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I became interested in microcontrollers a while ago and I am considering a DIY sync sound motor for my Kinor 2m camera. I also have other cameras which could use a stable speed motor (for example my 35mm Soyuz-US3N camera and the rheostat motored Konvas 1KCP. This is because there is no available motors of any kind for Soyuz and the rheostat Konvas never had any sync motors made originally) . I started with the 16mm Kinor motor last month and I'm refining the analog control electronics and fine tuning the code now. I was just thinking, is there lots of people out there who could use a customisable sync sound motor on their camera and if so, which exact camera models would be the most in demand? If there seems to be some common interests then I could take them into account when developing my own motor project and it might be easy to make custom solutions for other persons cameras as well. --------- What would be the absolutely mandatory specifications for this type of motor? I am aiming for +/- 10rpm accuracy at the moment but we will see how accurate the diy solution will be when it is fine tuned for the specific motor and camera model. That 10rpm accuracy would be about 1 frame drift for every 2.5 minutes of footage shot which should be usable for sync sound uses in indie films which have relatively short takes (a minute per take for example). My current design for the Kinor16 motor will have 6 different preset speeds and it uses the original pilot tone generator just like the Olex crystal sync modification does though my design is not as sophisticated or accurate (one gets what one pays for :) the Olex motor is better and my design is cheaper). - what type of camera and "wild" motor would most urgently need a digital speed stabilising system like this one? - how accurate the speed needs to be. how much it can drift to be usable? I am talking about minimum specs which would enable practical use of the system, NOT about how much would be nice to have :) - how much it can cost, in case there seems to be so much demand that it would be doable to do for example a dozen or so of these? - how much the end user can assemble by themselves? is a parts kit with pre drilled circuit board enough (needs soldering and a little bit of tuning) or only fully assembled board would do? - it is very clear from beginning that this type of product needs to be user installed to be a viable option. It would not be economical to ship cameras and motors back and forth between continents, that would ruin the whole point of this type of motor solution - what kind of inputs for the encoder which is attached to the motor. My current design uses the pilot tone generator signal coming from the Kinor motor but for other cameras I will use either a encoder disc or magnetic sensors for rpm feedback.