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BJT Output Stage

Discussion in 'General Electronics Discussion' started by cyntrex, Dec 7, 2015.

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  1. cyntrex

    cyntrex

    2
    0
    Dec 7, 2015
    Hello.

    I need some help with this little BJT circuit. Its meant to switch the load at the Q3 collector on and off. Q1 &Q1 are controlled by 5V. Q1 should be able to limit the voltage at Q3 base, or in the other case, get it up to 24V, so that there is no voltage at Q3 base-emitter. Would this circuit work like this and do i just have to adjust the resistors, or am i completely off guard here? I'm kinda stuck here, so any help is appreciated.

    Kind regards
     

    Attached Files:

  2. Kabelsalat

    Kabelsalat

    148
    27
    Jul 5, 2011
    Hi.

    Looks like some part of your schematic is missing.

    You're in great risk of making a shortcut through Q2 and Q3.
     
  3. cyntrex

    cyntrex

    2
    0
    Dec 7, 2015
    The rest of the schematic is just my logic circuit, which also assures, that Q1 and Q2 will never be active at the same time. So no shorts there.
     
  4. Colin Mitchell

    Colin Mitchell

    1,417
    313
    Aug 31, 2014
    That circuit will blow up. Good luck.
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,771
    2,427
    Nov 17, 2011
    Not if the op can ensure that Q1 and Q2 are never "On" at the same time.
     
  6. AnalogKid

    AnalogKid

    2,425
    690
    Jun 10, 2015
    What is the load being switched. Also, what is your question? Does the circuit not work as intended? If so, in what way?

    ak
     
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