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Thread: CYGN-A

  1. #111
    Join Date
    Mar 2010
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    246

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    Interesting. The latest show I saw was Crystal Odyssey. If my understanding is correct, the Beatles came after that. I haven't heard of the clipper card. I don't see it referenced in the L.II system diagram hybrid card cage, nor in the L.6c system block diagram, nor in Ron's 6b alignment procedures doc.

  2. #112
    Join Date
    Jun 2009
    Location
    St. Louis, MO
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    897

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    Sorry, the clipper card wasn't added in 82 it was added in 81. It was modified to add AO Driver in 82. I'm guessing the Clipper board and controls were added as part of the Crystal Odyssey Mods. The Clipper did what it's name implied. It gave the Laserist control over where the positive and negative ends of the X & Y signals (from the master gain control of the CYGN-A) were clipped. The two clipper circuits used one each of the AD811 and AD821 dual transistors so a it would take a bit of a redesign today. FWIW I never liked the clipper effect on the G-124 open loop scanners, and I never saw anything cool enough to make me really want to use it. I'll try to make it by UPS this weekend and send the packages sitting on my steps.
    "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

  3. #113
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    Mar 2010
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    Awesome! Looking forward to that. Yeah, I remember the opening number of Crystal Odyssey had something that was like Danube circles but if I remember right it was more like rounded rectangles. Maybe that was evidence of the clipper.

  4. #114
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    Mar 2010
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    More time spent hunting microscopic flecks of conductivity than I would prefer, but the spiral and effects board is ready to be wired to the panel. Then I'll finally get to the exciting part: setting up a bunch of Single-ended-to-Differential Signal Converters and controlling a projector without the use of a DAC. I can't wait to see how the colormod looks.
    Attached Thumbnails Attached Thumbnails effects_module.jpg  

    ILDA_port.jpg  


  5. #115
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    Mar 2010
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    246

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    Wondering if there's a story about the chopper signal. Guessing a variable width square wave from a 555, though maybe it listened to the spiral generator at times for retrace blanking.

  6. #116
    Join Date
    Jun 2009
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    St. Louis, MO
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    897

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    The original chopper was a General Scanning G300 series scanner with a slotted can shutter. That produced a soft edge effect. With the Beatles show it was replaced with an AOM. Hard edges, but much faster. There were 4 toggle switches to set the chopper mode. One for PDM. Two to select between 0, 1 & "multiplex drive", and one as an enable. Later a PCAOM or two replaced the AOM. As Laser Images got older and smaller improvements happened on an increasingly intermittent time line.
    "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

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