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Thread: CYGN-B

  1. #231
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    Mar 2010
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    Here's a dogloid. (photo)

    To do: Fully test and tidy the code, hack the digimax to get DC output and possibly separate the four DAC outputs so at least two of the four DOGN channels may be enjoyed at the same time.

    I will have to begin linking to videos of this output, as this is doing a manner of clever motions that need to be seen.
    Attached Thumbnails Attached Thumbnails DOGN_dogloid.jpg  


  2. #232
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    Getting DC from the DigiMAX only required shorting two caps. These photos show examples the DOGN output, including the dogloid which I previously speculated involved a ramp waveform (It doesn't.) As Brian predicted, these are a bit disappointing, even seen here on the beautiful Tektronix 604A. I have a request in to a local university for the return of my Catweazle, from which I'll produce a catalog of each DOG patch, and my 594 HeNe will be happy to finally get a chance to do something useful.
    Attached Thumbnails Attached Thumbnails DOGN_DC_1.jpg  

    DOGN_DC_2.jpg  

    DOGN_DC_3.jpg  

    DOGN_DC_4.jpg  

    DOGN_DC_5.jpg  

    DOGN_DC_6.jpg  


  3. #233
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    Jun 2009
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    St. Louis, MO
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    The freaky thing is I can imagine the next step in most of those images. Admittedly I sat and watched the last show (for at least!) 5 nights a week for 4 years before I did my first Laserium show.

    Thanks!
    "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. #234
    Join Date
    Feb 2015
    Location
    San Francisco
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    184

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    Greg,

    Looks like you've made great progress! From what I see on your sillyscope, you've got it working beautifully! You're giving me Laserium flashbacks!

    I had never heard the term "Catweasle", however, and had to do a search. I still don't really understand how an obscure medieval British sitcom relates to medieval Laserium imagery.

    Ron


    Quote Originally Posted by Greg View Post
    Getting DC from the DigiMAX only required shorting two caps. These photos show examples the DOGN output, including the dogloid which I previously speculated involved a ramp waveform (It doesn't.) As Brian predicted, these are a bit disappointing, even seen here on the beautiful Tektronix 604A. I have a request in to a local university for the return of my Catweazle, from which I'll produce a catalog of each DOG patch, and my 594 HeNe will be happy to finally get a chance to do something useful.

  5. #235
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    Mar 2010
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    It relates through Karn Evil 9, not really. I see what you mean, it's not obvious through a search that catweazle refers to galvos by MediaLas:

    http://www.laserist.org/Laserist/Tech_focus_p4.html

    Photos show the dogloids tested with G100 scanners, an audio amp, and the unmodified DigiMAX (no DC.)

    DC test coming next.
    Attached Thumbnails Attached Thumbnails HeNe594.jpg  

    G100.jpg  

    dogloid.jpg  

    dogloid2.jpg  

    CrystalDogloid.jpg  


  6. #236
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    Feb 2015
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    You have a yellow HeNe? Rare! I have one at the Exploratorium that I put into an exhibit.

    Ron

    Quote Originally Posted by Greg View Post
    It relates through Karn Evil 9, not really. I see what you mean, it's not obvious through a search that catweazle refers to galvos by MediaLas:

    http://www.laserist.org/Laserist/Tech_focus_p4.html

    Photos show the dogloids tested with G100 scanners, an audio amp, and the unmodified DigiMAX (no DC.)

    DC test coming next.

  7. #237
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    Jun 2009
    Location
    St. Louis, MO
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    I just think it's cool that if you get far enough from 575nm digital cameras will stop seeing green...
    "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

  8. #238
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    Mar 2010
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    Here are some photos of more Laserium Flashbacks from the DOGN. Providing DC to the audio amp input to drive the G100's works but only for little DC. Conveniently, converting 0 to 5VDC DAC output into -+10V control voltage is a very common thing to do, and VREF is available on one of the pins of the DigiMAX C64 8 bit stereo DAC. And I have the Catweazle back (Thank you Michael of The Photon League), so a video catalog of DOGN output with laser is coming.

    Four of the 16 dogloid patches are a waving conductor's baton effect that kind of looks like a light saber or a drum stick, and is very recognizable from the old shows. One photo here imperfectly shows this.
    Attached Thumbnails Attached Thumbnails dogloid3.jpg  

    dogloid4.jpg  

    dogloid5.jpg  

    dogloid6.jpg  

    dogloid7.jpg  

    dogloid8.jpg  


  9. #239
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    Mar 2010
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    Go ahead and ridicule my inefficient use of breadboard. Here are oscillators 1 and 3 of the CYGN-B prior to the permanent build. One axis of each oscillator is output to the sillyscope. Notice that the lissajous is rock stable. This proves that the legend of the syncing 555's is true. Investigating this unique feature of the CYGN-B is something I have wanted to do for a long time.
    Attached Thumbnails Attached Thumbnails CYGN-B_osc1and3_sync.jpg  


  10. #240
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    Mar 2010
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    Here's an update photo of the CYGN-B build. Oscillator 2 is in progress. The oscilloscope photos each show two oscillators. The signal is taken from one of the output "bits" of that oscillator's Johnson counter. One photo shows illegal states, which sometimes occur on power up. The other photo shows the same signals after use of the counter reset button I added. The schematic shows the reset circuit which replaces the MOSFET part of the circuit.
    Attached Thumbnails Attached Thumbnails CYGN-B_Oct31.jpg  

    CYGN-B_illegal_states.jpg  

    CYGN-B_after_reset.jpg  

    reset_timer.png  


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