my new compact rgb build

[CDBEAM]

Very nice and very compact !!! I see you went with a two (2) level design....post and beam style construct !!
....and using threaded rods to connect the levels offers future modifiabillity !! And....many projector builders will likely modify or add colors like 640nm added to 658nm ....I know I am.....640nm at 500mw ordered !!!.... I put a drawing of the special base plate I will be using to marry the 658 Maxyz to the LW 640 in my gallery pics. This is one to do it. I am waiting on 640 delivery to completely verify head dimensions.....anyway...my point is that as technology goes foward....we will be tempted to upgrade/modify.
To anyone thinking about a projector build.....think about this possibillity.
CDBEAM

[badger1666]

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

there was more than just the notch filter one of the tuning pots has gone too along with a few minor component changes to clean up the output,in effect bill made an already good scan set better

[badger1666]

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

hi dan at the meet the green would only do <80mw and the beam went fat and tem01
and i could not get white now its all good and i am looking forward to the next meet

[buffo]

there was more than just the notch filter one of the tuning pots has gone too along with a few minor component changes to clean up the output,in effect bill made an already good scan set better

The removal of the hf damping was done later, when the driver itself was re-designed by Jian. That was not part of the "pangolin mod" that Pangolin was performing on the original scanners.

But yes, you are correct in that the idea to remove the HF damping control also originated from Bill Benner. By removing the HF damping, the tuning became extremely easy. However, I once tuned a set of the new DT-40's that Aaron had (before he bought his Kvant projector) and I found myself wishing that I still had the HF damping control.

Still, Bill's modifications to the DT-40 amps were much appreciated, and I agree that they made the scanners much better than they were. I wonder if he's had any input on the latest DT-40 wide-move scanner amps?

Adam

[badger1666]

hi all
found time today to do a little more got the chassis case kind of sorted just got to spay it
black , and fit it and find a camera filter to fit on front then job done
then get started on the next project (one a lot smaller )

[Spiltmidi]

@ hobbybob

,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.

chris

I have just purchased the same dt40pro's and seeing this has me wondering that I have purchased the wrong Scanners. Is this loss just with this scanner or are all scanners the same (unless purchasing more expensive scanners)?

Thanks in advance.

Very nice job with the projector aswell.

[badger1666]

oops that should have been dichro mirrors not galvo mirrors sorry will edit
but i do lose about 50mw total on the galvo mirrors but not to bad these days

[Spiltmidi]

Ah, that makes sense now. Lol

[badger1666]

well the case got a paint job , put the rest together and almost done just a camera filter to fit to the front
and finished
total size of projector 300mm wide 280mm deep 160mm high

[Carl B]

Very nice work there Chris.
when you go to get your window filter try to get a Sky Light one rather than a UV one. don't ask why but these seem to be most favored by people on PL.

Carl