[sdiy] 100k pot with switch questions

[Tom Bugs]

Possibly use an electronic switch IC?
eg. 4051/2/3 or 4016/4066 or some DG4** type switch if you need bipolar 
voltages.
I've never used pots with switches so I may be way off!

Dan Snazelle wrote:
> 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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>
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