Home Made Function Generator

Discussion in 'The Projects Forum' started by SteveO, Dec 8, 2009.

  1. SteveO

    Thread Starter Active Member

    May 15, 2008
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    I have thought about making a function generator for my lab bench. The end result would probably have square/triangle/sine wave functions with at best amplitude/duty cycle/frequency adjustments.

    What are thoughts on what to use? I know there are a number of ways to accomplish this, but would it be easier to completely use a PIC, or maybe 555 timers / op amps to create the signals and a PIC to control the system.

    Any thoughts are appreciated, still in preliminary thoughts...
     
  2. BMorse

    Senior Member

    Sep 26, 2009
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    you can easily design one around the MAX038 IC to generate 0.1Hz - 15MHz sinusoidal, square and triangle frequency... here is a link to a project based around this IC that was made in circa 1996....http://electronics-diy.com/electronic_schematic.php?id=584

     
  3. SteveO

    Thread Starter Active Member

    May 15, 2008
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    Very good read. Thanks.

    addition: do you know where I can purchase this part? digi-key/mouser don't seem to carry it. Possibly out of production?
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
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    The max 038 circuit is not produced any more. It may be hard to get, and it is also very expensive. So I would not recommend using it in a new design
     
  5. BMorse

    Senior Member

    Sep 26, 2009
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    Now that I think about it, it is no longer supported but then there is the ICL8038 from Intersil and the XR8038A manufactured by exar.... don't know if those are still inproduction....

    edit: my bad, it looks like intersil no longer supports that device either...
     
  6. SteveO

    Thread Starter Active Member

    May 15, 2008
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    Thanks again. Neither of the latter 2 mentioned seemed to be available either. I will try searching for alternatives, if anyone else knows of any shout them out!
     
  7. t06afre

    AAC Fanatic!

    May 11, 2009
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    I think the ICL8038 also is gone;)
     
  8. BMorse

    Senior Member

    Sep 26, 2009
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  9. SgtWookie

    Expert

    Jul 17, 2007
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    The only place I've found the MAX038 for sale is futurlec.com; about $21/ea.
    They will take your order right away and charge your credit card right away, but it may take well over a month for your order to arrive.

    Something happened to the plant that manufactured the MAX038 sometime around 2003, I'm not sure what. However, Maxim says the process used to manufacture the MAX038 was lost.

    [eta]
    Jameco stocks the XR2206: https://www.jameco.com/webapp/wcs/s...storeId=10001&catalogId=10001&productId=34972
    It's a far cry from the MAX038, but it's easier to use than trying to piece a function generator together out of opamps or discretes.
     
  10. BMorse

    Senior Member

    Sep 26, 2009
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    the company also offers samples:)
     
  11. Dalaran

    Active Member

    Dec 3, 2009
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    this is cool
     
  12. SteveO

    Thread Starter Active Member

    May 15, 2008
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    Put a sample order in acctually lol. Looks like I will be designing my own circuit, haha but better than $21 each I guess! Thanks all.

    edit: $22.90... must be running low on supplies!
     
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