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Thread: laser diode driver

  1. #1
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    Default laser diode driver

    can any one help
    i am looking for a laser diode driver ciruit or complete module
    it must have ttl modulation and be adjustable up to 300ma or close to as possible dosnt matter if its a bit more than 300 ma i want to drive a hi power dvd burner diode
    thanks
    chris green

  2. #2
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    Default driver

    I have been in the hobby less than 3 weeks. I'm currently building my first driver using the die4drive pcb from Robin Bowden. If you can handle the smd's then go for it.

    Regards - Dave
    Last edited by 450nm; 09-15-2007 at 11:27.

  3. #3
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    Default

    Indeed... Robin da man:

    http://www.die4laser.com/dvd-rec/Die4Drive.htm

    He can supply either a bare board, or fully assembled and tested.

  4. #4
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    Default

    Some hints on the die4drive boards... several of the components can be obtained for free by asking for samples from component vendors. I built a couple and got the diodes and opamps for free.

  5. #5
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    Default die4drive

    thanks guys it looks just what i want i have emailed him so i can buy one
    looked at the web site and every thing about that driver ,theres a pot to set the drive current but how do you set the output voltage for the laser diode that i want to use? can anyone help
    thanks
    chris

  6. #6
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    Default

    You don't set the voltage. You set the current.

  7. #7
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    Default voltage

    hi
    i know you have to set the current i have a diode that requires 2.9 volt@ 200ma so if it got 5volts going into the driver how do you get 2.9v out?
    thanks

  8. #8
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    Default

    This is the Farnell parts list. It worked out cheaper to buy enough components for 2 drivers.

    BOM with Farnell part numbers

    1 818-7622 LMV116MF OP-Amp U1
    2 9843612 BAV-99 D1,D2
    2 933-2383 1k 0805 Resistor R10,R11
    2 718-520 470pF 0805 Capacitor C1,C2
    1 1086793 100nF 0805 Capacitor C4
    1 933-2499 1k2 0805 Resistor R5
    1 933-2944 2k7 0805 Resistor R4
    2 933-2391 10k 0805 Resistor R7
    1 933-3258 470R 0805 Resistor R8
    1 933-2820 22k 0805 Resistor R3
    1 933-2375 100R 0805 Resistor R9
    1 8660158 IRLR3105PBF Mosfet Q1
    2 * 514755 1k Bourns 3314J Pot R1,R2
    1 113-5202 150u 10V 50mR TPS Tant C3
    1 923-9669 1R PRC201 Resistor 1% R12

    * Value dropped from 10k to 1k for better adjustment linearity.
    If you need 10k input impedance use the 10k POT.
    10k Bourns 3314J POT is part no 514779
    A lovely childhood. Just me my mother and the voices.

  9. #9
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    Default

    You can't set both current and voltage because one will dictate the other.

    V= I * R or I = V / R

    With laser diodes you don't worry so much about voltage other than making make sure your P/S is capable of supplying enough.



    Quote Originally Posted by badger1666 View Post
    hi
    i know you have to set the current i have a diode that requires 2.9 volt@ 200ma so if it got 5volts going into the driver how do you get 2.9v out?
    thanks

  10. #10
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    Default

    Well I got all of the bits for the die4drive today. Took me just 4 hours to put it together and it worked a treat.

    Just need a decent diode now.
    A lovely childhood. Just me my mother and the voices.

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