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Thread: Lasever offers drivers and lens for 445nm lasers

  1. #31
    Join Date
    Jul 2008
    Location
    Germany, near ESSEN
    Posts
    12

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    Update...
    thanks David :-)

  2. #32
    Join Date
    Feb 2008
    Location
    East Sussex, England
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    5,248

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    Regardless of the driver, if you are running a 445nm diode, you need more than 5v input
    I'm still not getting this.

    I'm running 445's off of flexmod2's in parallel on the 5v supply for my Laserwave green, and I'm running them at ~750mA/600mW no problem whatsoever, and they do go higher...

  3. #33
    Join Date
    Jan 2008
    Location
    Stockholm, Sweden
    Posts
    799

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    Quote Originally Posted by norty303 View Post
    I'm still not getting this.

    I'm running 445's off of flexmod2's in parallel on the 5v supply for my Laserwave green, and I'm running them at ~750mA/600mW no problem whatsoever, and they do go higher...
    You can always go back to the basics and look at the numbers. Though my electronics skills are not the best I'll at least give it a try.

    At 750 mA the forward voltage over the diode is likely around 4.2 V. On top of that you have at least two additional voltage drops in the driver: The current sense resistor and the drive transistor. Suppose the resistor is 1 ohm you'll get a voltage drop of 0.75 V over it at 750 mA (Ohm's law). That means the voltage across the transistor has to be a mere 0.05 V, which is typically too little to work with.

    A driver using a 0.1 ohm current sense resistor will be better off in this situation though.

  4. #34
    Join Date
    Aug 2010
    Location
    Virginia
    Posts
    145

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    Hay is any one going to have a group buy for these drivers.
    I need one but I can only afford a group buy price.
    Lasers
    •405nm violet(blue-ray) laser-eBay I fixed it ya
    •473nm 10mW LSR473NL series blue laser module www.lasever.com review
    •488nm 5mW Novalux Protera DPSS Laboratory Unit
    •532nm 5mW green laser www.elitelasers.com
    •650nm 5mW red

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