Activity Stream

As is the some of the same stock from 2001... I don't visit that place anymore (I have enough junk already) but you can ask about crap before he scraps it all. Funny thread reading my last comment as I am now back in Aloha. If you need electronic stuff URS Electronics has been great for last...

STILL NO JOY! I built the circuit like Greg's and still not working. I got to be missing something basic. I'm confused with the FETs. On the LM schematic the gate of the FET goes to the output of the 555. On Greg's drawing the 555 signal goes to either a Source or Drain. I bought 2N3820...

Thanks laserist. Your explanation makes more sense. I never new PWM was also known as PDM or PLM.

Jeez I should have seen that. That's awesome. Thanks!

Different wikipedia article: Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period).

That's possible. Even probable. Though the wiki article seems to be talking about representing an analog signal using pulses, which as I see it is unrelated.

PDM enable came from X6 pin 22 on the effect maps it's refered to as SPIRAL DIRECTION/PDM EN.

Greg, I'm pretty sure PDM stands for Pulse-Density-Modulation which is a modulation form of an analog signal represented by a binary one. This could well makes sense in the context of the Laserium control electronics and methodologies. I'm pretty sure I'm right but it is a vague recollection in...

This scroll fragment found in the keep of Rondor concerns the ringing of the KQO. Hmm. Now I wonder which bit is the DMux bit which enables PDM? I never noticed that until now. My Summer Madness might be missing something important. By the way it appears that no one knows what PDM stands for.

Eidetic: Appropriate mourning music... Highland Cathedral: https://youtu.be/Yj_3scEyVoI?t=21 if you told the new fellow that Transverse Pumped Argons have insignificant and very poor high voltage Hold-off due to the ultra low pressure required, you would have had to explain the Penning...

I was thinking about that, they might be able to. Summation lasers are pretty far outside of my knowledge as far as theory of operation. I know they are power/temperature sensitive so, it's possible that it will work. I'll see how the flag method works. I would like to preserve as much power as...

There is another laser pointer forum now, it's laserdiscourse.org - no advertisements.

The flag will work just fine, and without the losses involved with 2 polarizers. Can the lasers handle pwm? A reasonably fast strobe won't hurt low speed lumia.

Looks like my time at LPF is finished, due to the butthurt weenie in charge. Guess he cares more for off-topic "fight club" posts and exerting whatever small control he has of things in his life than he cares for my contributions to the content over there. What a shame. Must be why nobody has...

Hello! Firstly, that's not my Youtube channel; absolutely nothing to do with me - he is a different Daniel *retardo Secondly, I don't think it's out of anything commercial, and absolutely nothing LSCP or similar. They don't use epoxy / hot-glue! It looks fully home-brew. Hats off to the guy...

Thinking about this a bit more - you don't really need to secure the second filter in a mount... You could stick it on the end of a short servo arm and just let it rotate through 90 degrees that way. (Assuming your filter was large enough, that is.) Adam

Thanks, Adam. I didn't even think about using polarizing filters. I'll most likely go down this route.

If you are OK with slower response, you can get completely adjustable attenuation using a pair of polarizing filters. Mount the first one in a fixed mount, and the other one in a rotating mount such that you can rotate it up to 90 degrees. Start out with both filters aligned in the same direction...

Wow! So he figured out how to detune the pump diode so the rod wouldn't shatter? That's really impressive! Damned shame that he isn't pursuing the project any longer. Those AMS units were good for up to 200 watts of green. And being DPSS, they would be a lot more reliable compared to the...

I know Kevin, thanks!

That would be Kevin @ Starlight... He didn't crack it, he designed a whole new controller. But I fear he's not doing that project any more. Steve

Greg. That's wonderful. At first glance it looks like I put the JFETs in backwards. I will try reversing them when I get off work. If that fails, I'll rebuild using your drawing. Fingers crossed.

Here are the wiring diagrams I drew for the KQO circuit, and a photo of one of my builds on breadboard. The spiral may be observed and tested without the clippers or symmetry, or the integrators which are an experiment seen in my breadboard build.

Note: in the photo, the output from the KQO goes directly to the clipper amps. I was testing by bypassing the symetry pot. The outputs of the KQO should go to the green and white wires attached to the dual pot. The test had no effect on the image.

HELP! Here is the image of the KQO image - at this moment it is trying very hard to do something but it's not a very happy circuit. I could really use some help troubleshooting. I triple checked the breadboard all looks good but I have to be missing something. The resistor R42 is getting...

Looks great Greg. Job well done.