# How do I alter the resistance floor of a potentiometer without shifting the entire range?

Assume I have a linear potentiometer that, say, has a range of 0 to 10Kohm. Then assume that:

0deg = 0 ohms

10deg = 370 ohms

270deg = 10Kohm

My question is, how do I show 370 ohms while the potentiometer is ≤ 10 degrees, but as soon as it gets > 10 degrees, ONLY the potentiometer value is shown (e.g. 11deg would show about 407 ohms)? That is, IGNORE the potentiometer when it is ≤ 10 degrees, but then continue as normal past 10 degrees.

I could do it with an active design, but was wondering if there was a way to do it with just passive components that for some reason I'm not seeing..

Note that the reason this has to be done with external components (rather than just change the potentiometer range to be 370-10K) is that the additional floor needs to be switchable.

• XY problem #1 Aug 8 '17 at 19:35
• Edit your question to explain what the real problem is rather than what your solution is. There may be a much simpler solution. There's a schematic button on the editor toolbar. A schematic saves many words and much guessing on our part. Aug 8 '17 at 19:40
• I think you'd better spend more time talking about what all this is getting used for.
– jonk
Aug 8 '17 at 19:40
• pots usually unreliable for absolute value in low % just before 0, so this is a poor assumption Aug 9 '17 at 1:49
• Are you just outputting a voltage with the pot? If yes, then that's easier to design for (output some fixed voltage for the first 10 degrees of rotation). Or do you really need Ohms (as in resistance that stays at 370 Ohms for the 10 degrees)? Aug 10 '17 at 6:05