Along with the j4cDAC, I've been working on my first projector build, and it's now getting pretty close to done...
More photos of the case here.
It's tiny - 6" by 8" by a bit over 3". Inside is a "200mW" green pointer core from eBay, two LOCs, a blue diode, a set of PT-30k galvos, and a j4cDAC.
Here's what it looked like before I built a case around it:
The driver board is three simple opamp-and-BJT high side CCSes, plus a TI buck converter module to provide a 6.5v rail for the diodes from the main 24v power supply. I built it from scratch on some perfboard.
There is no mains inside the projector. A small laptop-type power supply provide the main +24v supply, which powers the diode driver board, DAC, and galvo drivers. Additionally, a DC-DC converter provides the -24v galvo supply. This lets me keep most of the PSU bulk encapsulated and saves a lot of space. I'd really like a galvo driver board that drives the galvo coil push-pull with an H-bridge arrangement from one rail, but oh well.
There's a cutout in the bottom of the baseplate to facilitate messing with the mirror adjustment screws. It's covered with a piece of plastic in the assembled projector.
Here's a closeup of the diode module. The LOC diodes are in dave's mounts, modified for isolation (I posted a thread about it). Green is in a cut-out clamp, and blue is in an unmodified dave mount. The PBS was provided by swamidog, and comes from a LaserDisc player. (Swami, I still owe you some mirror mounts. Thanks!)
Most of the construction photos are a bit old. I've flattened out the lasorb assemblies and diode wiring, so the highest point off the baseplate is now the edge of the galvo drivers and the connectors on the j4cDAC.
The thread would not be complete without photos of light coming out of it. Here are some beam shots in fog -
And, last night we got some video of it running dchammonds' abstract generator:
http://www.youtube.com/watch?v=3sMZIQU8SiQ
Now I'm debating spending some cash on a 637nm diode...