LM331 for low frequency F to V

TonyWilk:
You'd have to give us a clue what circuit you are using the LM331 in. Since it's basically RC timing/filtering, just mentioning an R value makes no sense on its own.

Yours,
TonyWilk

Being a very popular IC like the 741 or 555 I thought a circuit is superfluous. Sorry. I am talking about the Rs resistor in the attached circuit...

LM331_FtoV.PNG