Upside Down

[kel19700]

Hi All,

A couple of questions

1 Does anyone know of any reason why you cant operate a 800mw RGB projector upside down.

2 Does anyone know why my projector is projecting upside down.

When running in stand alone mode its fine but as soon as i connect to the Moncha box and control through the software it turns upside down.

I can change the position on the output settings in Moncha, but should i have to each time i load new frames.

Kel

[mixedgas]

If your projector has standard galvos, flip the differential signal wires to the "Y" galvo. There will be three wires to the galvo amp, ground Y+ and Y-. Interchange Y+ and Y-. If your galvo amp only has two wires for single ended signaling, you need a inverter circuit.

Steve

[taggalucci]

I can operate my projectors upside down. One of them is ~3,000mW. Though I designed them in this way.

The issue with some specific projectors is that they may rely on heat rising to cool. If the projector's upside down, this could affect it.

[FutureWeapons]

If your projector has standard galvos, flip the differential signal wires to the "Y" galvo. There will be three wires to the galvo amp, ground Y+ and Y-. Interchange Y+ and Y-. If your galvo amp only has two wires for single ended signaling, you need a inverter circuit.

Steve

Can you point me toward a good guide to doing this? Also, is there an "all-purpose" inverter circuit you would recommend, or are they more specific? I've got a couple cheap lasers that are upside down (that I invert in the software) but this sounds like a really good first project to embark on.

[LaNeK779]

well, the easiest thing to do would be what mixed gas proposes above. just flip the y+ / y- signal wires. nice and easy, no danger to your lasers etc etc

if you still need a kit or a board for this, check out the one below, by mr stanwax http://shop.stanwaxlaser.co.uk/ds3-family-353-p.asp

it has axis flips and some more stuff

[Stoney3K]

Your show software doesn't allow you to flip the image through a simple 'Flip X' or 'Flip Y' button?

A simple inverter circuit can be made with a pair of DPDT switches though.

[taggalucci]

A simple inverter circuit can be made with a pair of DPDT switches though.

Just be careful doing this for the Y axis if you have a "hot" overhead zone and attenuated beams into the audience. Bumping a switch could result in hot beams now heading right into the audience. If you want to flip Y axis with a switch, you could use a DPDT keyswitch.

Here's a quick n dirty DPDT Axis Flip Switch Wiring...

           ,------- OUT 1
           |
IN+ ----o  o  o
        |     |
        |  ,--'
        '--+--.
        ,--'  |
        |     |
IN- ----o  o  o
           |
           '------- OUT 2

Using a standard DPDT toggle switch, the ILDA X/Y positive (IN+) from the DB-25 connector is soldered to one side of the switch and the ILDA X/Y negative (IN-) from the DB-25 connector to the other side. Insulated wires from each of these first soldered points are crossed over each other in the middle and soldered to the diagonally opposite points. Two wires are soldered to the central points (OUT 1 and 2) these then attach to the scanner amp inputs from ILDA X/Y + and - (in either order). Flipping the switch then flips the image in that axis.