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Thread: Audio Modulation on the M140 diode

  1. #1
    Join Date
    May 2013
    Posts
    12

    Question Audio Modulation on the M140 diode

    Hi all.

    Thanks for amazing forum.

    I'm looking to audio (analog) modulate the M140 diode. I have done this with a cheap 5mw laser pointer. This was possible because the drivers output is proportional to the input. So I used a basic transistor circuit and audio from a 3mm jack.

    Now with a more powerfull diode like the M140 I will need a 2A driver with analog modulation capabilities. So I found the FlexMod P3. But they are rare, there is group buy running at the moment.

    This is my first group buy so I'm not sure how long it may take, and I need them very urgently.

    So my questions are:
    1. Is there anyone willing to sell me 2 FlexMods as soon as possible?
    2. What are my alternative options to the FlexMod?
    3. I build a basic constant current driver quite easily before, but can't find any circuit diagrams on a analog driver. Will this be very complex built?

    Thanks for great forum

    Regards

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

    Default

    ... read here: http://www.repairfaq.org/sam/laserdps.htm#dpsldd317

    Can be maxed to much more current with parallel LM-chips too -- I'm driving high power IR-laserdiodes with up to 9Amps through some parallelized LM317 and LM338 ...

    Viktor

  3. #3
    Join Date
    May 2013
    Posts
    12

    Default

    Quote Originally Posted by VDX View Post
    ... read here: http://www.repairfaq.org/sam/laserdps.htm#dpsldd317

    Can be maxed to much more current with parallel LM-chips too -- I'm driving high power IR-laserdiodes with up to 9Amps through some parallelized LM317 and LM338 ...

    Viktor

    Just found this page. I'm so glad! this was exactly what I needed!

    Thanks so much for the reply.

  4. #4
    Join Date
    Oct 2007
    Location
    Vancouver, Canada
    Posts
    327

    Default

    There's also the badpip driver as well if you're looking for a ready made driver. Using them for my latest builds with good results, have always used flexmods in the past.

    http://www.photonlexicon.com/forums/...=badpip+driver

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