Is an always ON npn transistor bad design?

Discussion in 'General Electronics Chat' started by tpny, Dec 9, 2012.

  1. tpny

    Thread Starter Member

    May 6, 2012
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    0
    If my npn is always turned ON (fully ON) and only occassionally turned OFF (by pushbutton), is that a bad design?
     
  2. #12

    Expert

    Nov 30, 2010
    16,257
    6,757
    No.
    .......
     
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  3. WBahn

    Moderator

    Mar 31, 2012
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    Not inherently. Depending on the goal of the circuit, it may even be the best way to achieve something. But, it may also be a poor way. For instance, another approach my reduce average power consumption. Again, it depends on what you are trying to do and what aspects are more important than others.
     
  4. absf

    Senior Member

    Dec 29, 2010
    1,492
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    Lots of design have transistors turned on when on standby. Eg your TV or else the remote control would not work. Your PC is also running with a standby +5 volts feeding the PSU so on pushing a push button you and trigger on the PC without having the mains switched off.

    Important thing is the transistor that was always switched on doesnt consume too much current..

    Allen
     
  5. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    It's a bad question because it can not be answered.

    It's not totally unlikely that it is neither a good nor a bad design and simly does not matter.

    If you want an answer the circuit must be shown.
     
  6. dataman19

    Member

    Dec 26, 2009
    136
    29
    That depends...
    Do you think the fact that the commercial power line is always on -s wasting electricity?
    ..
    Dave
    Phoenix, AZ
     
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