Modulation in BEYOND

[White-Light]

I took a look at the board supplied by Stanwax. It looks as if he will be out of town for the next week. In any case this looks straightforward, however I'm wondering are the adjustments useful primarily for the DPSS. Do the direct diode lasers such as the 445/645 operate identically and do not need to be tuned relative to each other?

My understanding is that you tune all the lasers down to the speed of the slowest laser so that they all modulate up and down exactly together.

The Stanwax instructions are here and will probably give you a better insight:

http://www.stanwax.plus.com/lw/colourboard%20ins.pdf

[DZ]

I'm curious, I just got back a color board I loaned out a while ago, I have no use for and I'm not interested in selling it, but would anyone be interested in "borrowing" it to test out? Kind of a try before you buy thing. I would just ask for $10 or $15 to cover shipping and effort, you use it for ~30 days and send it back. This color board is in it's own enclosure with an ILDA in and out connector. Just attach 110VAC, open the box and adjust the pots.



Ok, just throwing this out there since this thread went in the direction of color boards!

/threadjack

[dnar]

Hmmm. Well considering I am already using a StanWax ILDA board, it makes sense to go the "whole hog". I ordered a colour board from Stan, or was it Loretta?

[White-Light]

I'm curious, I just got back a color board I loaned out a while ago, I have no use for and I'm not interested in selling it, but would anyone be interested in "borrowing" it to test out? Kind of a try before you buy thing. I would just ask for $10 or $15 to cover shipping and effort, you use it for ~30 days and send it back. This color board is in it's own enclosure with an ILDA in and out connector. Just attach 110VAC, open the box and adjust the pots.



Ok, just throwing this out there since this thread went in the direction of color boards!

/threadjack

I never thought about doing that but it also looks like a great way of getting around problems of insufficient room in the projector case.

I always supposed you to had to intercept the signals internally but obviously from your external design it doesn't matter where they're intercepted and delayed.

[planters]

It's my thread, and I'll talk about color boards if I want to. These seam to be the answer to modulation variations between the various lasers used in projectors. However, if the result is that the faster lasers are being slowed to match the slowest laser( if the result is this simple) then it seems like the DPSS models are really dragging down the 100kHz diodes and the very expensive OPSS lasers. I'm not criticizing the boards, rather wondering if this is a significant argument against DPSS when there is a choice?

[mixedgas]

Paraphrasing Leslie Gore:

"Its my thread and I'll cry if I want to, crryyyy if I want to, Crryyy if I want to"

So Sorry, Could not resist.



Planters, the color correction boards are shaped analog filters, using phase delay to correct the color.
Its a few op-amps, and the tuning is um, touchy, if your not used to adjusting things. Pseudo log response using diodes in the circuit corrects for linearity.

They really are a "band-aid". It is a low cost, and in most cases, highly effective band aid.

They work well, but the down side is no two systems match.

I hate to harken back to the days of external modulation, where this problem could be minimized, but that is the other way to go.

Put a quality large crystal AOM on the output side of the dye laser.

The red diodes are reasonably close to linear, the blue diodes are not at low currents.

Blue diodes could go into a analog light feedback loop, or you could use the color corrector card.

Steve

[allthatwhichis]

Someone needs to invent a 5W Ar/Kr mixed gas laser that runs off of 110V @ 5A and only needs passive cooling...

[LaNeK779]

110 or 220 volts (in case you travel)

and make that single fase, please

ps. dreams are free, rite?

[dnar]

Oooooo. My Stanwax colour correction board arrived today. Nice.

The question is, do I want to fit it before my gig on Saturday? Do I feel lucky?

[planters]

I'd say go for it. If I understand it, if it doesn't work/ no difference or is just to finicky then take it out and your back to baseline. No changes to the projector, scanners or drivers because it just inserts midstream, right? Right?