Just a quick question regarding how one achieves the analogue RGB colour selection & blanking, & what combinations of Control Software & DAC work?
So the control software running on the laptop (e.g. Pangolin) generates the 'data' to control the laser & galvos, which is then passed to the external DAC via a USB lead?
The DAC then converts this data into analogue voltages of say 0v to +- 5v for each of the X & Y galvos? Presumably using some 8 bit DAC ICs. These voltages are passed to the projector via a standard ILDA connector/pin out? Somehow the R, G & B analogue modulation voltages of 0 to +5v for 0 to 100% are also present within this connector? Are there extra DACs present to generate these? ( Some laser modules e.g CNI from GoldenLasers appear to have strange modulation characteristics, like TTL signals running at 0 to 30kHz instead of the analogue 0 to +5vdc?).
These X & Y galvo & the RGB analogue modulation voltages pass to the projector, possibly going through an ILDA Break-Out Box, before being distributed to the galvo drive boards & the R, G & B laser modules?
Thus the control software on the laptop is in direct control of all aspects of the R, G & B intensity levels & the X & Y position of the galvo scanners?
If that is fundamentally the way things are done, what are the options for DAC & Control Software? The choice of these are the only components of the system that can vary, if everything downstream of the ILDA standard connector is built iaw the ILDA Standard Projector.
So examples I know of are Pangolin Quickshow running with their FB1 DAC, but there must be others, like LSX & Popelscan Control Software & RIYA, Norms & other DACs.
Just wondering how/what the combinations of Control Software & DACs are if I want to run blanked RGB graphics or multicoloured beam shows. Especially any freeware/open source or budget configurations, like this iShow I keep seeing on eBay!
Many thanks,
Simon B.