tempcos, PTC or NTC

[Rene Schmitz]

>1) in the feed back loop of the opamp (this is very common)

PTC 

>2) in the bottom of the divider chain on the output of the opamp
>    (equally as common as 1)

PTC 

>3) in the top of the divider chain on the output of the opamp
>    (vary rare)

NTC (Look at the VCO6 at my website for an example)

>  what I want know is Which do you need for *EACH* of the
>above three methods PTC or NTC?

Bye
 René

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