I'd like to use a potentiometer (with a value like 1kOhm) in a resistor network to achieve a close to linear variation between 35 and 250 Ohm. I've tried several configurations, but I'm having a hard time finding a possible configuration.
R2 needs to be around 220 Ohm to allow this variation. Not only there aren't potentiometers with this values, as the response curve is very non-linear:
The response doesn't need to be super-linear, but needs to allow the user to vary it continuously.