04-06-2012, 01:16 PM
First, let me say that I do realise that what I am about to suggest is not exactly what you are looking for, but it may be of interest to others faced with a similar problem of producing a rotary, variable resistor that has a law that is not readily available. However, if you get really desperate, it might just be worth considering.
With a 10-way, single-pole rotary switch, you can choose the resistors that sit between each fixed contact so that you can achieve an approximation to any law. The downside is, of course, that the resistance is not continuously variable: it changes in steps. However, if you do have something rare and unusual - such as a 20-way rotary switch - you obviously get a finer resolution . . . and so on. Moreover, with a double-wafer switch, you are then equipped for 'stereo' or an exotic control where the 'law' of each 'track' can be quite different from each other. A test equipment requirement springs to mind at that point.
Just a thought.
Al.
With a 10-way, single-pole rotary switch, you can choose the resistors that sit between each fixed contact so that you can achieve an approximation to any law. The downside is, of course, that the resistance is not continuously variable: it changes in steps. However, if you do have something rare and unusual - such as a 20-way rotary switch - you obviously get a finer resolution . . . and so on. Moreover, with a double-wafer switch, you are then equipped for 'stereo' or an exotic control where the 'law' of each 'track' can be quite different from each other. A test equipment requirement springs to mind at that point.
Just a thought.
Al.
