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Running two projectors from one board

 

 


  Using a "Y-adapter" to run two projectors

  LASERSHOW DESIGNER
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  Running two projectors from one board
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Here are some questions regarding how to run two projectors from one QM2000 board. If you have further questions, please Contact Pangolin and we'll answer privately or here on the website

Question How do you take one LD2000 output, and run it to two different scan amps to play the same show on two remote scan heads? I know this is done at the conferences, even 3 heads are used sometimes. I cannot seem to find a Y-adapter to split the DB25 cable output. Radio Shack seems to think it is due to possible damage to either equipment. I have an A/B switching box, but would like to know the proper way to safely do this.

Pangolin user Matt Polak replies:

Answer I've had luck in simply splitting the connection with a standard-wired Y-splitter in the signal cable (just solder one up) and have not run into any major problems thus far. Mind you this was for rather short-haul applications. (The splitter was also handy in allowing me to plug an oscilloscope into the setup to program beam effects a little easier, especially during daylight hours!)
        On the more 'proper' way of doing things, the simplest solution is probably a buffering op-amp circuit (built from a few dollars of Radio Shack parts if you want to buy them locally). Doing it this way will give you the added bonus (if you include some potentiometers) to allow you to tweak your gain levels a bit if you ARE going for a long-haul over cable.
        Building the circuit with adjustability (and including the color channels, not just X/Y) also helps in allowing you to adjust the gain to your PCAOM color inputs, assuring that the signals are all 'hitting' their 100% mark down a long cable. It's a real pity to effectively lose laser output power due to signal loss in your cabling for whatever reason. Also, unless your PCAOM driver is perfectly tuned, you may not be getting absolutely 100% output potential from the crystal even with 'proper' signal levels going in. I know I've personally seen this, and I remember Michael Roberts also commenting a while back that his driver liked to see more like +6v or so to bring the lines fully on.
        In addition, even for standard applications, such a box with on-the-fly adjustable gains on each of the signal lines allows you to easily 'white-balance' the projector you're connected to without necessarily messing around with retraining your color palette. This is especially useful for tweaking ADAT playback and such, where there IS no palette to adjust. (It's also pretty much necessary if you're playing back from an ADAT without a CADAMOD or similar)

Pangolin's Bill Benner replies:

Answer Regarding your question of splitting the signal, Matt was essentially correct. This technique will work fine as long as high quality cable is used.

 

Click on picture for a larger view

Pangolin user Alberto Kellner replies:

Answer: Here is a picture using a classical output from a Pangolin LD2000 connected with two projectors. In this case, we used two 75 mW green diode laser projectors. This also works with multicolor lasers. We never had a problem.
     (Click on the photo for a larger view.)

 

Question Is it possible to split the serial output of the Lasershow Designer QM2000 card to run two separate projectors simultaneously off of one card, or will there be protocol problems? Has this been done to your knowledge?

Pangolin's Bill Benner replies:

Answer: It depends on what you mean by "serial output". Do you mean the analog output (X, Y, colors) which controls the graphics portion of the projector, or do you mean the DMX-512 output which can control lights, beam projectors and other accessories?
        If you are referring to the analog graphics output, it depends on the distance that needs to be driven. If the cables are relatively short, perhaps up to 50 feet each, and if you use high quality cable, then you should be able to take the analog signals and tie them to both cables. For longer cable lengths, it is desirable to have two separate distribution amplifiers to drive each cable segment.
        If you are referring to the DMX output, you definitely SHOULD NOT tie the output to two cables. DMX devices usually have an "input" and an "output" connector. If you have two devices, you connect the output of the QM2000 to the input of the first device, then connect the output of the first device to the input of the second device. With DMX, the total cable length can be up to 4000 feet so this generally should not be a problem.
  

   
  This page last updated: Monday, August 13, 2007 03:34 PM

 
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     Using multimedia in Showtime 2000
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