After the last build it was only a matter of time until the family got extended by a big brother. Actually, planning started right after the Brick and this is more than a year ago. Because the project uses quite some custom items (and was changed because of the 445nm madness... hence the name MK2) it still isn’t completely finished but its time to share some photo’s
Just like last time the case was made using AutoCAD but now using a 30x25cm heat sink as base plate. This is only 5cm wider but the height of the case has decreased by 1cm so the other dimensions are 306x256x160mm
On one side there are 2 tapped holes for the clamps to mount it on a truss with the heat sink pointing down. When placement on a table is required its easy to remove the 2 clamps and small rubber pads are placed to avoid scratching
Comparing it with its little brother there isn’t changed too much. Most clear is the rotation of the heat sink and large aperture window for the DT40W’s
On the back all Neutrik connectors are mounted inside using countersunk screws.
Because it started to rain I quickly made the last photo so it isn’t very clear
Some picture’s of the inside during the build.
Ignore all the lose wires for now
So far the following components are mounted:
500mW green Viasho + Driver
1W blue module
Red driver (on top of the Viasho)
ControlPCB v1r1 (Old version, on top of the red driver)
DT40W’s + Drivers (Thanks Rob)
2x PSU
2x Neutrik XLR
1x Neutrik Powercon
1x ILDA pass-thru PCB
Currently I’m building the red module that is using 3x HL6385DG placed in a custom mount that’s also used for the blue module in combination with a prism pair. The power of the red module is a far to low compared with the other modules but this was a budget decision (we’re planning to build 6 RGB projectors… yes I know we're addicted) and in the pictures above you see a large reserved space for upgrades in the future. The mounts are cooled using a TEC with Die4Chill (Thanks Robin/Dave) the NTC is placed in a hole very close to the TEC (this is what the blue wires are for)
A special driver was designed for the blue diodes to combat the blue leak beam. Using this driver the diode glow is completely removed.
It also contains an onboard switching power supply to increase efficiency. Using a pot the drive voltage can be adjusted to Vop of the diode (this varies a lot between each diode)
This way the mosfet doesn't need to convert a lot of energy into heat.
Some of you might have seen this on MasterPJ's LEM.
For now I’m re-using the control PCB from the Bricks but a prototype of the next version (v2r0) is currently manufactured
If everything is working the way it should it add the following features
- Much more powerfull CPU
- 7 differential receivers for the colours
- Improved scanfail with higher resolution (for wide moves)
- Electronic X, Y, XY swap
- Isolated DMX control
- Ethernet interface
- Extra connections for keyswitch, remote interlock/start & buttons
- Expansion port for connecting stuff like a display
Movie of 2 bricks in action: http://www.photonlexicon.com/forums/...4-Wedding-show