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Thread: Rebuilding my old analog console

  1. #181
    Join Date
    Jun 2009
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    St. Louis, MO
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    1,211

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    I've got an little old CNC mill so I can just program it up to do .010 cuts, and walk away while it's running.
    "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

  2. #182
    Join Date
    Sep 2014
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    Colorado USA
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    Quote Originally Posted by laserist View Post
    I've got an little old CNC mill so I can just program it up to do .010 cuts, and walk away while it's running.
    Yep, that's what we would be using as well.
    ________________________________
    Everything depends on everything else

  3. #183
    Join Date
    Mar 2010
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    Quote Originally Posted by Kevint View Post
    The question is what to do with L and M? I think I read in the CYGN thread that a potentiometer went across those points, but the text on the drawing reads KQO "Q" control input for L, and KQO "Q" control return for M.
    Yes, a potentiometer goes across those points. That is the resonance control for how many loops in the spiral.
    Last edited by Greg; 04-02-2024 at 20:19.

  4. #184
    Join Date
    Nov 2023
    Posts
    118

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    Lasermster1977 - thanks for trying on the mirror mounts.

    Mixedgas - thank you for the advice on the transistors.

    Laserist - thanks for the machining input.

    Greg - thanks for the KQO L and M input. I also found a secondary drawing in the CYGN thread that show there should be a dual pot on the outputs of thr KQO.

    Just finished the hard wire of the 3 fixed quadrature oscillators and all are working well.
    Attached Thumbnails Attached Thumbnails 20240402_220002.jpg  


  5. #185
    Join Date
    Mar 2010
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    592

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    The FET for the KQO is the 2N3820. It was pointed out to me early on that many of the discontinued parts called for in the LII schematics are available on ebay. Here is a photo of my inventory. If you don't want to get them online, I can send you some when I get around to returning laserist's prototype.
    Attached Thumbnails Attached Thumbnails 2N3820_inventory.jpg  


  6. #186
    Join Date
    Nov 2023
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    Thanks Greg. I found some 2N3820's on line.

  7. #187
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    Nov 2023
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    I'm pretty sure all of you have seen this, but I thought I would still post it. Good info. ADI Multiplier Application Guide.
    Attached Files Attached Files

  8. #188
    Join Date
    Sep 2014
    Location
    Colorado USA
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    Quote Originally Posted by Kevint View Post
    I'm pretty sure all of you have seen this, but I thought I would still post it. Good info. ADI Multiplier Application Guide.
    Oh, very nice contribution, Kevint. I hadn't seen this app guide . Thanks!
    ________________________________
    Everything depends on everything else

  9. #189
    Join Date
    Nov 2023
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    118

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    Lasermaster1977: glad you liked it.

    Last night I was playing around with the oscillators, function generator and multipliers and came up with something the partially resembles one of laserium effects I really like. It is in the song secret journey. See the link.

    I basically AM modulated a circle with a sawtooth wave. I set the frequency of the circle to have medium density of rings and to a point where the retrace line was stable to try to hide it. I set the symmetry on the sawtooth to 91% to soften the retace line and make it not so noticeable. Then summed a low frequency to move it up and down. See video to what it looked like.

    Laserium Secret Journey. See time stamp 3:05
    https://youtu.be/8bZiNeXXaQs?si=eMV3UMZEaCqx5RU5

    I found some advanced vidio features on my phone to better capture the image. Had no idea these were their until last night.
    Attached Files Attached Files

  10. #190
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    Sep 2014
    Location
    Colorado USA
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    Quote Originally Posted by Kevint View Post
    Lasermaster1977: glad you liked it.

    Last night I was playing around with the oscillators, function generator and multipliers and came up with something the partially resembles one of laserium effects I really like. It is in the song secret journey. See the link.

    I basically AM modulated a circle with a sawtooth wave. I set the frequency of the circle to have medium density of rings and to a point where the retrace line was stable to try to hide it. I set the symmetry on the sawtooth to 91% to soften the retace line and make it not so noticeable. Then summed a low frequency to move it up and down. See video to what it looked like.

    Laserium Secret Journey. See time stamp 3:05
    https://youtu.be/8bZiNeXXaQs?si=eMV3UMZEaCqx5RU5

    I found some advanced vidio features on my phone to better capture the image. Had no idea these were their until last night.
    Nice work on recreating Laserium effect!

    Or...it could be a Dune sand worm
    ________________________________
    Everything depends on everything else

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