Great project! I've been searching for "affordable" drivers like these for a long period..

  22. #82
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Quote Originally Posted by bombelman View Post
    Wow, great progress !!!
    I do have several more questions:

    1) How much is the current-draw from the 1AA NiMH board ? (100/70 x750mA ?)
    2) Can I also offer the 1AA NiMH board in 350mA version (or swap resistor ?)
    3) You said: "Safe to use with unprotected batteries". Please explain
    how the this works, or what happens.
    4) What does the "14mm diameter x 2.2mm tall PWM only" board do ?

    Thanks for everything !
    BTW: Interested in at least 4 boards. Answers will determine my final choice...
    Cheers !
    Answers:

    1. Current and voltage at both LED and battery (measured under load) are used to calculate efficiency. The answer is 3A. Incredible? Don't worry, almost all NiMH can handle this, although I do recommend higher capacity ones (>2000mAH). Since this is a multi-mode driver, you can pick a mode you and your light are comfortable with. When some bully shoot his big torch at you, thinking you're just holding a little toy, switch to high mode and blind him!

    2. The AA design is to achieve high output while maintaining good efficiency, and that's what differentiate this board from the crowd of 300mA ones. Don't forget it's multi-mode.

    3. A Li Ion battery is considered over discharged when its voltage drops below 2.8V. The driver virtually stops at around 3.1V so it won't over discharge the battery.

    4. It's the processor unit and the MOSFET gate, which can be used to control drivers.

  23. #83
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Kevin, unfortunately the 3.7V board won't work with 3.0V batteries.

  24. #84
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Yellow, most people voted for "remember last setting". When this sale is over and you're happy with your testing results, probably I'll program a few without the memory feature for you.

  25. #85
    Flashaholic* kevinm's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Drat! Okay, PM incoming...

  26. #86

    Default Re: Microprocessor controlled 4-mode driver boards

    I would also be interested in a memory-less w/strobe, start on Hi, ver.
    I still haven't seen a price but may like a cpl.

    ThanX
    X..
    So much to learn, so little time.. ')
    DFW Texas Spring Fling CPF and LPF Flashapalooza, TBA? ')

  27. #87
    Flashaholic* Erasmus's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Some questions :
    1. Will there also be a 2AA NiMH board available?
    2. How does the switching between modes work?
    3. The PWM module will work with all kind of drivers, like for example the MillerMods 2AA NiMH 700mA driver?

  28. #88
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    Default Re: Microprocessor controlled 4-mode driver boards

    That would be my preference as well, too bad there won't be any in the first batch. I'm still very interested in seeing how it turns out though. Like Erasmus, I'm also interested in hearing more about the PWM module as well as hoping for a 2AA version eventually.

    Quote Originally Posted by X_Marine View Post
    I would also be interested in a memory-less w/strobe, start on Hi, ver.
    I still haven't seen a price but may like a cpl.

    ThanX
    X..

  29. #89
    Flashaholic RV7's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    Answers to inquiries above:
    -Mode switching is explained in Edit #2 in the first post. Basically it's like the Rexlight logic, except that the hated 5 second wait is reduced to 2 seconds.
    -When time allows, I'll work on a 2aa/3.0v driver.
    -The PWM module provides a MOSFET switch that's controlled by a processor which can be programmed. If that means little to you, then I would not recommend you to buy it separately. I haven't seen a MillerMods driver yet so can't say for sure. But theoretically the module works with most drivers.

  30. #90
    Flashaholic joedm's Avatar
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    Default Re: Microprocessor controlled 4-mode driver boards

    questions about the strobe..
    what output level will the strobe function at or does this not matter?
    And whats the runtime based on the strobe and a 14500/AA?

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