Laser Projector (Red, Green, Purple) "Laser 3D Party Light" from Spencer's

[DogP]

However on mine, modifying the diode drivers has not been easy. It uses a Pmos transistor to short the bias current as in your schematic. However mine is very sensitive to ground loops and almost any noise will turn the drivers on. Did you find a way to tame the sensitive FET for external modulation?

Hmm... I haven't had any problem driving the lasers through the connectors CN13, CN14, etc. Yours has FETs at Q1, Q2 and Q3 though?

I'm pretty sure mine has NPN BJTs (they're marked 1A, which should be a 3904 in a SOT-23 package). I can imagine a FET would be more sensitive to noise in that circuit... have you tried adding a pullup/down resistor? You could also swap them for something like: http://www.digikey.com/product-detai...FCT-ND/3504562 . Does your board look identical to mine?

DogP

[mixedgas]

Yep, P FETs. I tried switching to NPN but never achieved 100% blanking. Just so you know, its 4-5 mW of green, 8 mW of red, and 20 mW of 405 on mine. (plus a lot of IR) The amp is the same but my controller is a bit different in layout.

Steve

[Stiffler]

^ I have one, and it seems WAY brighter than 38 mw.

[mixedgas]

I used a NIST traceable silicon photometer with wavelength compensation. I like the white balance and the clean modulation on the green, so no adjusting upwards. This is for digitizing on trips, not for public consumption. Steve

[DogP]

Yep, P FETs. I tried switching to NPN but never achieved 100% blanking. Just so you know, its 4-5 mW of green, 8 mW of red, and 20 mW of 405 on mine. (plus a lot of IR) The amp is the same but my controller is a bit different in layout.

Steve

Hmm, so they're still tweaking the design... interesting! Maybe they'll come across this thread and fix their buggy code.

DogP

[tribble]

Steve, have you had a chance to do any galvo tuning on your copy? Interested to see what you can eke out of it.

I too have been buried in "real" work since the holidays ended... but I still check in here from time to time. Hope you are all doing well. :-)

Cheers,
Mike

[scoobydoobie]

Well, I thought I figured it out. But, alas I was wrong. It seems like it should be simple. I just need some letters too show up from the laser. LOL
I get the ild file made and try to open it with laser v1.0 that came with the laser and it crashes.
I would pay DSLI_JON too make the logo for me, but I attend one big car show a year and it's next weekend so my money is limited. His price was fair I just don't have it right now.
I don't suppose someone would have pity on me and make a .ctn file that says. "Flatline Customs" on top of "car & truck club"?
Doesn't have too be fancy at all.
Really bugs me I can't seem to get this figured out. lol
Thanks

[DogP]

I get the ild file made and try to open it with laser v1.0 that came with the laser and it crashes.
I would pay DSLI_JON too make the logo for me, but I attend one big car show a year and it's next weekend so my money is limited. His price was fair I just don't have it right now.
I don't suppose someone would have pity on me and make a .ctn file that says. "Flatline Customs" on top of "car & truck club"?

If you send me the file you made, I'd be glad to see if I can figure out what went wrong (I'll PM you my email address). Or, if you send me your club's logo in BMP, or a vector art file (so there are no compression artifacts), I'd be glad to try converting it (I searched your club online and found pictures of people w/ vinyl decals, but no good images of the logo). I can definitely get you some plain text, but that's boring.

I'm certainly no artist, or expert at this, but I like car clubs and car shows, and cool stuff like this definitely makes you stand out... so I like what you're trying to do. I used to be big into mini trucks (still have my S-10), though it's just a daily driver now.

Here's a pic of something I just whipped up... it's currently too many points, so it's pretty slow, but with some optimization, it could probably work (I just didn't want to spend much time on a fake logo). Capital letters would probably be easier to read as well.



DogP

[DogP]

Hey,

I was looking around for lasers for another project, and came across a direct green laser diode (PL-520), like: http://www.ebay.com/itm/Osram-PL-520...item27d516260f . I'm sure it's been discussed elsewhere on these forums, but I bring it up here, because it seems like an ideal candidate for one of these projectors, since it's probably too low power for most professionals (seems like ~100mW max), but perfect for a low power unit like this.

To run one of these diodes in this projector, it'd probably need a few modifications. First, it's a 3.8mm diode... I know the stock red and blue diodes are 5.6mm, and I believe the green is also. IIRC, tribble replaced his blue diode with a 3.8mm by replacing the housing and mounting it in the original heatsink... but the green heatsink is much larger, and I don't know if you could (easily) just replace the diode housing and reuse the heatsink/mount. Also, the voltage is a bit higher, so it may require either a modification to the circuit, or just replacing the driver completely. IIRC, the stock configuration will go up to 6.5V, which according to the datasheet will be ~100mA @ 20C, or ~150mA @ 40C, which looks to be ~30-50mW output (probably fine for me). Of course the current control would also need to be adjusted to the proper levels... and that secondary low current driver (which I don't think does anything anyway) could probably be removed.

Unfortunately, they're still pretty expensive... hopefully they'll drop in price soon (I'd be willing to spend ~$50 for a direct green laser, rather than DPSS... but at $115, that's a bit too much for me). What is the commercial usage of these diodes? Surely Osram isn't making a green diode just for fun, but it seems like it's too low power for one of those DLP projectors (maybe for micro projectors?).

DogP

[absolom7691]

...I'm sure it's been discussed elsewhere on these forums, but I bring it up here...

This is the thread you're looking for
http://www.photonlexicon.com/forums/...764#post257764

They are very sensitive to static so it would behoove you to get a lasorb for it, should you get one of these.

What is the commercial usage of these diodes?

The PDF spec sheet gives a few applications of use. Laser display is actually listed as one of them.... for once. http://www.dpss.ro/datasheets/PL_520_2012-10-23.pdf