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Thread: Analog Galvo Driver

  1. #31
    Join Date
    May 2013
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    Fort Mill, SC
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    From what I am gathering all you need is a summing amp and some passive components and you will be well on your way.

    Quote Originally Posted by pschlosser View Post
    And I'm following this thread with interest.

    I don't have much to add, other than I have several BB 4423s I'd like to put to use.


  2. #32
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    May 2013
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    Fort Mill, SC
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    @laserist This should bring back some memories.

    Mark 4 Patent
    http://patft.uspto.gov/netacgi/nph-P...S=PN/4,006,970

  3. #33
    Join Date
    Jun 2009
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    St. Louis, MO
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    I outed that patent on the old laserist list about a decade ago. I've got 2 - Mark 6B's and a Mark 600 (a Mark 4 optical head and what evolved into the Mark 6 console) here in St. Louis for my reboot experiment. (and to bring them all up to performance standard…) I've been flying down memory road…

    Laserium's analog quadrature osc used 2 OpAmps for the sin/cos and a third for inv sin, but the inv sin signal was inserted into the sin/cos feedback loop for fine freq control if I recall...

    Quote Originally Posted by SaltyRobot View Post
    @laserist This should bring back some memories.

    Mark 4 Patent
    http://patft.uspto.gov/netacgi/nph-P...S=PN/4,006,970
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  4. #34
    Join Date
    Dec 2007
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    38.9235N -89.9345W
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    Did someone say quadrature oscillator?

    Like this?

    Click image for larger version. 

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    As is outputs sine waves of pretty good quality. Frequency range is not bad, you can switch the capacitors to make different frequency ranges. Since it's a voltage controlled oscillator you can do frequency modulation pretty easy (sum/switch in a signal where the potentiometer sits. Easy to make the sine into a square wave with another op-amp at high gain. You can turn that into a triangle wave with a little more work.

    3280s aren't impossible to find. Sure ain't $90, or you aren't looking hard enough. I made a 'lifetime buy' a few years ago.

  5. #35
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
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    2,136

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    I have the L. micheal blackbook circuits if someone really wants them. I think I got the last one. http://www.galco.com/buy/Burr-Brown/4423

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