Homebrew Analog Computer

Discussion in 'The Projects Forum' started by mikep56, Jun 11, 2011.

  1. mikep56

    Thread Starter New Member

    Feb 27, 2009
    7
    0
    Hi All,
    This is a great forum for both newbies and advanced techies alike. I am a senior level tech and I have rediscovered analog computers. I would like to build a homebrew analog computer with op amps, obviously. I have done extensive research and found that detailed schematics are in rather short supply. I have come up with a few partial schematics that I am going to try to cobble together, and see how it performs. I will be building a +/- 10V system. I want to be able to solve 2nd order differential equations, and have my young nephews use it to solve simple algebra problems.
    However I have a few questions:

    1) Is there any advantage to using 2 op amps, one to do a summer function followed by an integrator op amp; as opposed to using a summing junction on the input of the integrator op amp, thereby saving 1 op amp?
    2) I have available both 741s and TL084s. Any preference?

    Thanks for any feedback that comes my way!
    Regards,
    Mike
     
  2. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    I think a single opamp can sum and integrate at the same time.
    Use the 741's as kitty litter.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    You would be better off with a low voltage op amp, such as the LM324 quad. The 741 is good for low frequencies, but its power supply specs are nonexistent. Think ±15VDC. A LM324 will go down to 3V on the power supply, and handle your ±10VDC power supplies just fine.

    Most op ams do not handle near the power supply rails very well, so figure your going to get ±8V with that power supply range.
     
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