At 10:40 AM 3/6/2010, Tom Hargrave wrote: >The fact that the carbon resistor is laser trimmed is what I was eluding to >when I stated that relocating the wiper isn't a 100% fix. The problem is >that the missing carbon track across the carbon resistor changes the value >all the way across the sweep even when you relocate the wiper. Dear Tom, I'd like to see that tested. There has to be some reason that they made the thing so elaborate, and I strongly suspect that it's to reduce the sensitivity of the device to the precise tracking radius of the wiper. Remember that it's acting as a potentiometer and its output is a smoothly varying voltage; but if you measure wiper-to-ground resistance while moving the vane it varies all over the place. I wish I had one to do some measurements on. My impression is that the large carbon surface contributes comparatively little to the resistance. Yours, David |
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