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Discussion in 'General Electronics Discussion' started by Mattblack, May 8, 2015.

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  1. Mattblack

    Mattblack

    4
    0
    May 7, 2015
    Please can someone explain why this wont work :(
     

    Attached Files:

  2. jarvis2.0

    jarvis2.0

    10
    0
    Apr 29, 2015
    can you specify how much current the led can handle?
     
  3. Mattblack

    Mattblack

    4
    0
    May 7, 2015
    5v
     
  4. davenn

    davenn Moderator

    13,812
    1,945
    Sep 5, 2009
    QUOTE="jarvis2.0, post: 1650457, member: 39807"]can you specify how much current the led can handle?[/QUOTE]

    5V isn't current
    if it is a standard LED it will be rated at ~ 20mA
    the 1k resistor would be OK for a start with the LED
    make sure the LED is the correct way round

    how about labelling your parts ... particularly the transistor type

    first major fault is that you have the +9V bypassing the resistor and LDR and going straight to the base of the transistor
    you may well have damaged the transistor
    remove that jumper off the top of the resistor and place it between the transistor base and the connection point between the resistor and the LDR

    Dave
     
  5. Mattblack

    Mattblack

    4
    0
    May 7, 2015
    Awesome thank you!
     
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