[sdiy] 100k pot with switch questions

[Dan Snazelle]

i am stuimped

i am trying to setup a situation where an opamp can choose between (on one end) a 6k feedback gain resistor
OR a 100k gain pot. (preset gain or variable pot)


i also need to do a similar thing on the non inverting input with a switch bewtween a 100k voltage division pot to 
+/- V and a 41k resistor on one side and a 51 on the other.

(preset offset or variable offsett)

now, i wanted to do this without toggle switches to save panel space.

so i thought HEY i can just use my 100k pots that have built in switches!

however the problem is they are normally open.

it would be easy with normally closed.

BUT can anyone see a way to do it with normally open?

i hope i am explaining this properly.

basically i just want to switch between fixed resistor settings, and variable pot settings without using extra toggles for each.



thanks for any ideas or help.




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