[D.I.Y. tempco sensors]

[jh]

>Mike: Cool Idea. I don't see why the inductance would be a problem to you
>(unless you were thinking of using as op-amp feedback?).
>Heaven Help You (however) if the relay gets enough "juice" to energize and
>close the contacts... the inductance will change A LOT !!! 

Hey, you could even use this as automatic range switch for KFO action: Add another cap in the VCO if the CV gets too negative. 
Only joking, of course.

But the idea of using the copper for tempco is nice !

JH.