Discussion in 'The Projects Forum' started by gofeto, Aug 10, 2012.

  1. gofeto

    Thread Starter New Member

    Aug 6, 2012
    Hi, i need a Laserdriver IC, that converts DC Voltage (maximal input voltage 7V) into current (100-200mA), i was wondering if the LT1121 one good idea is or not, if u have any better suggestion, please share it with me.
    Thanks in advance :)
  2. BMorse

    Senior Member

    Sep 26, 2009
    #12 likes this.
  3. gofeto

    Thread Starter New Member

    Aug 6, 2012
    I can only regulate the current through the voltage, i cant use variable resistor. Nvm, im just stupid, read the all the things in the link, that you gave me, and instead of variable resistance, i added variable voltage, and it worked, many thanks for the help. :)
    Last edited: Aug 11, 2012
  4. chrissyp

    Active Member

    Aug 25, 2008
    no,the laser needs to be current driven from a regulator ie lm317 although the input voltage and output in the above example are a bit close for comfort with an lm317, a better bet would be to use an lm2941 this has a low drop out voltage nominally 0.5v .drive it in the same way as the lm317 example.