photo transistor circuit

Discussion in 'The Projects Forum' started by harryd, Mar 3, 2010.

  1. harryd

    Thread Starter New Member

    Mar 3, 2010
    1
    0
    hi ,
    i am working on a project and i need some help. well the main idea is to detect red light( from laser pointer) through a photo transistor. anyways, i need a circuit for the transistor and i need to know how to calculate the resistance needed etc...


    thanks in advance
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
    1,153
    304
    We need a little more info:
    What is the part number of the transistor?
    What is the circuit you want to turn on?
    what voltage do you want to use?
    With this info we can probably come up with something...
     
  3. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
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