Electronics > Beginners

Voltage controlled resistor options?

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Zero999:
If the lack of low value digital potentiometers is an issue, an op-amp can be used to divide it by a fixed value.·Note this circuit probably needs some frequency compensation and will need a low offset voltage op-amp. Figuring out how it works and what resistor ratios to use, is an exercise for the reader.

Ground_Loop:
How about a step motor operated ten turn pot

GerryR:

--- Quote from: Ground_Loop on February 14, 2020, 02:38:23 am ---How about a step motor operated ten turn pot

--- End quote ---

Good idea.  I had thought about mentioning a 10 (or 15 or 20) turn pot driven by a micro-stepper; you can get all the resolution you need, but I am unsure of the wattage available in those units.  Most of what I have used were 2 watts.

Vgkid:
What about making a precision dc load. Valhalla made some resistance calibrators that worked that way.

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