Originally Posted by
Bradfo69
One dead giveaway is that there is no DB25 ILDA connector on the back of the projector with the steppers. I'd say if there is a DB25, you can be pretty certain it has galvos. Steppers also can't really reproduce graphics of any quality so looking at the sample photos will often help with that. Plus in the specs it may make some reference to a number followed by Kpps and may list an angle such as @ 4 degrees. That will mean there are galvos.
.
As far as analog versus TTL you sometimes have to rely on them to tell you but, as a general rule, the price will tell you a whole lot of unspoken information. If it's a really inexpensive price, you can expect that it's TTL and perhaps steppers. Now... that's not "always" true. X-Laser (USA) is an example of a company that may have a higher priced projector that still is TTL but, that's somewhat intentional by design as, for the DJ market they're looking for maximum brightness and TTL can serve that purpose at the loss of more colors. But, it may have other features that make it a more expensive unit, such as being legal for use in the US.