Change PNP transistor to NPN

Discussion in 'The Projects Forum' started by minh, Jun 18, 2014.

  1. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    Dear All,,
    I would like to change transistors for detect ion positive from this circuit (please see photo) but not working.Could you help me to correct what I wrong please more detail or new other schema is better (I am new in electronic) Thank you so much
     
  2. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    You are supposed to keep the collectors and emitters in the same places, just use the other polarity of transistors, and reverse the voltage of the power supply and the LED while you're changing things.
     
    Last edited: Jun 18, 2014
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  3. crutschow

    Expert

    Mar 14, 2008
    13,028
    3,237
    And you also need to reverse the LED direction.

    Edit: Okay, since you edited your post #12, mine is redundant.
     
    Last edited: Jun 18, 2014
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  4. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    Quick draw!
     
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  5. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    Thank you so much #12 and Crutscfhow for yours time help me . Yours help Very very helpful
    Salut
     
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