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Thread: Driver Recommendation

  1. #1

    Default Driver Recommendation

    I'm looking at ordering a 12x SO6J 405nm Diode, but I need a TTL driver suggestion. I reached out to Jordan at DTR but he had no recommendations. Can anyone offer any help?

  2. #2
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    Ebay is full of them. One thing is for sure though, get a Lasorb on that thing. I have not met a 405nm yet that hasn't died. I suspect the lack of a Lasorb is probably what did them in. Small transients in current/voltage, possibly ESD... who knows? Anyway, with a Lasorb, I am pretty sure any cheap driver on ebay would suffice.

    e.g.
    http://www.ebay.com/itm/Industrial-4...Hh5FSPkqd5j8qQ

  3. #3
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    This is what I use with my S06J.

    http://www.ebay.com/itm/2A-TTL-Laser...3D142129451698

    I can't make any claims on reliability or durability yet though as it doesn't have much time on it yet. It was cheap and easy though which was all I was after. The shipping time was pretty bad though but I don't think it was the sellers fault. Mine seemed to have gotten held up in customs.

    Here is another option with more features. I have one of his older, multi-channel drivers in my RGB projector that has worked flawlessly for over 2 years. I haven't tried this particular driver though.

    http://www.ebay.com/itm/3A-analog-li...kAAOSwUEVYCzO0

    If you want really cheap then there's these.

    http://www.aixiz.com/store/product_i...roducts_id/103

    I use these in my single mode laser pointers. They're a great deal.
    Last edited by ZeroPoint; 02-14-2017 at 04:32.
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
    1x Lightspace Color Ray Series 6W RGB
    2x Lightspace Venus 2W RGB

    ZPL Lighting www.zpllighting.com

  4. #4
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    Quote Originally Posted by ZeroPoint View Post
    Here is another option with more features. I have one of his older, multi-channel drivers in my RGB projector that has worked flawlessly for over 2 years. I haven't tried this particular driver though.

    http://www.ebay.com/itm/3A-analog-li...kAAOSwUEVYCzO0
    I have about 50 of these drivers and they are my favorite driver including for running 405nm diodes.

    Also, +1 for Absolom's advice. I've blown several 405nm diodes while running them for long periods of time. Inadequate cooling and back-reflection off of PBS cubes are my current suspects, but you can't go wrong with adding a Lasorb.

    -David
    "Help, help, I'm being repressed!"

  5. #5
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    @dkumpula, do you know if he still sells any multi-channel drivers? I only see two single channel options on his eBay store. Do you know if he has discontinued the other models?
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
    1x Lightspace Color Ray Series 6W RGB
    2x Lightspace Venus 2W RGB

    ZPL Lighting www.zpllighting.com

  6. #6
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    Drop him a message, that's BBE on PL. Vladimir.
    http://www.facebook.com/SubsonicSystems
    http://www.frikkinlazors.co.uk

    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  7. #7
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    @James211, I just came across your other post about engraving. While I don't have any experience with engravers I just wanted to point out that you don't need to get hung up on the defference between TTL and Analog for your driver. One of the drivers I recommended (which might be the best option for you after seeing your intended purpose) is actually an analog driver. An anolog driver is generally superior to TTL drivers and can function just as easily as a TTL driver, but TTLL cannot function as analog.

    For clarification, TTL simply indicates that the driver only responds to a logic 1 or 0 (the laser can either be 100% on or off, there's no in between). An analog driver can modulate the laser output from 0-100% or anywhere in between. This characteristic is important from a visual aspect because it offers a wide range of color blending that a projector can produce. For your application, however, it's possible that either the engraver or the software (I don't know how it all works) could not take advantage of the analog benefits. The analog driver would still work just fine though and you would probably still get better results from a quality analog driver than you would from a cheap TTL driver. I guess that's a matter of modulation frequency though and I don't know your requirements are there.
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
    1x Lightspace Color Ray Series 6W RGB
    2x Lightspace Venus 2W RGB

    ZPL Lighting www.zpllighting.com

  8. #8
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    Thanks Norty. I remembered his name was something along those lines but I kept thinking MME for some reason.
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
    1x Lightspace Color Ray Series 6W RGB
    2x Lightspace Venus 2W RGB

    ZPL Lighting www.zpllighting.com

  9. #9
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    ... I'm actually redoing my high power driver for diodes with needed currents of 1,6A (2W@445nm-diodes) to 9A (9W@975nm-diodes).

    This is the new "intelligent" module with abilities to react to all types of inputs and driving in TTL or analog modes - I'm driving them mostly TTL but with variable pulse/pause-ratios, so per TTL adjustable "effective" powers from 0% to 100% (pulsing to CW):

    Lasermodul V7_kl.jpg


    - attached the measured pulse forms (measured across a 100 Milliohm shunt resistor = 10 microseconds pulse, 60 microseconds pause) for 1.6A, 4A, 5.7A and 8A - above 5.7A there's some sort of resonant breakdown, what's the next task to tackle it down ...

    Viktor
    Attached Images Attached Images

  10. #10
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    ... solved the "resonant breakdown" - it's related to the relation of supporting voltage for the OPamp and the drawn current.

    Here a DSO snapshot showing 25Ás-pulses with 12Amps (1,2Volts across the 0,1 Ohm shunt resistor) ... the pulse-time could be longer (up to CW) ... and the current could be up to 40Amps (limited by the actual PS), but then the MOSFET's went too hot for the small coolers actually attached:

    12A_25us.jpg


    Viktor

  11. #11
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    very interested on a schematic, parts list, advise or anything in this direction
    "its called character briggs..."

  12. #12
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    ... sorry can't disclose this version, as I'm integrating them in our comercially distributed machines and upgrade modules.

    But I'll search for my older high current driver for IR-diodes with stepwise adjustable currents of 0,5A to 9A -- I've built it with several parallel LM317 and LM338 chips, used as constant current drivers ... and upload the shematics and layout here later.

    I'ts the driver, I've posted here, under point "4. power-source:"
    http://reprap.org/wiki/Laser_Cutter

    Viktor

  13. #13
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    ... OK, found the older 5xLM317-driver and attached the PDF-files of schematic and layout.

    The left top socket is the voltage input - this should be something above 7 Volts and with the needed current.

    The left bottom socket is for the TTL modulation - I've used this driver with up to 30kHz, but with faster opto-couplers (e.g. 6N137) this should be running with up to 1MHz.

    The right socket is the ouptut for the laserdiode.

    I've defined every LM317 for max. 1A in CW-mode (they can drive up to 3-4A when pulsed with low duty ratios) ... replaced them with LM338 for up to 2.5A each in CW mode (5-6A pulsed).

    The current per LM-chip is set with the first resisitors - 1,2 Ohm for around 1A, so 0,6 Ohm for 2A or other values for other predefined currents.

    The output current is defined by jumpers to set the amount (or type, when different current sets per LM-Chip) of LM-drivers ... made this for some drivers with switches for easier changing of the max. current ... or could be done with relays per software too.

    The "effective" engraving power is defined by the pulse-ratio and moving speed.

    The "coupling"/"averaging" resistors with 0,22 Ohms can be omitted (replace them with wire), they were "remnants" from another project, but aren't needed for this constant current setup ...

    Viktor
    Attached Files Attached Files
    Last edited by VDX; 02-18-2017 at 11:44.

  14. #14
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    thanks a lot for sharing! much appreciated

    take a look at this chip too. can take higher currents http://cds.linear.com/docs/en/datasheet/108345fh.pdf

    Last edited by LaNeK779; 02-18-2017 at 12:14.
    "its called character briggs..."

  15. #15
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    ... yes, I've tested with the LT1083 too, but then changed to "paired" MOSFET's with up to 20 Amps in CW mode and tested with 40Amps pulsing (max. output of my 10A-PS).

    The MOSFET's are specified with up to 160 Amps CW and 650(!) Amps pulsing with low duty ratio, if not exceeding 200 Watts thermal -- so there's some "reserve", if needed more power

    On the other hand - if I'll need more power, then it seems to be better, use lower Amperage per chip and wire more chips in parallel ... have some comercial drivers for pumping diodes with pretty high driving power in the kW-ranges, where too several MOSFET's were combined to serial (higher voltages with up to 160 Volts) and parallel (higher currents) groups ...

    Viktor

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