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
  • laserist's Avatar
    Today, 04:02
    Have you ever fixed or built anything involving electronics?
    3 replies | 164 view(s)
  • jv277742's Avatar
    Yesterday, 15:12
    how do i find out? can i open it and look for it-?
    3 replies | 164 view(s)
  • laserist's Avatar
    Yesterday, 14:56
    An open ground to one amp?
    3 replies | 164 view(s)
  • jv277742's Avatar
    Yesterday, 14:39
    good evening :-) my 10W RGB laser gives a distorted image, in the following video you can see how it draws the ilda test pattern, I do this with beyond. https://photos.app.goo.gl/bmur7tJ9zsqDFQAK9
    3 replies | 164 view(s)
  • lasermaster1977's Avatar
    Yesterday, 12:43
    @Photonlexicon used a nice solution that he shared with me. I thought I had posted this before (maybe I did but I couldn't find it so here it is again. I used this "inverse" of the slotted can solution with both G115 open-loop and G120PD closed-loop scanners. No question it worked best with the...
    286 replies | 1067492 view(s)
  • laserist's Avatar
    Yesterday, 10:14
    The Mark IV & Mark VI projectors used a big old non-feedback galvo that looked like a G330 for chopper. The Mark IV used the same galvo for scanners. The chopper was a slotted can. It was relatively slow with soft edges. If I was designing something today I'd make it capable of higher speeds and...
    286 replies | 1067492 view(s)
  • davedrosen's Avatar
    11-05-2024, 19:49
    davedrosen added 6 photo(s) to album Quanta-Ray DCR and GCR
  • katzenklavier's Avatar
    11-05-2024, 19:35
    Hello forum! I recently learned how to fix Verdi lasers, and once I had one working, I was captivated by the beauty of the SLM green light. I would like to fix some more Verdi lasers, to get to know them a little better. Really, just for the fun of it. If anyone has Verdi, Chameleon, or...
    0 replies | 325 view(s)
  • lasermaster1977's Avatar
    11-05-2024, 15:04
    The missing variable potentiometer could be most any value where its full resistance plus the 3.3K Rin to the 2nd op amp and it's .22uF feedback resistor makes up an integrator that generates a triangle-like waveform. The triangle wave is feedback to the positive input of the first op amp thereby...
    286 replies | 1067492 view(s)
  • Greg's Avatar
    11-05-2024, 11:29
    I don't. That is part of what I'm posing as a question to the community. I have been using the ramp generator which I sent you, also called the colormod2 circuit, for both chopper and colormod effects. When needed, I also use the PDM signal from the spiral board for retrace blanking. For more...
    286 replies | 1067492 view(s)
  • Kevint's Avatar
    11-05-2024, 08:33
    Greg, thanks for posting the schematic. I haven't even gotten around to thinking about what to do with chopping yet. Do you know if there is any info on what feeds the various inputs to this circuit?
    286 replies | 1067492 view(s)
  • Kevint's Avatar
    11-05-2024, 08:31
    Laserist. I totally agree and that is the goal. You are right, ever since I started this thing, it continues to evolve and get more complex - which I love. The summing amp I have in mind has 12 inputs : 4 quadratures, KQO, Sq, circle, triangle, star, sqr wave generator and 2 extra. 8 summing...
    286 replies | 1067492 view(s)
  • Greg's Avatar
    11-05-2024, 03:53
    Here is the chopper driver card schematic from a package of documentation for the Mk4 received from John Tilp. My ability to read schematics is less advanced than some here, so I'm not sure exactly what the circuit described does. My understanding is that the chopper was a scanner, not a spinning...
    286 replies | 1067492 view(s)
  • laserist's Avatar
    11-04-2024, 13:30
    One thing about analog consoles is you tend to modify them over time. For example the output of the CYGN-B summed with the CYGN-A originally. Then it was added to Fixed Cycloid 7 & 9, Spiral & Inverse Spirals, and maybe the clipper. That was just up to when I left in 1984. Why not design giving...
    286 replies | 1067492 view(s)
  • Kevint's Avatar
    11-04-2024, 08:39
    Using the op amp wins. I will give it a try. Thank you all.
    286 replies | 1067492 view(s)
  • cfavreau's Avatar
    11-04-2024, 07:01
    Well at least you can use it somewhat. Do you or a friend have an oscilloscope? You can definitely troubleshoot some of it using that.
    3 replies | 1160 view(s)
  • thorcusmodee's Avatar
    11-04-2024, 02:01
    Yeah, same cable, I think the interface has gone faulty, I bought a dmx controller and can control the laser with that, although that is very limited compared to the ilda control. I guess i am going to have to spend some money, would love Pangolin but just can't justify the cash right now. Thanks...
    3 replies | 1160 view(s)
  • lasermaster1977's Avatar
    11-03-2024, 18:41
    Good point. With the TL084 keeping Rf above 2K should be fine with light loads ~10K.
    286 replies | 1067492 view(s)
  • Greg's Avatar
    11-03-2024, 18:35
    Greg replied to a thread CYGN-B in The Lounge
    Photo attached of the cinema where the show will take place in January.
    978 replies | 2949231 view(s)
  • Greg's Avatar
    11-03-2024, 18:25
    Greg replied to a thread CYGN-B in The Lounge
    Yes, just that. I hope our rarified community may thrive here for a long time to come. Just-in-case plans are usually good to have ahead of time though. I forget who the real benefactor of this site is. If said individual can PM me a name and address, I'll send a cheque for a few bucks.
    978 replies | 2949231 view(s)
  • laserist's Avatar
    11-03-2024, 18:12
    laserist replied to a thread CYGN-B in The Lounge
    The site has been down a fair amount. Greg has a sizable piece of his life invested here.
    978 replies | 2949231 view(s)
  • laserist's Avatar
    11-03-2024, 18:09
    Reducing the feedback resistor value rather than increasing the input resistor values could result in too much load on the output stage of the opamp. (Depending on the opamp...)
    286 replies | 1067492 view(s)
  • ronhip's Avatar
    11-03-2024, 16:26
    ronhip replied to a thread CYGN-B in The Lounge
    Greg, Is there some reason to believe that PL is going to disappear? I see nothing in the Admin News section. Ron
    978 replies | 2949231 view(s)
  • lasermaster1977's Avatar
    11-03-2024, 16:12
    Thanks for that Burr Brown clarification. My dyslexia seems to get worse in my old age. The key to the possible solutions is understanding the simple relationship of op amp's Rf / Rin ratios. The result can be >1 or <1. So laserist's suggestion is the best and simplest way to go. So, if...
    286 replies | 1067492 view(s)
  • Greg's Avatar
    11-03-2024, 12:51
    Greg replied to a thread CYGN-B in The Lounge
    As an emergency meeting site, in the event that photonlexicon.com has to be evacuated, may I offer the facebook page: Classic Laser Shows of the 1970s, 80s, and 90s All here are welcome to continue discussions related to lasers there if need be. I will post updates there for the show which at...
    978 replies | 2949231 view(s)
More Activity