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Old 08-09-2012, 11:46 PM #1
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Default Low-cost RGB Scanner

Searching around the web for people's creations and parts, I've found many different approaches to making a scanner. What I need from you guys is feedback on whether or not you think my idea would work.

So I want to build a RGB scanner using:
  • Soundboard DAC
  • Correction amp
  • 50mW 532nm Green Laser
  • 200mW 650nm Red Laser
  • 1W 445nm Blue Laser
  • Dichros to combine the lasers

I was thinking of using stepper motors instead of galvos, due to the price of galvos.

Any and all feedback is appreciated.
Thanks!


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Old 08-10-2012, 12:26 AM #2
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Default Re: Low-cost RGB Scanner

Stepper motors will result in a flickering image similar to low speed galvos.
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Old 08-10-2012, 12:52 AM #3
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Default Re: Low-cost RGB Scanner

Are you sure? It seems like others have have success with stepper motors.

Last edited by lmnotran; 08-10-2012 at 12:52 AM.
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Old 08-10-2012, 01:52 AM #4
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Default Re: Low-cost RGB Scanner

Steppers do work.. slowly and awkwardly compared to galvos, but they do work. That said, IMO you will quickly regret going with steppers over galvos. Then you'll spring for the galvos, which will mean you're in for the cost of both the steppers and galvos. I'd just save up for the galvos.
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Old 08-10-2012, 02:00 AM #5
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Default Re: Low-cost RGB Scanner

Ahhh. I'll probably save up for galvos then! Do you know where I can find some entry-level galvos that aren't too expensive?
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Old 08-10-2012, 02:01 AM #6
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Default Re: Low-cost RGB Scanner

I'm not sure about the colors ration though. You won't get many color combinations with this setup.
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Old 08-10-2012, 02:04 AM #7
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Default Re: Low-cost RGB Scanner

What wavelengths and powers do you recommend?
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Old 08-10-2012, 02:25 AM #8
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Default Re: Low-cost RGB Scanner

i cant really remember how much red and blue you need compared to green. I think for red you need twice the green and for blue too. Lasers with adjustable powers is the way to go for full RGB . I'm not really into projector stuff yet though. Others know better.
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Old 08-10-2012, 02:26 AM #9
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Default Re: Low-cost RGB Scanner

RGB: 2:1:2 gives a great white. You can almost never have too much red though..
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Old 08-10-2012, 02:32 AM #10
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Default Re: Low-cost RGB Scanner

2:1:2 eh? I'll try that haha. I'm probably gonna end up buying overpowered lasers and lowering the max power of each laser. It's always better to have more than you need.
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Old 08-10-2012, 03:36 AM #11
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Default Re: Low-cost RGB Scanner

Any advice on the DAC or software?
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Old 08-10-2012, 03:42 AM #12
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Default Re: Low-cost RGB Scanner

Have you done, ANY research?

There are threads here telling you exactly step by step, how to set up a DAC for scanner use. Maybe buy one of those??

If you wanna do this on the cheap its not gonna be anywhere near what you see on videos. Just be aware of that... If you're gonna go cheapskate on it.. you may as well buy a REKE and be done with it.

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Last edited by bobhaha; 08-10-2012 at 03:42 AM.
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Old 08-10-2012, 03:48 AM #13
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Default Re: Low-cost RGB Scanner

I know i'm sacrificing quality for price. See, this thread was mainly for a low-cost "support scanner" that i'm gonna be using in addition to a higher quality, "main scanner", mainly because I want a REALLY wide spread.
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Old 08-10-2012, 03:56 AM #14
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Default Re: Low-cost RGB Scanner

Have you looked into the REKE series? They are cheap and nasty... but they work... and they're cheap!
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10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!
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