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  • ronhip's Avatar
    Yesterday, 22:32
    ronhip replied to a thread CYGN-B in The Lounge
    Greg, The spiral card only was really a fancy VCA. You fed in signals from cycloids (or elsewhere) and it would change the size in a ramped fashion. You could adjust the spiral-IN and spiral-OUT rates (varying the waveform controlling the VCA from a sawtooth to a triangle to the opposite...
    85 replies | 1764 view(s)
  • ronhip's Avatar
    Yesterday, 22:16
    ronhip replied to a thread CYGN-B in The Lounge
    Greg, You might look for an old Spitz star ball. There must be some of those around. Spitz sold many many A3 and A3P projectors and many (most?) of those have been replaced with more modern equipment. The more modern version I used at San Francisco State University (a Spitz 512) was installed 47...
    85 replies | 1764 view(s)
  • Greg's Avatar
    Yesterday, 22:10
    Greg replied to a thread CYGN-B in The Lounge
    Ron, yeah that was a great kit. Required multiple power supplies. One of the 3 inductances was something like 5 Henrys! The book on the history and theory of formant synthesis was possibly the best part.
    85 replies | 1764 view(s)
  • Greg's Avatar
    Yesterday, 21:59
    Greg replied to a thread CYGN-B in The Lounge
    I remember the fixed cycloid select knob, and that one of the settings was the KQO. I didn't know there was a different spiral generator that was not the KQO. My memory of the system is mostly before the installation of the AOM. Is it possible the "real" spiral generator was added to the system...
    85 replies | 1764 view(s)
  • Greg's Avatar
    Yesterday, 21:24
    Greg replied to a thread CYGN-B in The Lounge
    Hi DZ. I'm looking for an opportunity to obtain any piece of vintage planetarium equipment that I could use to project a decent looking star field. I have read that the Zeiss models used metal foil with tiny holes of varying sizes meticulously punched through, and colored glass to account for color...
    85 replies | 1764 view(s)
  • DZ's Avatar
    Yesterday, 21:00
    Resolution. .
    79 replies | 16354 view(s)
  • james's Avatar
    Yesterday, 20:59
    Ok. But what do you gain by saving laser show waves as 24 bit instead of 16?
    79 replies | 16354 view(s)
  • DZ's Avatar
    Yesterday, 20:15
    So far I've not run into a file size issue. Typically, a 50 minute laser show is just over 2GB and I always carve up the show by song so that I can drag and drop my own playlist on the fly. I can chain 2 Wave-USB's together for up to 20 channels of 24-bit 48KHz audio and my very old laptop...
    79 replies | 16354 view(s)
  • james's Avatar
    Yesterday, 19:15
    I understand why you might want to record analog signals in 24 bit. That way you have lots of headroom. But please don't tell me you can see a difference between 16 and 24 bit wave playback. That's ridiculous. Storage might be cheap, but file systems like FAT32 and NTFS have a maximum single...
    79 replies | 16354 view(s)
  • DZ's Avatar
    Yesterday, 18:50
    Why, on Earth, not? Why sacrifice resolution? It's not like storage is expensive these days.
    79 replies | 16354 view(s)
  • james's Avatar
    Yesterday, 18:38
    Why, on Earth, would you want to save laser signals to a 24-bit wave?
    79 replies | 16354 view(s)
  • DZ's Avatar
    Yesterday, 18:02
    DZ replied to a thread CYGN-B in The Lounge
    This has been an absolutely awesome thread to read thru. Thank you folks for sharing!
    85 replies | 1764 view(s)
  • DZ's Avatar
    Yesterday, 17:48
    I've played around with lcadat quite a bit, it does what it was designed to do, take an analog stream and chop it all to hell to make arbitrary frames out of them. I use N-Track quite a bit for recording stuff but I do enjoy using Audacity for modifying shows. In the past, Audacity did support...
    79 replies | 16354 view(s)
  • dkumpula's Avatar
    Yesterday, 13:11
    Looking at the projector, I think itís likely that you have TTL modulation which is no-bueno when it comes to crowd scanning beams in your home environment. Converting to analog and adding ILDA capability is certainly possible, but would likely mean dumping all of the auto mode and SD card...
    15 replies | 307 view(s)
  • kecked's Avatar
    Yesterday, 12:38
    there is no cheap disco scan lens. AND you only get one set of eyes so cheap isn't important here. JUST DONT LOOK AT THE BEAM DIRECT. that's it.
    15 replies | 307 view(s)
  • jemath's Avatar
    Yesterday, 12:21
    Noted and understood - thanks for clarifying the safety side. Will work with two tracks onwards then: the filter-easy-lane and then the longer term correct way down the DAC lane... Thanks also for the tip of off-axis ND mounting which Iíll test. Also need to look for a cheap ďdisco scan lensĒ...
    15 replies | 307 view(s)
  • kecked's Avatar
    Yesterday, 11:56
    be careful in the words used. "You'll be fine watching graphics ON THE WALL AS A REFLECTION OFF THE WALL" not LOOKING INTO THE LASER. Understand? Very important. You NEVER look down the beam toward the projector just at the image reflecting off a none shiny surface like a flat painted wall. ...
    15 replies | 307 view(s)
  • jemath's Avatar
    Yesterday, 11:37
    Thanks again all for very useful feedback. Need to study all those details :-) @Kecked: you write just turn down the analog signal input...which I then take means to go down the path of DAC and what have we? :) donít have a 360 view of how to hack that connection to the projector still and see...
    15 replies | 307 view(s)
  • Glrock's Avatar
    Yesterday, 11:28
    Still looking to buy them. Now willing to pay $325. I really canít go any higher. Thanks for understanding.
    5 replies | 455 view(s)
  • kecked's Avatar
    Yesterday, 09:45
    Nope. Wonít work. You need to expand the beam with a beam expander then scan that. That needs two lens. Best way is to just drop the power on the modulation side. If you use a neutral density filter make sure to mount it slightly off axis so you do not send a reflection back to the diodes. The...
    15 replies | 307 view(s)
  • akmetal's Avatar
    Yesterday, 09:34
    What does AVLIS stand for
    4 replies | 55 view(s)
  • akmetal's Avatar
    Yesterday, 09:24
    I do have access to the university library system which I would pursume would include papers. Its just a hassle as I have to drive down. I may look into figuring out how to get access online
    4 replies | 55 view(s)
  • mixedgas's Avatar
    Yesterday, 07:17
    CRC books are lists of wavelengths sorted by the lasing material, the excited state, and then a citation of the relevant journal references where research was published. . If you don't have academic or professional access to academic journals they are nice paperweights. In a few cases they...
    4 replies | 55 view(s)
  • mixedgas's Avatar
    Yesterday, 07:14
    You have SILEX mixed up with AVLIS.. Steve
    4 replies | 55 view(s)
  • james's Avatar
    Yesterday, 06:06
    If you go into the settings of Audacity, you can set it to be able to save multichannel waves. So you can open as many waves as you need and export the whole thing as one wave. There is no way to play the wave to anything more than a stereo device though. I used Spider Player for years. I don't...
    79 replies | 16354 view(s)
  • haze's Avatar
    Yesterday, 05:18
    Hello I am in a situation similar to yours, I have a 2w that I use mainly at home and only for amateur use these days to be a little quieter I was thinking of buying a plano-concave lens, I saw that they sell them on edmundooptics unfortunately 50mm is too small for my opening, but maybe they...
    15 replies | 307 view(s)
  • laserist's Avatar
    Yesterday, 04:55
    laserist replied to a thread CYGN-B in The Lounge
    The original laserium spiral generator was a linear ramp where the in rate and out rate were independently controlled. At some point a Burr Brown 4302 was added to allow the laserist to adjust the shape of the ramp signal. I thought it was a pretty ugly effect in general, but I did used it...
    85 replies | 1764 view(s)
  • polishedball's Avatar
    Yesterday, 04:03
    I use the usbstreamer as well great device and price. DZ has a great tutorial for foobar2000 using the streamer. http://www.aldebaran-systems.com/showplay.htm
    79 replies | 16354 view(s)
  • kecked's Avatar
    Yesterday, 02:22
    I went with usbstreamer and called it a day. Converting to frames I do not need. I just need smooth playback. Iím using pro tools for playback. I tried Vegas and could not figure the way to assign the outputs to the streamer. I tried audacity and again canít figure how to assign the outputs. I...
    79 replies | 16354 view(s)
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