2 VCO's - 1 Log convertor (polysynth design)

[ld]

Along the same line, were the EML-101 4 vco's linear or expo? (1.2v/oct) how
many log converters?  I believe they did have at least one 726 heated pair
inside.

WeAreAs1 at aol.com wrote:

> In a message dated 5/25/99 6:53:19 AM, you wrote:
>
> <<what Im wondering is , does anyone know a way of driving 2 VCO's
> (usual ramp/square) from one log convertor>>
>
> One way to do it is the Korg method, as found in the PolySix and the Trident
> synths.  These units had just one exponential amp for all VCO's, but it was
> "time shared" by placing it inside a Mux/Demux circuit (using 4051's).
>
> The Trident had two VCO's per voice, and the PolySix had one.
>
> I'm pretty sure the PolySix schematics are somewhere out there on the web,
> but I don't know where.  You might try Tony Clark's DIY schematic archive.
>
> Juergen Haible could probably explain this circuit better than I - maybe
> he'll add some comments to clarify.
>
> Michael Bacich