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Help finding an op-amp

  1. Jul 17, 2012 #1
    Hey everyone,

    Whelp, I've had this project dancing around in the back of my mind for a good six months now and I'm here to ask for some help. I'd like to build this biofeedback device from an old issue of Popular Electronics:
    http://72.52.208.92/~gbpprorg/mil/mindcontrol/Build_A_Brain_Wave_Feedback_Monitor.pdf

    The problem I'm running into is that the op-amps (Signetics N5556) are old and just about impossible to find. I've checked all of the electronics outlets I can think of for them, and the other parts were easy enough to source. Does anyone have a link to a shop that would carry something obscure like this? Barring that, could anyone suggest a substitute that's readily available?

    I'm just a hobbyist that enjoys building weird things so I apologize if this is a goofy question. Any expert advice would be GREATLY appreciated. Thank you!
     
  2. jcsd
  3. Jul 17, 2012 #2
    Simply use TL071 instead of N5556.
     
  4. Jul 17, 2012 #3
    There are many choices that would likely work, because this was a fairly crude technology. The TL071 is probably good. Otherwise, I'd suggest an OPA277, which has fairly close characteristics and is based upon the same technology.
     
  5. Jul 17, 2012 #4
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