Suitable op amp for 60 Hz oscillator

Discussion in 'The Projects Forum' started by Dominick, Jun 21, 2010.

  1. Dominick

    Thread Starter Member

    Dec 6, 2008
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    Don't mean to hijack this but would a LM339 be a suitable chip to
    create a 60hz sine-wave?
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    No. LM339 is a quad comparator.
     
  3. Dominick

    Thread Starter Member

    Dec 6, 2008
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    Wow I think I should read the top of the data sheet before asking questions
    Don't know why but I was thinking it was a quad opamp.

    The original circuit called for an LM348 and all I could find in my box was the 339 and only one 741.

    So my next question is is there a better chip for a 60hz sine-wave?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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  5. Ron H

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    Apr 14, 2005
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  6. Ron H

    AAC Fanatic!

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    The original Bubba oscillator thread does not show up in any forum on my computer. The only way I can get to it is by clicking on the link above.
     
  7. beenthere

    Retired Moderator

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    To Ron H: The post is back in the bubba oscillator thread. That thread is from April, so it's pretty far back.
     
  8. SgtWookie

    Expert

    Jul 17, 2007
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    The ORIGINAL schematic in the TI publication called for a TLV2474 quad opamp.

    TI's page for this device:
    http://focus.ti.com/docs/prod/folders/print/tlv2474.html
    Datasheet: http://www.ti.com/lit/gpn/tlv2474

    Read this: http://focus.ti.com/lit/an/slyt164/slyt164.pdf
    You will find the Bubba oscillator described on the last couple of pages.

    Read through the entire document, and try hard to understand the math behind it. If you can understand the math, getting the output frequency you want is just a matter of plugging in your numbers to the formulas shown.

    [eta]
    I am attaching a model and LTSpice .sym file for the TLV247xA family of opamps. This covers the TLV2471A, TLV2472A, and TLV2474A. You will need to install the free LTSpice program from Linear Technology to use it. Google "LTSpice Download".

    There are two files in the .zip archive:
    TLV247xA.sub - goes in \Program Files\LTC\SwitcherCad\lib\sub
    TLV247xA.sym - goes in \Program Files\LTC\SwitcherCad\lib\sym\Opamps

    The next time you start LTSpice, you will see the TLV247xA available in the Opamps directory.
     
    Last edited: Jun 21, 2010
  9. Dominick

    Thread Starter Member

    Dec 6, 2008
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    I thank you much, will be going over it soon :) .
     
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