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Re: How to automatically screw an adjustable resistor by motion?
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Buechsenschuetz
Jul 28, 2008, 6:10:14 AM7/28/08
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As you already have pointed out, the problem is the mechanical interface between a step motor drive and the adjustable resistor. Besides the problems with force applied to the resistor, you also have to make sure that the mechanical interface hits the slot of the adjustment screw precisely. The slot may be in different positions.
Anyhow, if you need to make adjustments automatically maybe an "electronic adjustable resistor" would be an option. The drawback is that these devices are no longer adjustable manually, i.e. with a screwdriver.
There are several manufacturers, Maxim has quite a wide range of these devices:
AnalogKid2DigitalMan
Jul 29, 2008, 12:10:18 PM7/29/08
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paulbin:
Can you post an image of the pot? There is a tool I have used in the past that is like a small screwdriver blade that is enclosed within a plastic nonconductive tube. The tube's ID is sized to the OD of the screw on the pot. You slip the tube over the screw and rotate and eventually the blade of the driver lines up with the slot in pot's screw.
-AK2DM
Can you post an image of the pot? There is a tool I have used in the past that is like a small screwdriver blade that is enclosed within a plastic nonconductive tube. The tube's ID is sized to the OD of the screw on the pot. You slip the tube over the screw and rotate and eventually the blade of the driver lines up with the slot in pot's screw.
-AK2DM
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