Error in : The transistor as a switch

Discussion in 'Feedback and Suggestions' started by Unregistered, Aug 10, 2009.

  1. Unregistered

    Thread Starter Guest

    The figures on the page:

    http://www.allaboutcircuits.com/vol_3/chpt_4/2.html

    illustrating use of a transistor as a switch are labeled incorrectly. The labels are:

    (a) mechanical switch, (b) PNP transistor switch, (c) NPN transistor switch.

    They Should be

    (a) mechanical switch, (b) NPN transistor switch , (c) PNP transistor switch

    Also, the battery should be reversed in case of the PNP transistor switch illustration, to maintain correct perception of comparison.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    If you are talking about this drawing...

    [​IMG]

    (a) mechanical switch, (b) PNP transistor switch, (c) NPN transistor switch.

    I have to agree entirely.

    For figure C I would switch battery polarity, and match it to (b)
     
  3. Dcrunkilton

    E-book Co-ordinator

    Jul 31, 2004
    416
    11
    [​IMG]
    (a) mechanical switch, (b) NPN transistor switch, (c) PNP transistor switch.

    I swapped NPN and PNP at (b) and (c) above as suggested. Since the PNP at (c) is drawn upside down the battery polarity is correct as is; the collector is (-) battery.

    copy at ibiblio is updated.
     
    Last edited: Aug 25, 2009
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