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Old 05-18-2013, 10:52 AM #1
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Default How do ILDA laser projectors work?

Hello,

The past 2 days I've been really looking around on how to create an ILDA laser projector but it's really hard to find a clear technical explanation. I know how they work software wise but I'm still an amateur if it comes to the hardware part. I've not been able to find anything good on youtube, google or even the forums here.
My question is, what are the other components I need besides a laser module, ILDA galvo scanners, DAC and a sound card? Is there a guide on how I should put all of these together?

This maby is a question that has been asked a thousand times but I really can't find the answer. And I'm sure others will be able to learn a lot from this to.

Thanks in advance,
Bryzer



Last edited by Bryzer; 05-18-2013 at 12:13 PM.
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Old 05-19-2013, 12:29 AM #2
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Default Re: How do ILDA laser projectors work?

The ILDA standard just refers to a d-sub 25 connector pinout. The projector receives analog signals for X and Y positioning, and for each of the color intensities. There are a few other features that may or may not be used.

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Old 05-19-2013, 01:17 AM #3
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Default Re: How do ILDA laser projectors work?

Best way to answer your question is to look at pictures of other peoples builds. There isn't really a guide on how to make a laser projector, because they all differ. They can be as simple as a single laser and some galvos, or a 6 wavelength multi-FX beam table setup.

If your budget would allow, I would steer away from the soundcard DAC. Based on your avatar, I gather this might be used for events, and I don't think the soundcard would be stable enough to trust for something like that. Not to mention the lack of good software for it. I'd look at something like the Etherdream + LSX, or maybe a Pangolin FB3. Both will run you about $3-400 for the first, and around $500 for the latter.
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Old 05-19-2013, 12:32 PM #4
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Default Re: How do ILDA laser projectors work?

If I'm right the (soundcard) DAC is only used as an (low quality) converter? So instead of using a soundcard I could also use an DAC with storage functions like the one you listed am I right?
The thing is that it will be linked to a laptop with the supported laser software trough ILDA so I won't need a memory card or am I wrong on this one?

I'm going to make a sketch of how I think a projector works. It would be nice if someone here can correct the things I did wrong or maybe forgot.

-



How would the power supply work and what do I need for it?
I also got the feeling that I forgot something but I don't know what.. (don't mind the cooling system)

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Old 05-19-2013, 01:00 PM #5
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Default Re: How do ILDA laser projectors work?

Both of those will work fine off USB. Actually, I don't think the FB3 supports storing frames onboard anymore.

Which is better suited for you depends on what you're going to be using it for. If you're doing a lot of live stuff, where you just set up and go, I'd probably recommend the FB3, but if you're wanting to spend a lot of time, create shows etc, then I've heard good things about LSX. And not saying the FB3 isn't capable of shows, but LSX is aimed a bit more at the timeline side of things than the FB3, and on the other side, the FB3 is better for live stuff.

Last edited by Things; 05-19-2013 at 01:00 PM.
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Old 05-20-2013, 02:31 AM #6
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Default Re: How do ILDA laser projectors work?

All shows will be handmade and controlled using laser software, storage on the interface itself is not needed. Thanks

Last edited by Bryzer; 05-21-2013 at 08:42 PM.
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Old 05-21-2013, 08:43 PM #7
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Default Re: How do ILDA laser projectors work?

bump

Could someone tell if these circuits are right and if everything will be powered right when I use this circuit and if the ilda signal is right?

PC (ILDA) out -> ILDA in (DAC) -> galvo drivers -> galvo's
......................................... -> laser driver -> laser

Power supply (AC 230V -> DC 24V@10A) -> DC convertor (3-40V -> 15V / less then 1A) -> galvo drivers (DC +15V@1A / -15V@0.6A) -> Galvo's
.................................................. .....-> DC convertor (3-40V -> 12V / less then 1A) -> laser driver -> laser (DC 12V@?A)

Links to ebay:
Power supply
DC convertor
Galvo set
Laser module

Please note that I've never ever assembled a electronic device before besides my computer and I didn't really had to work with power convertors for that one...

Last edited by Bryzer; 05-21-2013 at 08:44 PM.
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Old 05-21-2013, 09:45 PM #8
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Default Re: How do ILDA laser projectors work?

PC->DAC-ILDA->Galvo Drivers
->Laser Drivers


Quote:
Originally Posted by Bryzer View Post
bump

Could someone tell if these circuits are right and if everything will be powered right when I use this circuit and if the ilda signal is right?

PC (ILDA) out -> ILDA in (DAC) -> galvo drivers -> galvo's
......................................... -> laser driver -> laser

Power supply (AC 230V -> DC 24V@10A) -> DC convertor (3-40V -> 15V / less then 1A) -> galvo drivers (DC +15V@1A / -15V@0.6A) -> Galvo's
.................................................. .....-> DC convertor (3-40V -> 12V / less then 1A) -> laser driver -> laser (DC 12V@?A)

Links to ebay:
Power supply
DC convertor
Galvo set
Laser module

Please note that I've never ever assembled a electronic device before besides my computer and I didn't really had to work with power convertors for that one...
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Old 05-22-2013, 04:52 PM #9
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Default Re: How do ILDA laser projectors work?

Is everything else right?
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Old 05-22-2013, 05:36 PM #10
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Default Re: How do ILDA laser projectors work?

Quote:
Originally Posted by Bryzer View Post
Is everything else right?
pangolin published a very good article on projector wiring. this may help clarify things for you:

Laser Show Resource Guide - Projector Connections article - Pangolin Laser Systems
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Old 06-22-2013, 11:55 PM #11
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Default Re: How do ILDA laser projectors work?

connect your x/y dac to scanner driver board, and connect your r+/g+/b+ and ground to r/g/b laser module, it will work as you want. that is to say: pin 1 and 2 to scanner x and y, and pin 5/6/7 to r+/g+/b+
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Old 06-23-2013, 11:32 AM #12
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Default Re: How do ILDA laser projectors work?

What I miss in your setup is the show card.

The galvo drivers will be connected to the show card.
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