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Seeing tutorials about amplifiers

  1. Feb 4, 2008 #1
    Seeking basic tutorials about amplifiers!

    Hi i am looking after some good tutorial for amplifiers, and with amplifiers i mean Inverting amplifier, noe-inverting amplifier and diffrential amplifier. I should point out that i am a new about amplifiers atm.

    Kindly Pellefant ...
     
    Last edited: Feb 4, 2008
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  3. Feb 4, 2008 #2

    berkeman

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  4. Feb 4, 2008 #3
    In more detail i need tutorials here i calculate on some simpel amp ... I haven't found any pedagogic tutorial for that yet :( ...
     
  5. Feb 4, 2008 #4
  6. Feb 4, 2008 #5

    chroot

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  7. Feb 25, 2008 #6
  8. Feb 25, 2008 #7
    does v+ = v- under all conditions or just when the output is fedback into the + or - terminal??
     
  9. Feb 25, 2008 #8

    chroot

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    An op-amp will drive its inputs to the same voltage when it is physically possible. The amplifier cannot produce higher voltages than those of its supplies. Also, it cannot it source more power than it is designed to source, or more than the power supplies can deliver.

    If you wire up an op-amp without any feedback, it will generally just rail one way or another. An op-amp circuit without any feedback would be entirely pointless.

    - Warren
     
  10. Feb 25, 2008 #9
    is this because it ideally has infinite gain and its unstable with such high gain, so the feedback stabilizes it? I haven't studied opamps in a couple years, but what about a differential operation of just subtracting v- from v+, where neither one is at ground level, does this still require feedback? I think almost all of the examples I've worked on and have read in my text book have always had one terminal grounded and it has given me a very limited idea of how to use and design circuits using opamps.
     
  11. Feb 25, 2008 #10

    chroot

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    Yep, difference amps still require feedback. See, e.g. http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar6.html#c1

    - Warren
     
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