[sdiy] Stereo MOOG filter / sharing expo convertors

[Paul Perry]

Following on, is there a simple way to generate a current that is a fixed
ratio of another current? (you can see where I'm going with this... one exp
converter to control two harmonically related frequencies, for example).
I think at the silicon level it is done using transistors with ratios of
area (I could of course be completely wrong about that).

Paul perry Melbourne Australia

-----Original Message-----

Using one current source with multiple 
transistors should work wery well. I'd use
a monolythic transistor array, like a CA3046
(for low cost) or a MAT-04 for better matching.
They should track excellently, imho.
H^) harry