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Thread: HELP how do i

  1. #1
    Join Date
    Apr 2014
    Location
    Auckland NZ
    Posts
    16

    Default HELP how do i

    Hello i got my hands on a bag of little red diodes about 50 of them and want to put all of them in to a board. but have no idea on how to wire them all up. i think there 5mw red, any help would be great ..ThanksClick image for larger version. 

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    This is where i put all the lasers i have..and thats a lot..probably not enough space.

  2. #2
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,478

    Default

    ... wire them in series and drive them with constant current at higher voltage.

    I have a 652nm-module with 60 (!) diodes in series, which needs 400mA and are supported with maybe 180 Volts driving voltage

    My recomendation would be something like 24 or 48 Volts (common PS voltages) and a MOSFET based CC-driver.

    Check the needed voltage per diode, so you can estimate the number in the chain -- e.g. 2,5V per diode and 4 Volts drop at the driver will give:

    24V - 4V = 20V -or- 48V - 4V = 44V max driver voltage

    20V / 2,5V = 8 diodes -or- 44V / 2,5V = 17 diodes in series ...

    Viktor

  3. #3
    Join Date
    Apr 2014
    Location
    Auckland NZ
    Posts
    16

    Default

    Thanks Heeps now to have a go at it. Cheers
    This is where i put all the lasers i have..and thats a lot..probably not enough space.

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