Stab Frenzy wrote:
pflosi wrote:what i hate most about encoders it that it takes about 3 turns to sweep through the whole range. why doesnt anyone produce encoders that take 1 round for the whole range?
Rotary encoders work by having two switches, when you turn one way one switch closes and then the other one does, turn it the other direction and the second switch closes first, followed by the first one. Most rotary encoders have 30 or less 'clicks' per rotation so that the microprocessor that's scanning them doesn't miss a click when the knob's turned really quickly and get confused and start going backwards. You can put things like velocity sensing into the decoding so that turning the knob faster increments/decrements values more than one at a time but you still end up with more than one rotation to sweep values over their full range. I actually like that, because it makes it easier to get the exact value you want.
Not many these days are like that, Alpha dials (for data entry) yes but encoders, no. Some encoders do use a similar paradigm to that but use an optical wheel the same as old fashioned mice used to use instead of switches... Many optical encoders do have poor resolution though.
Most encoders these days are kinda like endless pots with a continuous contact... Many encoders use two or three of these contacts layered up but out of phase.
In the diagnostics on my Fusion, I can see that it is a three contact (called 'wiper' in the Fusion) type used for it's four encoder knobs.
Form the graphical display, I can see that wiper 1 is a linear type, going from 0 to 100% then immediately back to zero. Wiper 2 uses a triangle type waveform, going from 0 to 100% then back down to 0. Wiper 3 is the same as but about 90 degrees out of phase to wiper 2 IIRC.
As for synths which do sweep through the entire range in one turn (or less). My Fusion, EX7 and FS1R all do that... In fact, the encoders on my EX7 are marked as knobs and may be used as such depending on what operating mode you set them to... They even have a center detent!
The markings on the knobs are difficult to see but you should just about be able make them out in this pic.
Why some modern synths have stupid numbers of turns to do a full sweep is beyond me. There absolutely no excuse or need for it these days... Unless they're cutting corners of course.