Activity Stream

Filter
Sort By Time Show
Recent Recent Popular Popular Anytime Anytime Last 24 Hours Last 24 Hours Last 7 Days Last 7 Days Last 30 Days Last 30 Days All All Photos Photos Forum Forums Groups Groups
Filter by: Forums Clear All
  • absolom7691's Avatar
    Yesterday, 18:42
    Major sad news about Grant. He was such a cool guy, friendly to his fans, and just really down to earth. He also seemed to really enjoy his work. He will be missed!
    0 replies | 22 view(s)
  • laserist's Avatar
    Yesterday, 17:49
    laserist replied to a thread CYGN-B in The Lounge
    Like this piece:
    193 replies | 12162 view(s)
  • laserist's Avatar
    Yesterday, 17:47
    laserist replied to a thread CYGN-B in The Lounge
    Will do. There are a bunch of odds and ends. I need to figure out how to pack it all.
    193 replies | 12162 view(s)
  • Greg's Avatar
    Yesterday, 13:31
    Greg replied to a thread CYGN-B in The Lounge
    That's great, thanks Brian! I should have enough info to build the DigiMAX (attached images) but multiple options are a plus. One thing I would ask is, at what ever time you are ready to send the control panel, please check with me before shipping, as I will be out of province for a few weeks...
    193 replies | 12162 view(s)
  • laserist's Avatar
    Yesterday, 12:48
    laserist replied to a thread CYGN-B in The Lounge
    I've got a old project (35 year ago) with some d/a & a/d converters. It was a hack to plug into an old AT, but it worked. I can stuff it in with the control panel if you'd like it. It shouldn't be hard to connect it up to the C64's expansion port:
    193 replies | 12162 view(s)
  • buffo's Avatar
    Yesterday, 12:06
    Just got these in the mail today... Very happy! Adam
    0 replies | 33 view(s)
  • Greg's Avatar
    Yesterday, 12:05
    Greg replied to a thread CYGN-B in The Lounge
    Which appear on the pins A input 1 and B input 1 of the "U9 QUAD 2-1 TRI-STATE MUX" 74LS237 according to the schematic. Good, so external inputs were not an impossibility. An interesting result was finally obtained by seeding some registers used by the MYSTRY routine. One of the attached photos...
    193 replies | 12162 view(s)
  • VDX's Avatar
    07-13-2020, 12:06
    ... I've simulated (with discrete setups and "evolved") and tested some beam-optics with different lenses for monochromatic beams (high-power LED's and lasers) and found the results with aspherics and achromats comparable and much better than with "normal" spherics ... the wider the beam (or...
    11 replies | 279 view(s)
  • kecked's Avatar
    07-13-2020, 11:01
    if you beam is 3mm and the lens 10mm or more and you only use the center how does it make a difference. I get what your saying but the nature of this beam seems to render the issue a non issue. ive build many a beam expanders and never found pcx to be an issue. If I use flat pcx in I use flat...
    11 replies | 279 view(s)
  • kecked's Avatar
    07-13-2020, 10:55
    It appears the awe full smell may be Thymol. Itís a legit product but it has a distinct odor and is not meant for hands. Itís pretty alkaline. Relative of phenol.
    6 replies | 261 view(s)
  • laserist's Avatar
    07-13-2020, 05:35
    laserist replied to a thread CYGN-B in The Lounge
    Best guess pins N & R
    193 replies | 12162 view(s)
  • Greg's Avatar
    07-13-2020, 03:47
    Greg replied to a thread CYGN-B in The Lounge
    It turns out that the MYSTR2 and MYSTR4 routines and all the data are just the graphics that appear at the end of the song Synchronicity2. That leaves the MYSTRY routine that accesses the sine table and is doing something when it's 9 bits of input are stimulated. I wonder if it's possible that the...
    193 replies | 12162 view(s)
  • masterpj's Avatar
    07-12-2020, 10:31
    Yes that will be a given. Wanna see how things look with so many wavelengths on video too. I'm assuming you are using really narrow band pass (I think that's what it's called) dichroics so you can combine both 405nm and 445nm without too much losses.. I think i've seen those in the past.. unless...
    21 replies | 673 view(s)
  • VDX's Avatar
    07-12-2020, 07:38
    ... yes, this was my intention with "better 'Depth of Field' with wider beams" :cool: Viktor
    11 replies | 279 view(s)
  • VDX's Avatar
    07-12-2020, 07:35
    VDX replied to a thread Ancient Diode Laser in Lasers, All Kinds.
    ... uh - that's pretty old!! I've got my first "high power" laserdiode around 1992 - bigger TO housing, 1 Watt max. CW, price was 1500 Deutschmarks :cool: Viktor
    1 replies | 110 view(s)
  • Eidetic's Avatar
    07-12-2020, 06:35
    Here's one that's really, really old. This RCA type TA2628R GaAs laser was made in February of 1969 according to the data sheet in the box. Looking through old publications, I found the "new product introduction" for it in The Laser Newsletter of December 1966, and the ad below in Laser Focus the...
    1 replies | 110 view(s)
  • Eidetic's Avatar
    07-12-2020, 06:20
    It's my understanding that achromats are better to use than singlets for monochromatic light because they are also corrected for spherical aberration, allowing much more of the lens to be used.
    11 replies | 279 view(s)
  • dkumpula's Avatar
    07-12-2020, 04:10
    +1 from me, Hank! On FB, I'm only connected to fellow laserists and laserist groups, so I avoid family / other folks that use FB to reveal their darker views. As for Pangolin, I've only seen them be extremely generous to the SELEM crowd and to me personally over many years. (Kudos to...
    16 replies | 707 view(s)
  • absolom7691's Avatar
    07-11-2020, 19:24
    Agreed!! Bill has helped me out on a number of occasions. Customer service with Pangolin is tops, no matter how much or how little you spend!
    16 replies | 707 view(s)
  • hakzaw1's Avatar
    07-11-2020, 18:47
    I give Bill 100% credit for my becoming more than a hobby level Chi-projector owner. PANGO is very generous with door prizes at SELEM and other meets. and I was impressed with how Bill treats everyone the same--like VIPs. ---THANKS all at Pangolin.. Len MYB we should be buying Bill a ...
    16 replies | 707 view(s)
  • absolom7691's Avatar
    07-11-2020, 14:46
    I understand. For those who publish shows on forums/youtube/facebook, it makes sense to have the highest quality to add validity to a new product. For my living room laser show, that's the equivalent of using a Ferrari to pick up the groceries! My projectors are all single-mode 250mW...
    21 replies | 673 view(s)
  • dkumpula's Avatar
    07-11-2020, 13:42
    Nice work, PJ! I'm plugging away at it, I swear! :) I think I'm a week away from completing this two Saturn build. Things are obviously a bit messy at the current state. For those of you that I haven't told, this build is essentially half of this 4 Saturn single-mode build. So that's...
    21 replies | 673 view(s)
  • james's Avatar
    07-11-2020, 07:15
    A harmonograph is a physical machine. There are variations on the idea, but the classic design is modeled in math simulations using four pendulums. A pendulum does indeed swing in sinusoidal motion, but it takes two sin functions to emulate the fact that it can swing in ellipses (not just one...
    319 replies | 77315 view(s)
  • buffo's Avatar
    07-11-2020, 05:47
    Wow - an Amiga reference! Now that's the sort of compliment I can get behind! :) Adam
    21 replies | 673 view(s)
  • buffo's Avatar
    07-11-2020, 05:25
    Completely agree. Soap and water is far superior to hand sanitizer! Although there are situations where hand sanitizer is the only option, as soon as you get to a place where you can wash with soap and water, you should always do that even if you used hand sanitizer previously. (And remember to...
    6 replies | 261 view(s)
  • buffo's Avatar
    07-11-2020, 04:49
    I'm going to take a stab at this. Maybe I'm missing something, but this seems like it's a solved problem? Yup - agreed. But all pendulums follow sinusoidal motion with decaying amplitude. (A pendulum is pretty much the definitive example of sinusoidal motion, at least in classical...
    319 replies | 77315 view(s)
  • buffo's Avatar
    07-11-2020, 04:31
    buffo replied to a thread Galvo/Amp Upgrade in Modifications
    Thanks to Andrew for re-drawing the schematic. :) Also, he correctly pointed out that interrupting the ground connection on the modulation input won't work because of the shared ground on the power input side. I had forgotten about that! But yeah, the correct method is to interrupt the positive...
    15 replies | 372 view(s)
  • buffo's Avatar
    07-11-2020, 03:52
    buffo replied to a thread Hello All, Laser Question/Help in Help!
    I agree with David - there's not much harm you can do to the 506 scanners because the amps will shut down if you do something incredibly stupid, and if you're just doing something marginally stupid the scanners themselves will simply grin and bear it, albeit with a degraded image. :) ...
    53 replies | 6050 view(s)
  • Pangolin's Avatar
    07-10-2020, 20:34
    Yep, I know what you mean. For beam shows, the separation is almost invisible but for graphics, the trick is to just "hide it", by never doing anything that has red alone. I'm interested to see David Kumpula's assembly since he combines using dichroic rather than strictly edge combining as your...
    21 replies | 673 view(s)
  • rodman1369's Avatar
    07-10-2020, 13:05
    My wonderful spouse asked me (again) what I wanted for my Birthday! She asked: What would give me Joy! :D She has now authorized me to order my 2nd Anycubic Mega S on sale for $229.00 Free Shipping from www.Anycubic.com Now...I have to do some rearranging to make room! :cool:
    44 replies | 2522 view(s)
More Activity