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Thread: Dual drivers, and new revision quad drivers in stock

  1. #11
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    Thanks guys, I'm glad you like them

    /Thomas

  2. #12
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    Can the two be cascaded?
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  3. #13
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    Quote Originally Posted by RDTech View Post
    Can the two be cascaded?
    I'm not sure what you mean by cascaded.

    If you mean running all channels from a single modulation signal, then yes

    /Thomas

  4. #14
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    I am guessing he wondered if you could double the amperage to one diode, by cascading them. To push more current. Guessing he needs a driver capable of more current than these provide individually.
    leading in trailing technology

  5. #15
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    Oh, well in that case yes - that's possible too

    /Thomas

  6. #16
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    Do you just run them in parellel to double current and tie the modulation inputs together? Cascading implies serial and that I am sure will not work.

  7. #17
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    Quote Originally Posted by kecked View Post
    Do you just run them in parellel to double current and tie the modulation inputs together? Cascading implies serial and that I am sure will not work.
    Yes, just a matter of adjusting each channel for 1/2 or 1/4 of the required total current, and then connecting the outputs in parallel.

    I read the cascading as serial as well, that's why I was in doubt what was meant

    /Thomas

  8. #18
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    Jun 2011
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    My quad and dual drivers showed up today!!! YEA!!!!

  9. #19
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    Feb 2011
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    I have some of the dual as well as the quads and while adjusting one for some Mitsu diodes and another for some 445 diodes I realized I didn't REALLY understand the gain vs bias. These diodes each have a threshold current and this is easy to measure, however in analog mode when software drives the color from 0% to 100% I would think you would want 10% laser output at 0.5V modulation input and 60% output at 3V and so on. However the laser first switched "on" at aprox. 0.3V and the output was not linear with modulation input. It wasn't very close. What is the optimal set up for bias vs. threshold and gain vs. modulation input?

  10. #20
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    Beam suppression is active when the mod input is below ~0.2V. (+-5%).

    This threshold was chosen because most DACs won't go all the way down to 0V.

    Above this threshold, the driver will "jump" to the bias current.

    Bias sets the "zero" current to the point where the diode starts lasing.

    Gain controls the amount of current per volt on the modulation input.

    So, output = bias + Vmod x gain.

    /Thomas

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