my new compact rgb build

[mikkojay]

Lookin' good man! Post some video when you get a chance...
-Mike

[badger1666]

after a bit of green laser trouble i finaly got full colour
here's a few crappy pics from my camera phone
all i need to make now is the case shell

[buffo]

Lookin' Good!

Adam

[hobbybob]

Is there a reason why you first add the blue and then add red ?
Won't this give you lots of transmission losses on the blue ?

[kl79]

nice build ! seems compact and clean !

[badger1666]

@ hobbybob

hi there is a reason they are put in this order and it all to do with how the eye percieves the brightness
of the lasers. i am not worried about the losses its about having all three match up for a good white without having to turn any of them down to get a good white and i wanted to make good use of the lasers i had.
i could be wrong about this though as i am no expert and i not to sure how to put it into words but will try
532nm appears brightest to the eye so i put my 200mw output green first ,the next closest wavelength is 473nm,so my 200mw output blue goes second,finaly my 300mw output 640 goes last,(as that the one we need the most power from to get a good match)
after all the losses i end up with a very good white without having to adjust any of them,
there is proberly a better technical way to explain all this but i dont know how to word it
some one like tocket could do,.
i will change my dichros to the new laserwave ones to reduce the losses a bit,but most of my loss comes from the galvo mirrors on my dt40pro's .across all the lasers i get a loss of 250mw not good, but it still balances out to a nice white
regards
chris

[hobbybob]

ok, thanks for explaining.
You also talk in the startpost about the DT40s having the pangolin mod done to them.
What is this mod ?

[bridge]

niceful pictures, good job, Chris.
Best regards!
Bridge

[danielbriggs]

Chris - looking good!
Your projector looked ace at the last meet, so whatever you've done with the green must make it look even more stunning
I really like the form factor of it - nice bit of engineering

[buffo]

You also talk about the DT40s having the pangolin mod done to them.
What is this mod ?

Bill Benner suggested that the notch filter be removed from the original DT-40 amp design, as it doesn't really effect the performance of the scanners that much, but it greatly complicates the tuning process. You simply remove the notch filter daughter board and solder across two pairs of pins on the underside of the main board, completely bypassing the circuit.

I did this to my original DT-40's, and they worked just as well without the notch filter installed. I ran them that way for nearly 2 years before selling the scanners.

The new DT-40 amps don't even have the notch filter daughter board anymore. It's been completely removed from the design.

Adam