[sdiy] Stereo MOOG filter / sharing expo convertors

[Rutger Vlek]

That's a very interesting idea Paul, however I think it is hard to keep the 
distance between the frequencies stable across a the whole range, and for a 
good harmonic tuning it has to be, but it might be worth experimenting with!

Rutger

>From: "Paul Perry" <pfperry at melbpc.org.au>
>To: <Synth-diy at dropmix.xs4all.nl>
>Subject: RE: [sdiy] Stereo MOOG filter / sharing expo convertors
>Date: Thu, 10 May 2007 10:39:02 +1000
>
>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
>
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